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![Takashi Iwai](/assets/img/avatar_default.png)
snd_info_get_line() has a sanity check of NULL buffer -- both buffer itself being NULL and buffer->buffer being NULL. Basically both checks are valid and necessary, but the problem is that it's with snd_BUG_ON() macro that triggers WARN_ON(). The latter condition (NULL buffer->buffer) can be met arbitrarily by user since the buffer is allocated at the first write, so it means that user can trigger WARN_ON() at will. This patch addresses it by simply moving buffer->buffer NULL check out of snd_BUG_ON() so that spurious WARNING is no longer triggered. Reported-by: syzbot+e42d0746c3c3699b6061@syzkaller.appspotmail.com Cc: <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20200717084023.5928-1-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
914 lines
20 KiB
C
914 lines
20 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Information interface for ALSA driver
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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*/
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#include <linux/init.h>
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#include <linux/time.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/module.h>
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#include <sound/core.h>
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#include <sound/minors.h>
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#include <sound/info.h>
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#include <linux/utsname.h>
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#include <linux/proc_fs.h>
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#include <linux/mutex.h>
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#include <stdarg.h>
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int snd_info_check_reserved_words(const char *str)
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{
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static const char * const reserved[] =
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{
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"version",
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"meminfo",
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"memdebug",
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"detect",
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"devices",
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"oss",
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"cards",
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"timers",
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"synth",
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"pcm",
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"seq",
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NULL
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};
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const char * const *xstr = reserved;
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while (*xstr) {
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if (!strcmp(*xstr, str))
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return 0;
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xstr++;
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}
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if (!strncmp(str, "card", 4))
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return 0;
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return 1;
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}
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static DEFINE_MUTEX(info_mutex);
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struct snd_info_private_data {
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struct snd_info_buffer *rbuffer;
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struct snd_info_buffer *wbuffer;
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struct snd_info_entry *entry;
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void *file_private_data;
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};
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static int snd_info_version_init(void);
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static void snd_info_disconnect(struct snd_info_entry *entry);
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/*
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*/
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static struct snd_info_entry *snd_proc_root;
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struct snd_info_entry *snd_seq_root;
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EXPORT_SYMBOL(snd_seq_root);
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#ifdef CONFIG_SND_OSSEMUL
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struct snd_info_entry *snd_oss_root;
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#endif
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static int alloc_info_private(struct snd_info_entry *entry,
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struct snd_info_private_data **ret)
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{
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struct snd_info_private_data *data;
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if (!entry || !entry->p)
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return -ENODEV;
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if (!try_module_get(entry->module))
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return -EFAULT;
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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (!data) {
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module_put(entry->module);
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return -ENOMEM;
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}
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data->entry = entry;
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*ret = data;
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return 0;
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}
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static bool valid_pos(loff_t pos, size_t count)
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{
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if (pos < 0 || (long) pos != pos || (ssize_t) count < 0)
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return false;
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if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos)
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return false;
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return true;
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}
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/*
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* file ops for binary proc files
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*/
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static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig)
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{
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struct snd_info_private_data *data;
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struct snd_info_entry *entry;
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loff_t ret = -EINVAL, size;
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data = file->private_data;
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entry = data->entry;
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mutex_lock(&entry->access);
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if (entry->c.ops->llseek) {
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offset = entry->c.ops->llseek(entry,
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data->file_private_data,
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file, offset, orig);
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goto out;
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}
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size = entry->size;
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switch (orig) {
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case SEEK_SET:
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break;
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case SEEK_CUR:
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offset += file->f_pos;
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break;
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case SEEK_END:
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if (!size)
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goto out;
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offset += size;
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break;
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default:
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goto out;
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}
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if (offset < 0)
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goto out;
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if (size && offset > size)
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offset = size;
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file->f_pos = offset;
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ret = offset;
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out:
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mutex_unlock(&entry->access);
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return ret;
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}
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static ssize_t snd_info_entry_read(struct file *file, char __user *buffer,
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size_t count, loff_t * offset)
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{
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struct snd_info_private_data *data = file->private_data;
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struct snd_info_entry *entry = data->entry;
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size_t size;
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loff_t pos;
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pos = *offset;
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if (!valid_pos(pos, count))
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return -EIO;
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if (pos >= entry->size)
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return 0;
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size = entry->size - pos;
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size = min(count, size);
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size = entry->c.ops->read(entry, data->file_private_data,
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file, buffer, size, pos);
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if ((ssize_t) size > 0)
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*offset = pos + size;
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return size;
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}
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static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer,
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size_t count, loff_t * offset)
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{
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struct snd_info_private_data *data = file->private_data;
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struct snd_info_entry *entry = data->entry;
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ssize_t size = 0;
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loff_t pos;
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pos = *offset;
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if (!valid_pos(pos, count))
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return -EIO;
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if (count > 0) {
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size_t maxsize = entry->size - pos;
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count = min(count, maxsize);
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size = entry->c.ops->write(entry, data->file_private_data,
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file, buffer, count, pos);
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}
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if (size > 0)
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*offset = pos + size;
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return size;
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}
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static __poll_t snd_info_entry_poll(struct file *file, poll_table *wait)
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{
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struct snd_info_private_data *data = file->private_data;
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struct snd_info_entry *entry = data->entry;
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__poll_t mask = 0;
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if (entry->c.ops->poll)
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return entry->c.ops->poll(entry,
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data->file_private_data,
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file, wait);
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if (entry->c.ops->read)
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mask |= EPOLLIN | EPOLLRDNORM;
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if (entry->c.ops->write)
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mask |= EPOLLOUT | EPOLLWRNORM;
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return mask;
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}
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static long snd_info_entry_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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struct snd_info_private_data *data = file->private_data;
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struct snd_info_entry *entry = data->entry;
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if (!entry->c.ops->ioctl)
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return -ENOTTY;
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return entry->c.ops->ioctl(entry, data->file_private_data,
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file, cmd, arg);
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}
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static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma)
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{
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struct inode *inode = file_inode(file);
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struct snd_info_private_data *data;
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struct snd_info_entry *entry;
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data = file->private_data;
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if (data == NULL)
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return 0;
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entry = data->entry;
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if (!entry->c.ops->mmap)
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return -ENXIO;
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return entry->c.ops->mmap(entry, data->file_private_data,
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inode, file, vma);
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}
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static int snd_info_entry_open(struct inode *inode, struct file *file)
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{
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struct snd_info_entry *entry = PDE_DATA(inode);
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struct snd_info_private_data *data;
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int mode, err;
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mutex_lock(&info_mutex);
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err = alloc_info_private(entry, &data);
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if (err < 0)
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goto unlock;
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mode = file->f_flags & O_ACCMODE;
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if (((mode == O_RDONLY || mode == O_RDWR) && !entry->c.ops->read) ||
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((mode == O_WRONLY || mode == O_RDWR) && !entry->c.ops->write)) {
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err = -ENODEV;
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goto error;
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}
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if (entry->c.ops->open) {
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err = entry->c.ops->open(entry, mode, &data->file_private_data);
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if (err < 0)
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goto error;
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}
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file->private_data = data;
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mutex_unlock(&info_mutex);
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return 0;
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error:
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kfree(data);
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module_put(entry->module);
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unlock:
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mutex_unlock(&info_mutex);
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return err;
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}
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static int snd_info_entry_release(struct inode *inode, struct file *file)
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{
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struct snd_info_private_data *data = file->private_data;
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struct snd_info_entry *entry = data->entry;
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if (entry->c.ops->release)
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entry->c.ops->release(entry, file->f_flags & O_ACCMODE,
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data->file_private_data);
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module_put(entry->module);
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kfree(data);
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return 0;
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}
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static const struct proc_ops snd_info_entry_operations =
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{
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.proc_lseek = snd_info_entry_llseek,
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.proc_read = snd_info_entry_read,
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.proc_write = snd_info_entry_write,
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.proc_poll = snd_info_entry_poll,
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.proc_ioctl = snd_info_entry_ioctl,
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.proc_mmap = snd_info_entry_mmap,
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.proc_open = snd_info_entry_open,
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.proc_release = snd_info_entry_release,
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};
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/*
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* file ops for text proc files
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*/
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static ssize_t snd_info_text_entry_write(struct file *file,
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const char __user *buffer,
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size_t count, loff_t *offset)
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{
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struct seq_file *m = file->private_data;
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struct snd_info_private_data *data = m->private;
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struct snd_info_entry *entry = data->entry;
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struct snd_info_buffer *buf;
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loff_t pos;
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size_t next;
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int err = 0;
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if (!entry->c.text.write)
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return -EIO;
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pos = *offset;
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if (!valid_pos(pos, count))
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return -EIO;
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next = pos + count;
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/* don't handle too large text inputs */
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if (next > 16 * 1024)
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return -EIO;
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mutex_lock(&entry->access);
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buf = data->wbuffer;
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if (!buf) {
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data->wbuffer = buf = kzalloc(sizeof(*buf), GFP_KERNEL);
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if (!buf) {
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err = -ENOMEM;
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goto error;
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}
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}
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if (next > buf->len) {
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char *nbuf = kvzalloc(PAGE_ALIGN(next), GFP_KERNEL);
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if (!nbuf) {
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err = -ENOMEM;
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goto error;
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}
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kvfree(buf->buffer);
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buf->buffer = nbuf;
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buf->len = PAGE_ALIGN(next);
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}
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if (copy_from_user(buf->buffer + pos, buffer, count)) {
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err = -EFAULT;
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goto error;
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}
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buf->size = next;
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error:
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mutex_unlock(&entry->access);
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if (err < 0)
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return err;
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*offset = next;
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return count;
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}
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static int snd_info_seq_show(struct seq_file *seq, void *p)
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{
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struct snd_info_private_data *data = seq->private;
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struct snd_info_entry *entry = data->entry;
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if (!entry->c.text.read) {
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return -EIO;
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} else {
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data->rbuffer->buffer = (char *)seq; /* XXX hack! */
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entry->c.text.read(entry, data->rbuffer);
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}
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return 0;
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}
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static int snd_info_text_entry_open(struct inode *inode, struct file *file)
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{
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struct snd_info_entry *entry = PDE_DATA(inode);
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struct snd_info_private_data *data;
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int err;
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mutex_lock(&info_mutex);
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err = alloc_info_private(entry, &data);
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if (err < 0)
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goto unlock;
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data->rbuffer = kzalloc(sizeof(*data->rbuffer), GFP_KERNEL);
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if (!data->rbuffer) {
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err = -ENOMEM;
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goto error;
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}
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if (entry->size)
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err = single_open_size(file, snd_info_seq_show, data,
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entry->size);
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else
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err = single_open(file, snd_info_seq_show, data);
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if (err < 0)
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goto error;
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mutex_unlock(&info_mutex);
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return 0;
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error:
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kfree(data->rbuffer);
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kfree(data);
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module_put(entry->module);
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unlock:
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mutex_unlock(&info_mutex);
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return err;
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}
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static int snd_info_text_entry_release(struct inode *inode, struct file *file)
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{
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struct seq_file *m = file->private_data;
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struct snd_info_private_data *data = m->private;
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struct snd_info_entry *entry = data->entry;
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if (data->wbuffer && entry->c.text.write)
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entry->c.text.write(entry, data->wbuffer);
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single_release(inode, file);
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kfree(data->rbuffer);
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if (data->wbuffer) {
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kvfree(data->wbuffer->buffer);
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kfree(data->wbuffer);
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}
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module_put(entry->module);
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kfree(data);
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return 0;
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}
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static const struct proc_ops snd_info_text_entry_ops =
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{
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.proc_open = snd_info_text_entry_open,
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.proc_release = snd_info_text_entry_release,
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.proc_write = snd_info_text_entry_write,
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.proc_lseek = seq_lseek,
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.proc_read = seq_read,
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};
|
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|
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static struct snd_info_entry *create_subdir(struct module *mod,
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const char *name)
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{
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struct snd_info_entry *entry;
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entry = snd_info_create_module_entry(mod, name, NULL);
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if (!entry)
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return NULL;
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entry->mode = S_IFDIR | 0555;
|
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if (snd_info_register(entry) < 0) {
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snd_info_free_entry(entry);
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return NULL;
|
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}
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return entry;
|
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}
|
|
|
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static struct snd_info_entry *
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snd_info_create_entry(const char *name, struct snd_info_entry *parent,
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struct module *module);
|
|
|
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int __init snd_info_init(void)
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|
{
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snd_proc_root = snd_info_create_entry("asound", NULL, THIS_MODULE);
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|
if (!snd_proc_root)
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return -ENOMEM;
|
|
snd_proc_root->mode = S_IFDIR | 0555;
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snd_proc_root->p = proc_mkdir("asound", NULL);
|
|
if (!snd_proc_root->p)
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|
goto error;
|
|
#ifdef CONFIG_SND_OSSEMUL
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|
snd_oss_root = create_subdir(THIS_MODULE, "oss");
|
|
if (!snd_oss_root)
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|
goto error;
|
|
#endif
|
|
#if IS_ENABLED(CONFIG_SND_SEQUENCER)
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|
snd_seq_root = create_subdir(THIS_MODULE, "seq");
|
|
if (!snd_seq_root)
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|
goto error;
|
|
#endif
|
|
if (snd_info_version_init() < 0 ||
|
|
snd_minor_info_init() < 0 ||
|
|
snd_minor_info_oss_init() < 0 ||
|
|
snd_card_info_init() < 0 ||
|
|
snd_info_minor_register() < 0)
|
|
goto error;
|
|
return 0;
|
|
|
|
error:
|
|
snd_info_free_entry(snd_proc_root);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
int __exit snd_info_done(void)
|
|
{
|
|
snd_info_free_entry(snd_proc_root);
|
|
return 0;
|
|
}
|
|
|
|
static void snd_card_id_read(struct snd_info_entry *entry,
|
|
struct snd_info_buffer *buffer)
|
|
{
|
|
struct snd_card *card = entry->private_data;
|
|
|
|
snd_iprintf(buffer, "%s\n", card->id);
|
|
}
|
|
|
|
/*
|
|
* create a card proc file
|
|
* called from init.c
|
|
*/
|
|
int snd_info_card_create(struct snd_card *card)
|
|
{
|
|
char str[8];
|
|
struct snd_info_entry *entry;
|
|
|
|
if (snd_BUG_ON(!card))
|
|
return -ENXIO;
|
|
|
|
sprintf(str, "card%i", card->number);
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|
entry = create_subdir(card->module, str);
|
|
if (!entry)
|
|
return -ENOMEM;
|
|
card->proc_root = entry;
|
|
|
|
return snd_card_ro_proc_new(card, "id", card, snd_card_id_read);
|
|
}
|
|
|
|
/*
|
|
* register the card proc file
|
|
* called from init.c
|
|
* can be called multiple times for reinitialization
|
|
*/
|
|
int snd_info_card_register(struct snd_card *card)
|
|
{
|
|
struct proc_dir_entry *p;
|
|
int err;
|
|
|
|
if (snd_BUG_ON(!card))
|
|
return -ENXIO;
|
|
|
|
err = snd_info_register(card->proc_root);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (!strcmp(card->id, card->proc_root->name))
|
|
return 0;
|
|
|
|
if (card->proc_root_link)
|
|
return 0;
|
|
p = proc_symlink(card->id, snd_proc_root->p, card->proc_root->name);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
card->proc_root_link = p;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* called on card->id change
|
|
*/
|
|
void snd_info_card_id_change(struct snd_card *card)
|
|
{
|
|
mutex_lock(&info_mutex);
|
|
if (card->proc_root_link) {
|
|
proc_remove(card->proc_root_link);
|
|
card->proc_root_link = NULL;
|
|
}
|
|
if (strcmp(card->id, card->proc_root->name))
|
|
card->proc_root_link = proc_symlink(card->id,
|
|
snd_proc_root->p,
|
|
card->proc_root->name);
|
|
mutex_unlock(&info_mutex);
|
|
}
|
|
|
|
/*
|
|
* de-register the card proc file
|
|
* called from init.c
|
|
*/
|
|
void snd_info_card_disconnect(struct snd_card *card)
|
|
{
|
|
if (!card)
|
|
return;
|
|
mutex_lock(&info_mutex);
|
|
proc_remove(card->proc_root_link);
|
|
card->proc_root_link = NULL;
|
|
if (card->proc_root)
|
|
snd_info_disconnect(card->proc_root);
|
|
mutex_unlock(&info_mutex);
|
|
}
|
|
|
|
/*
|
|
* release the card proc file resources
|
|
* called from init.c
|
|
*/
|
|
int snd_info_card_free(struct snd_card *card)
|
|
{
|
|
if (!card)
|
|
return 0;
|
|
snd_info_free_entry(card->proc_root);
|
|
card->proc_root = NULL;
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* snd_info_get_line - read one line from the procfs buffer
|
|
* @buffer: the procfs buffer
|
|
* @line: the buffer to store
|
|
* @len: the max. buffer size
|
|
*
|
|
* Reads one line from the buffer and stores the string.
|
|
*
|
|
* Return: Zero if successful, or 1 if error or EOF.
|
|
*/
|
|
int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len)
|
|
{
|
|
int c;
|
|
|
|
if (snd_BUG_ON(!buffer))
|
|
return 1;
|
|
if (!buffer->buffer)
|
|
return 1;
|
|
if (len <= 0 || buffer->stop || buffer->error)
|
|
return 1;
|
|
while (!buffer->stop) {
|
|
c = buffer->buffer[buffer->curr++];
|
|
if (buffer->curr >= buffer->size)
|
|
buffer->stop = 1;
|
|
if (c == '\n')
|
|
break;
|
|
if (len > 1) {
|
|
len--;
|
|
*line++ = c;
|
|
}
|
|
}
|
|
*line = '\0';
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(snd_info_get_line);
|
|
|
|
/**
|
|
* snd_info_get_str - parse a string token
|
|
* @dest: the buffer to store the string token
|
|
* @src: the original string
|
|
* @len: the max. length of token - 1
|
|
*
|
|
* Parses the original string and copy a token to the given
|
|
* string buffer.
|
|
*
|
|
* Return: The updated pointer of the original string so that
|
|
* it can be used for the next call.
|
|
*/
|
|
const char *snd_info_get_str(char *dest, const char *src, int len)
|
|
{
|
|
int c;
|
|
|
|
while (*src == ' ' || *src == '\t')
|
|
src++;
|
|
if (*src == '"' || *src == '\'') {
|
|
c = *src++;
|
|
while (--len > 0 && *src && *src != c) {
|
|
*dest++ = *src++;
|
|
}
|
|
if (*src == c)
|
|
src++;
|
|
} else {
|
|
while (--len > 0 && *src && *src != ' ' && *src != '\t') {
|
|
*dest++ = *src++;
|
|
}
|
|
}
|
|
*dest = 0;
|
|
while (*src == ' ' || *src == '\t')
|
|
src++;
|
|
return src;
|
|
}
|
|
EXPORT_SYMBOL(snd_info_get_str);
|
|
|
|
/*
|
|
* snd_info_create_entry - create an info entry
|
|
* @name: the proc file name
|
|
* @parent: the parent directory
|
|
*
|
|
* Creates an info entry with the given file name and initializes as
|
|
* the default state.
|
|
*
|
|
* Usually called from other functions such as
|
|
* snd_info_create_card_entry().
|
|
*
|
|
* Return: The pointer of the new instance, or %NULL on failure.
|
|
*/
|
|
static struct snd_info_entry *
|
|
snd_info_create_entry(const char *name, struct snd_info_entry *parent,
|
|
struct module *module)
|
|
{
|
|
struct snd_info_entry *entry;
|
|
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
|
|
if (entry == NULL)
|
|
return NULL;
|
|
entry->name = kstrdup(name, GFP_KERNEL);
|
|
if (entry->name == NULL) {
|
|
kfree(entry);
|
|
return NULL;
|
|
}
|
|
entry->mode = S_IFREG | 0444;
|
|
entry->content = SNDRV_INFO_CONTENT_TEXT;
|
|
mutex_init(&entry->access);
|
|
INIT_LIST_HEAD(&entry->children);
|
|
INIT_LIST_HEAD(&entry->list);
|
|
entry->parent = parent;
|
|
entry->module = module;
|
|
if (parent) {
|
|
mutex_lock(&parent->access);
|
|
list_add_tail(&entry->list, &parent->children);
|
|
mutex_unlock(&parent->access);
|
|
}
|
|
return entry;
|
|
}
|
|
|
|
/**
|
|
* snd_info_create_module_entry - create an info entry for the given module
|
|
* @module: the module pointer
|
|
* @name: the file name
|
|
* @parent: the parent directory
|
|
*
|
|
* Creates a new info entry and assigns it to the given module.
|
|
*
|
|
* Return: The pointer of the new instance, or %NULL on failure.
|
|
*/
|
|
struct snd_info_entry *snd_info_create_module_entry(struct module * module,
|
|
const char *name,
|
|
struct snd_info_entry *parent)
|
|
{
|
|
if (!parent)
|
|
parent = snd_proc_root;
|
|
return snd_info_create_entry(name, parent, module);
|
|
}
|
|
EXPORT_SYMBOL(snd_info_create_module_entry);
|
|
|
|
/**
|
|
* snd_info_create_card_entry - create an info entry for the given card
|
|
* @card: the card instance
|
|
* @name: the file name
|
|
* @parent: the parent directory
|
|
*
|
|
* Creates a new info entry and assigns it to the given card.
|
|
*
|
|
* Return: The pointer of the new instance, or %NULL on failure.
|
|
*/
|
|
struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card,
|
|
const char *name,
|
|
struct snd_info_entry * parent)
|
|
{
|
|
if (!parent)
|
|
parent = card->proc_root;
|
|
return snd_info_create_entry(name, parent, card->module);
|
|
}
|
|
EXPORT_SYMBOL(snd_info_create_card_entry);
|
|
|
|
static void snd_info_disconnect(struct snd_info_entry *entry)
|
|
{
|
|
struct snd_info_entry *p;
|
|
|
|
if (!entry->p)
|
|
return;
|
|
list_for_each_entry(p, &entry->children, list)
|
|
snd_info_disconnect(p);
|
|
proc_remove(entry->p);
|
|
entry->p = NULL;
|
|
}
|
|
|
|
/**
|
|
* snd_info_free_entry - release the info entry
|
|
* @entry: the info entry
|
|
*
|
|
* Releases the info entry.
|
|
*/
|
|
void snd_info_free_entry(struct snd_info_entry * entry)
|
|
{
|
|
struct snd_info_entry *p, *n;
|
|
|
|
if (!entry)
|
|
return;
|
|
if (entry->p) {
|
|
mutex_lock(&info_mutex);
|
|
snd_info_disconnect(entry);
|
|
mutex_unlock(&info_mutex);
|
|
}
|
|
|
|
/* free all children at first */
|
|
list_for_each_entry_safe(p, n, &entry->children, list)
|
|
snd_info_free_entry(p);
|
|
|
|
p = entry->parent;
|
|
if (p) {
|
|
mutex_lock(&p->access);
|
|
list_del(&entry->list);
|
|
mutex_unlock(&p->access);
|
|
}
|
|
kfree(entry->name);
|
|
if (entry->private_free)
|
|
entry->private_free(entry);
|
|
kfree(entry);
|
|
}
|
|
EXPORT_SYMBOL(snd_info_free_entry);
|
|
|
|
static int __snd_info_register(struct snd_info_entry *entry)
|
|
{
|
|
struct proc_dir_entry *root, *p = NULL;
|
|
|
|
if (snd_BUG_ON(!entry))
|
|
return -ENXIO;
|
|
root = entry->parent == NULL ? snd_proc_root->p : entry->parent->p;
|
|
mutex_lock(&info_mutex);
|
|
if (entry->p || !root)
|
|
goto unlock;
|
|
if (S_ISDIR(entry->mode)) {
|
|
p = proc_mkdir_mode(entry->name, entry->mode, root);
|
|
if (!p) {
|
|
mutex_unlock(&info_mutex);
|
|
return -ENOMEM;
|
|
}
|
|
} else {
|
|
const struct proc_ops *ops;
|
|
if (entry->content == SNDRV_INFO_CONTENT_DATA)
|
|
ops = &snd_info_entry_operations;
|
|
else
|
|
ops = &snd_info_text_entry_ops;
|
|
p = proc_create_data(entry->name, entry->mode, root,
|
|
ops, entry);
|
|
if (!p) {
|
|
mutex_unlock(&info_mutex);
|
|
return -ENOMEM;
|
|
}
|
|
proc_set_size(p, entry->size);
|
|
}
|
|
entry->p = p;
|
|
unlock:
|
|
mutex_unlock(&info_mutex);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* snd_info_register - register the info entry
|
|
* @entry: the info entry
|
|
*
|
|
* Registers the proc info entry.
|
|
* The all children entries are registered recursively.
|
|
*
|
|
* Return: Zero if successful, or a negative error code on failure.
|
|
*/
|
|
int snd_info_register(struct snd_info_entry *entry)
|
|
{
|
|
struct snd_info_entry *p;
|
|
int err;
|
|
|
|
if (!entry->p) {
|
|
err = __snd_info_register(entry);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
list_for_each_entry(p, &entry->children, list) {
|
|
err = snd_info_register(p);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(snd_info_register);
|
|
|
|
/**
|
|
* snd_card_rw_proc_new - Create a read/write text proc file entry for the card
|
|
* @card: the card instance
|
|
* @name: the file name
|
|
* @private_data: the arbitrary private data
|
|
* @read: the read callback
|
|
* @write: the write callback, NULL for read-only
|
|
*
|
|
* This proc file entry will be registered via snd_card_register() call, and
|
|
* it will be removed automatically at the card removal, too.
|
|
*/
|
|
int snd_card_rw_proc_new(struct snd_card *card, const char *name,
|
|
void *private_data,
|
|
void (*read)(struct snd_info_entry *,
|
|
struct snd_info_buffer *),
|
|
void (*write)(struct snd_info_entry *entry,
|
|
struct snd_info_buffer *buffer))
|
|
{
|
|
struct snd_info_entry *entry;
|
|
|
|
entry = snd_info_create_card_entry(card, name, card->proc_root);
|
|
if (!entry)
|
|
return -ENOMEM;
|
|
snd_info_set_text_ops(entry, private_data, read);
|
|
if (write) {
|
|
entry->mode |= 0200;
|
|
entry->c.text.write = write;
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(snd_card_rw_proc_new);
|
|
|
|
/*
|
|
|
|
*/
|
|
|
|
static void snd_info_version_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
|
|
{
|
|
snd_iprintf(buffer,
|
|
"Advanced Linux Sound Architecture Driver Version k%s.\n",
|
|
init_utsname()->release);
|
|
}
|
|
|
|
static int __init snd_info_version_init(void)
|
|
{
|
|
struct snd_info_entry *entry;
|
|
|
|
entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL);
|
|
if (entry == NULL)
|
|
return -ENOMEM;
|
|
entry->c.text.read = snd_info_version_read;
|
|
return snd_info_register(entry); /* freed in error path */
|
|
}
|