linux-stable/net/6lowpan/debugfs.c
Greg Kroah-Hartman db50450d09 6lowpan: no need to check return value of debugfs_create functions
When calling debugfs functions, there is no need to ever check the
return value.  The function can work or not, but the code logic should
never do something different based on this.

Because we don't care if debugfs works or not, this trickles back a bit
so we can clean things up by making some functions return void instead
of an error value that is never going to fail.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2019-07-06 12:50:01 +02:00

277 lines
6.7 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
*
* Authors:
* (C) 2015 Pengutronix, Alexander Aring <aar@pengutronix.de>
* Copyright (c) 2015 Nordic Semiconductor. All Rights Reserved.
*/
#include <net/6lowpan.h>
#include "6lowpan_i.h"
#define LOWPAN_DEBUGFS_CTX_PFX_NUM_ARGS 8
static struct dentry *lowpan_debugfs;
static int lowpan_ctx_flag_active_set(void *data, u64 val)
{
struct lowpan_iphc_ctx *ctx = data;
if (val != 0 && val != 1)
return -EINVAL;
if (val)
set_bit(LOWPAN_IPHC_CTX_FLAG_ACTIVE, &ctx->flags);
else
clear_bit(LOWPAN_IPHC_CTX_FLAG_ACTIVE, &ctx->flags);
return 0;
}
static int lowpan_ctx_flag_active_get(void *data, u64 *val)
{
*val = lowpan_iphc_ctx_is_active(data);
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(lowpan_ctx_flag_active_fops,
lowpan_ctx_flag_active_get,
lowpan_ctx_flag_active_set, "%llu\n");
static int lowpan_ctx_flag_c_set(void *data, u64 val)
{
struct lowpan_iphc_ctx *ctx = data;
if (val != 0 && val != 1)
return -EINVAL;
if (val)
set_bit(LOWPAN_IPHC_CTX_FLAG_COMPRESSION, &ctx->flags);
else
clear_bit(LOWPAN_IPHC_CTX_FLAG_COMPRESSION, &ctx->flags);
return 0;
}
static int lowpan_ctx_flag_c_get(void *data, u64 *val)
{
*val = lowpan_iphc_ctx_is_compression(data);
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(lowpan_ctx_flag_c_fops, lowpan_ctx_flag_c_get,
lowpan_ctx_flag_c_set, "%llu\n");
static int lowpan_ctx_plen_set(void *data, u64 val)
{
struct lowpan_iphc_ctx *ctx = data;
struct lowpan_iphc_ctx_table *t =
container_of(ctx, struct lowpan_iphc_ctx_table, table[ctx->id]);
if (val > 128)
return -EINVAL;
spin_lock_bh(&t->lock);
ctx->plen = val;
spin_unlock_bh(&t->lock);
return 0;
}
static int lowpan_ctx_plen_get(void *data, u64 *val)
{
struct lowpan_iphc_ctx *ctx = data;
struct lowpan_iphc_ctx_table *t =
container_of(ctx, struct lowpan_iphc_ctx_table, table[ctx->id]);
spin_lock_bh(&t->lock);
*val = ctx->plen;
spin_unlock_bh(&t->lock);
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(lowpan_ctx_plen_fops, lowpan_ctx_plen_get,
lowpan_ctx_plen_set, "%llu\n");
static int lowpan_ctx_pfx_show(struct seq_file *file, void *offset)
{
struct lowpan_iphc_ctx *ctx = file->private;
struct lowpan_iphc_ctx_table *t =
container_of(ctx, struct lowpan_iphc_ctx_table, table[ctx->id]);
spin_lock_bh(&t->lock);
seq_printf(file, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
be16_to_cpu(ctx->pfx.s6_addr16[0]),
be16_to_cpu(ctx->pfx.s6_addr16[1]),
be16_to_cpu(ctx->pfx.s6_addr16[2]),
be16_to_cpu(ctx->pfx.s6_addr16[3]),
be16_to_cpu(ctx->pfx.s6_addr16[4]),
be16_to_cpu(ctx->pfx.s6_addr16[5]),
be16_to_cpu(ctx->pfx.s6_addr16[6]),
be16_to_cpu(ctx->pfx.s6_addr16[7]));
spin_unlock_bh(&t->lock);
return 0;
}
static int lowpan_ctx_pfx_open(struct inode *inode, struct file *file)
{
return single_open(file, lowpan_ctx_pfx_show, inode->i_private);
}
static ssize_t lowpan_ctx_pfx_write(struct file *fp,
const char __user *user_buf, size_t count,
loff_t *ppos)
{
char buf[128] = {};
struct seq_file *file = fp->private_data;
struct lowpan_iphc_ctx *ctx = file->private;
struct lowpan_iphc_ctx_table *t =
container_of(ctx, struct lowpan_iphc_ctx_table, table[ctx->id]);
int status = count, n, i;
unsigned int addr[8];
if (copy_from_user(&buf, user_buf, min_t(size_t, sizeof(buf) - 1,
count))) {
status = -EFAULT;
goto out;
}
n = sscanf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x",
&addr[0], &addr[1], &addr[2], &addr[3], &addr[4],
&addr[5], &addr[6], &addr[7]);
if (n != LOWPAN_DEBUGFS_CTX_PFX_NUM_ARGS) {
status = -EINVAL;
goto out;
}
spin_lock_bh(&t->lock);
for (i = 0; i < 8; i++)
ctx->pfx.s6_addr16[i] = cpu_to_be16(addr[i] & 0xffff);
spin_unlock_bh(&t->lock);
out:
return status;
}
static const struct file_operations lowpan_ctx_pfx_fops = {
.open = lowpan_ctx_pfx_open,
.read = seq_read,
.write = lowpan_ctx_pfx_write,
.llseek = seq_lseek,
.release = single_release,
};
static void lowpan_dev_debugfs_ctx_init(struct net_device *dev,
struct dentry *ctx, u8 id)
{
struct lowpan_dev *ldev = lowpan_dev(dev);
struct dentry *root;
char buf[32];
WARN_ON_ONCE(id > LOWPAN_IPHC_CTX_TABLE_SIZE);
sprintf(buf, "%d", id);
root = debugfs_create_dir(buf, ctx);
debugfs_create_file("active", 0644, root, &ldev->ctx.table[id],
&lowpan_ctx_flag_active_fops);
debugfs_create_file("compression", 0644, root, &ldev->ctx.table[id],
&lowpan_ctx_flag_c_fops);
debugfs_create_file("prefix", 0644, root, &ldev->ctx.table[id],
&lowpan_ctx_pfx_fops);
debugfs_create_file("prefix_len", 0644, root, &ldev->ctx.table[id],
&lowpan_ctx_plen_fops);
}
static int lowpan_context_show(struct seq_file *file, void *offset)
{
struct lowpan_iphc_ctx_table *t = file->private;
int i;
seq_printf(file, "%3s|%-43s|%c\n", "cid", "prefix", 'C');
seq_puts(file, "-------------------------------------------------\n");
spin_lock_bh(&t->lock);
for (i = 0; i < LOWPAN_IPHC_CTX_TABLE_SIZE; i++) {
if (!lowpan_iphc_ctx_is_active(&t->table[i]))
continue;
seq_printf(file, "%3d|%39pI6c/%-3d|%d\n", t->table[i].id,
&t->table[i].pfx, t->table[i].plen,
lowpan_iphc_ctx_is_compression(&t->table[i]));
}
spin_unlock_bh(&t->lock);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(lowpan_context);
static int lowpan_short_addr_get(void *data, u64 *val)
{
struct wpan_dev *wdev = data;
rtnl_lock();
*val = le16_to_cpu(wdev->short_addr);
rtnl_unlock();
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(lowpan_short_addr_fops, lowpan_short_addr_get, NULL,
"0x%04llx\n");
static void lowpan_dev_debugfs_802154_init(const struct net_device *dev,
struct lowpan_dev *ldev)
{
struct dentry *root;
if (!lowpan_is_ll(dev, LOWPAN_LLTYPE_IEEE802154))
return;
root = debugfs_create_dir("ieee802154", ldev->iface_debugfs);
debugfs_create_file("short_addr", 0444, root,
lowpan_802154_dev(dev)->wdev->ieee802154_ptr,
&lowpan_short_addr_fops);
}
void lowpan_dev_debugfs_init(struct net_device *dev)
{
struct lowpan_dev *ldev = lowpan_dev(dev);
struct dentry *contexts;
int i;
/* creating the root */
ldev->iface_debugfs = debugfs_create_dir(dev->name, lowpan_debugfs);
contexts = debugfs_create_dir("contexts", ldev->iface_debugfs);
debugfs_create_file("show", 0644, contexts, &lowpan_dev(dev)->ctx,
&lowpan_context_fops);
for (i = 0; i < LOWPAN_IPHC_CTX_TABLE_SIZE; i++)
lowpan_dev_debugfs_ctx_init(dev, contexts, i);
lowpan_dev_debugfs_802154_init(dev, ldev);
}
void lowpan_dev_debugfs_exit(struct net_device *dev)
{
debugfs_remove_recursive(lowpan_dev(dev)->iface_debugfs);
}
void __init lowpan_debugfs_init(void)
{
lowpan_debugfs = debugfs_create_dir("6lowpan", NULL);
}
void lowpan_debugfs_exit(void)
{
debugfs_remove_recursive(lowpan_debugfs);
}