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mei: debugfs: adjust active clients print buffer

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In case of many active host clients clients (41 and more) 1K buffer
is not enough for full information print.
Calculate buffer size according to real clients number.

Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexander Usyskin 2016-02-07 23:35:17 +02:00 committed by Greg Kroah-Hartman
parent a96c548291
commit 2690025482
1 changed files with 24 additions and 9 deletions
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33
drivers/misc/mei/debugfs.c
View file

@ -50,6 +50,7 @@ static ssize_t mei_dbgfs_read_meclients(struct file *fp, char __user *ubuf,
}
pos += scnprintf(buf + pos, bufsz - pos, HDR);
#undef HDR
/* if the driver is not enabled the list won't be consistent */
if (dev->dev_state != MEI_DEV_ENABLED)
@ -90,24 +91,38 @@ static ssize_t mei_dbgfs_read_active(struct file *fp, char __user *ubuf,
{
struct mei_device *dev = fp->private_data;
struct mei_cl *cl;
const size_t bufsz = 1024;
size_t bufsz = 1;
char *buf;
int i = 0;
int pos = 0;
int ret;
#define HDR " |me|host|state|rd|wr|\n"
if (!dev)
return -ENODEV;
buf = kzalloc(bufsz, GFP_KERNEL);
if (!buf)
return -ENOMEM;
pos += scnprintf(buf + pos, bufsz - pos,
" |me|host|state|rd|wr|\n");
mutex_lock(&dev->device_lock);
/*
* if the driver is not enabled the list won't be consistent,
* we output empty table
*/
if (dev->dev_state == MEI_DEV_ENABLED)
list_for_each_entry(cl, &dev->file_list, link)
bufsz++;
bufsz *= sizeof(HDR) + 1;
buf = kzalloc(bufsz, GFP_KERNEL);
if (!buf) {
mutex_unlock(&dev->device_lock);
return -ENOMEM;
}
pos += scnprintf(buf + pos, bufsz - pos, HDR);
#undef HDR
/* if the driver is not enabled the list won't be consistent */
if (dev->dev_state != MEI_DEV_ENABLED)
goto out;
@ -115,7 +130,7 @@ static ssize_t mei_dbgfs_read_active(struct file *fp, char __user *ubuf,
list_for_each_entry(cl, &dev->file_list, link) {
pos += scnprintf(buf + pos, bufsz - pos,
"%2d|%2d|%4d|%5d|%2d|%2d|\n",
"%3d|%2d|%4d|%5d|%2d|%2d|\n",
i, mei_cl_me_id(cl), cl->host_client_id, cl->state,
!list_empty(&cl->rd_completed), cl->writing_state);
i++;