korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-30 07:34:12 +08:00
Code Issues Packages Projects Releases Wiki Activity

[media] media: em28xx - fix i2c_xfer to return -ENODEV when dev is removed

Browse Source 
In em28xx usb disconnect code path, some dvb fe and tuner drivers
attempt i2c transfers from their release interfaces. When device
is removed, return -ENODEV instead of attempting to transfer data
over i2c.

Signed-off-by: Shuah Khan <shuah.kh@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Shuah Khan 2014-07-11 18:25:55 -03:00 committed by Mauro Carvalho Chehab
parent b89193e0b0
commit cc5c5d20c3
1 changed files with 6 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/media/usb/em28xx/em28xx-i2c.c
View File

@ -501,6 +501,12 @@ static int em28xx_i2c_xfer(struct i2c_adapter *i2c_adap,
int addr, rc, i;
u8 reg;
/* prevent i2c xfer attempts after device is disconnected
some fe's try to do i2c writes/reads from their release
interfaces when called in disconnect path */
if (dev->disconnected)
return -ENODEV;
rc = rt_mutex_trylock(&dev->i2c_bus_lock);
if (rc < 0)
return rc;