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Subject: [media] media: em28xx - fix i2c_xfer to return -ENODEV when dev is removed Author: Shuah Khan <[email protected]> Date: Fri Jul 11 18:25:55 2014 -0300 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 <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]> drivers/media/usb/em28xx/em28xx-i2c.c | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-) --- http://git.linuxtv.org/media_tree.git?a=commitdiff;h=cc5c5d20c3cb9066576043b937b35d6b669a52e0 diff --git a/drivers/media/usb/em28xx/em28xx-i2c.c b/drivers/media/usb/em28xx/em28xx-i2c.c index b58d4eb..1048c1a 100644 --- a/drivers/media/usb/em28xx/em28xx-i2c.c +++ b/drivers/media/usb/em28xx/em28xx-i2c.c @@ -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; _______________________________________________ linuxtv-commits mailing list [email protected] http://www.linuxtv.org/cgi-bin/mailman/listinfo/linuxtv-commits
