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Date: Fri, 11 Jul 2014 15:25:55 -0600 From: Shuah Khan <shuah.kh@...sung.com> To: m.chehab@...sung.com Cc: Shuah Khan <shuah.kh@...sung.com>, linux-media@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [PATCH] media: em28xx - fix i2c_xfer to return -ENODEV when dev is removed 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@...sung.com> --- drivers/media/usb/em28xx/em28xx-i2c.c | 6 ++++++ 1 file changed, 6 insertions(+) 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; -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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