[media] lmedm04: Do not unlock mutex if mutex_lock_interruptible failed

There are a couple of places where mutex_unlock() is called even
if mutex_lock_interruptible() failed. The patch fixes the issue.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/dvb/dvb-usb/lmedm04.c b/drivers/media/dvb/dvb-usb/lmedm04.c
index 5b0f43791f77e9db0dd7279d04496372903186c1..773638475a794b80cf8cd1e2ce1833d5ac8c57e8 100644 (file)
--- a/drivers/media/dvb/dvb-usb/lmedm04.c
+++ b/drivers/media/dvb/dvb-usb/lmedm04.c
@@ -666,9 +666,10 @@ static int lme2510_streaming_ctrl(struct dvb_usb_adapter *adap, int onoff)
        else {
                deb_info(1, "STM Steam Off");
                /* mutex is here only to avoid collision with I2C */
-               ret = mutex_lock_interruptible(&adap->dev->i2c_mutex);
+               if (mutex_lock_interruptible(&adap->dev->i2c_mutex) < 0)
+                       return -EAGAIN;
 
-               ret |= lme2510_usb_talk(adap->dev, clear_reg_3,
+               ret = lme2510_usb_talk(adap->dev, clear_reg_3,
                                sizeof(clear_reg_3), rbuf, rlen);
                st->stream_on = 0;
                st->i2c_talk_onoff = 1;
@@ -1099,12 +1100,13 @@ static int lme2510_powerup(struct dvb_usb_device *d, int onoff)
        static u8 rbuf[1];
        int ret, len = 3, rlen = 1;
 
-       ret = mutex_lock_interruptible(&d->i2c_mutex);
+       if (mutex_lock_interruptible(&d->i2c_mutex) < 0)
+               return -EAGAIN;
 
        if (onoff)
-               ret |= lme2510_usb_talk(d, lnb_on, len, rbuf, rlen);
+               ret = lme2510_usb_talk(d, lnb_on, len, rbuf, rlen);
        else
-               ret |= lme2510_usb_talk(d, lnb_off, len, rbuf, rlen);
+               ret = lme2510_usb_talk(d, lnb_off, len, rbuf, rlen);
 
        st->i2c_talk_onoff = 1;