[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 5b0f4379..7736384 100644
--- a/drivers/media/dvb/dvb-usb/lmedm04.c
+++ b/drivers/media/dvb/dvb-usb/lmedm04.c
@@ -666,9 +666,10 @@
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 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;