[media] dvb_usb_v2: switch interruptible mutex to normal

Fixes error: dvb_usb_v2: pid_filter() failed=-4

error code -4 is EINTR, Interrupted system call

That error blocks I/O in some cases as -EINTR error was returned
by the mutex which was protecting USB control messages. We want
configure hardware to sleep mode on every case after tuning is
stopped. That kind of behavior blocks it, leaving hardware some
unwanted state in worst case.

That error was seen every time when af9015 was plugged to USB1.1
which leads use of hardware PID filters. Stop tuning (tzap) with
ctrl+c failed as driver tries to remove hardware PID filters.

Tested with every hardware which uses routine in question.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/usb/dvb-usb-v2/dvb_usb_urb.c b/drivers/media/usb/dvb-usb-v2/dvb_usb_urb.c
index 0431beed0ef44dcfcfc7043d85fe514f602f1d10..5716662b483451f4d3a5fb6204091a6285f349e2 100644 (file)
--- a/drivers/media/usb/dvb-usb-v2/dvb_usb_urb.c
+++ b/drivers/media/usb/dvb-usb-v2/dvb_usb_urb.c
@@ -32,9 +32,7 @@ int dvb_usbv2_generic_rw(struct dvb_usb_device *d, u8 *wbuf, u16 wlen, u8 *rbuf,
                return -EINVAL;
        }
 
-       ret = mutex_lock_interruptible(&d->usb_mutex);
-       if (ret < 0)
-               return ret;
+       mutex_lock(&d->usb_mutex);
 
        dev_dbg(&d->udev->dev, "%s: >>> %*ph\n", __func__, wlen, wbuf);