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[media] media: check status of dmxdev->exit in poll functions of demux&dvr 

when usb-type tuner is pulled out, user applications did not close device's FD,
and go on polling the device, we should return POLLERR directly.

Signed-off-by: Changbing Xiong <cb.xiong@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Changbing Xiong 2014-08-20 23:05:40 -03:00 committed by Mauro Carvalho Chehab
parent 236c9bfa4a
commit d102cac809
1 changed files with 5 additions and 1 deletions
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6
drivers/media/dvb-core/dmxdev.c
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@ -1085,9 +1085,10 @@ static long dvb_demux_ioctl(struct file *file, unsigned int cmd,
static unsigned int dvb_demux_poll(struct file *file, poll_table *wait)
{
struct dmxdev_filter *dmxdevfilter = file->private_data;
struct dmxdev *dmxdev = dmxdevfilter->dev;
unsigned int mask = 0;
if (!dmxdevfilter)
if ((!dmxdevfilter) || (dmxdev->exit))
return POLLERR;
poll_wait(file, &dmxdevfilter->buffer.queue, wait);
@ -1181,6 +1182,9 @@ static unsigned int dvb_dvr_poll(struct file *file, poll_table *wait)
dprintk("function : %s\n", __func__);
if (dmxdev->exit)
return POLLERR;
poll_wait(file, &dmxdev->dvr_buffer.queue, wait);
if ((file->f_flags & O_ACCMODE) == O_RDONLY) {