[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>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/media/dvb-core/dmxdev.c b/drivers/media/dvb-core/dmxdev.c
index 7a5c07003c41..42b5e70d5ca7 100644
--- a/drivers/media/dvb-core/dmxdev.c
+++ b/drivers/media/dvb-core/dmxdev.c
@@ -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) {