From: Changbing Xiong <cb.xiong@samsung.com>
Date: Thu, 21 Aug 2014 02:05:40 +0000 (-0300)
Subject: [media] media: check status of dmxdev->exit in poll functions of demux&dvr
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d102cac8097c71bbbba41f4d0cdf5b509d4c64cf;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

[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>
---

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) {