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media: dvb-core: fix epoll() by calling poll_wait first

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The epoll function expects that whenever the poll file op is
called, the poll_wait function is also called. That didn't
always happen in dvb_demux_poll(), dvb_dvr_poll() and
dvb_ca_en50221_io_poll(). Fix this, otherwise epoll()
can timeout when it shouldn't.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reviewed-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Hans Verkuil 2019-02-07 06:49:48 -05:00 committed by Mauro Carvalho Chehab
parent bb436cbeb9
commit c6f5c7c237
2 changed files with 6 additions and 7 deletions
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8
drivers/media/dvb-core/dmxdev.c
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@ -1195,13 +1195,13 @@ static __poll_t dvb_demux_poll(struct file *file, poll_table *wait)
struct dmxdev_filter *dmxdevfilter = file->private_data;
__poll_t mask = 0;
poll_wait(file, &dmxdevfilter->buffer.queue, wait);
if ((!dmxdevfilter) || dmxdevfilter->dev->exit)
return EPOLLERR;
if (dvb_vb2_is_streaming(&dmxdevfilter->vb2_ctx))
return dvb_vb2_poll(&dmxdevfilter->vb2_ctx, file, wait);
poll_wait(file, &dmxdevfilter->buffer.queue, wait);
if (dmxdevfilter->state != DMXDEV_STATE_GO &&
dmxdevfilter->state != DMXDEV_STATE_DONE &&
dmxdevfilter->state != DMXDEV_STATE_TIMEDOUT)
@ -1346,13 +1346,13 @@ static __poll_t dvb_dvr_poll(struct file *file, poll_table *wait)
dprintk("%s\n", __func__);
poll_wait(file, &dmxdev->dvr_buffer.queue, wait);
if (dmxdev->exit)
return EPOLLERR;
if (dvb_vb2_is_streaming(&dmxdev->dvr_vb2_ctx))
return dvb_vb2_poll(&dmxdev->dvr_vb2_ctx, file, wait);
poll_wait(file, &dmxdev->dvr_buffer.queue, wait);
if (((file->f_flags & O_ACCMODE) == O_RDONLY) ||
dmxdev->may_do_mmap) {
if (dmxdev->dvr_buffer.error)

5
drivers/media/dvb-core/dvb_ca_en50221.c
View File

@ -1797,6 +1797,8 @@ static __poll_t dvb_ca_en50221_io_poll(struct file *file, poll_table *wait)
dprintk("%s\n", __func__);
poll_wait(file, &ca->wait_queue, wait);
if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1)
mask |= EPOLLIN;
@ -1804,9 +1806,6 @@ static __poll_t dvb_ca_en50221_io_poll(struct file *file, poll_table *wait)
if (mask)
return mask;
/* wait for something to happen */
poll_wait(file, &ca->wait_queue, wait);
if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1)
mask |= EPOLLIN;