[media] saa7164: fix poll bugs
- poll doesn't return negative values, so you can't return -EINVAL.
Instead return POLLERR.
- poll can't be called if !video_is_registered(), so this test can
be dropped.
- poll can never do a blocking wait, so remove that check.
- poll shouldn't attempt to start streaming if the caller isn't interested
in read events.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
diff --git a/drivers/media/pci/saa7164/saa7164-encoder.c b/drivers/media/pci/saa7164/saa7164-encoder.c
index 96dd1e4..fd32fa0 100644
--- a/drivers/media/pci/saa7164/saa7164-encoder.c
+++ b/drivers/media/pci/saa7164/saa7164-encoder.c
@@ -915,6 +915,7 @@
static unsigned int fops_poll(struct file *file, poll_table *wait)
{
+ unsigned long req_events = poll_requested_events(wait);
struct saa7164_encoder_fh *fh =
(struct saa7164_encoder_fh *)file->private_data;
struct saa7164_port *port = fh->port;
@@ -928,26 +929,18 @@
saa7164_histogram_update(&port->poll_interval,
port->last_poll_msecs_diff);
- if (!video_is_registered(port->v4l_device))
- return -EIO;
+ if (!(req_events & (POLLIN | POLLRDNORM)))
+ return mask;
if (atomic_cmpxchg(&fh->v4l_reading, 0, 1) == 0) {
if (atomic_inc_return(&port->v4l_reader_count) == 1) {
if (saa7164_encoder_initialize(port) < 0)
- return -EINVAL;
+ return POLLERR;
saa7164_encoder_start_streaming(port);
msleep(200);
}
}
- /* blocking wait for buffer */
- if ((file->f_flags & O_NONBLOCK) == 0) {
- if (wait_event_interruptible(port->wait_read,
- saa7164_enc_next_buf(port))) {
- return -ERESTARTSYS;
- }
- }
-
/* Pull the first buffer from the used list */
if (!list_empty(&port->list_buf_used.list))
mask |= POLLIN | POLLRDNORM;
