diff options
| author | Dyks, Axel (XL) <xl@xlsigned.net> | 2006-06-11 22:14:35 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@infradead.org> | 2006-06-25 07:05:07 +0200 |
| commit | 774dd5d9bdcbfe2efb3425e8a0be0b4d01a65c26 (patch) | |
| tree | 61d89fd4b4e952d9d5aa9f62a24371ff78b9641c | |
| parent | V4L/DVB (4088): Fixes for card cx88 #50 (diff) | |
| download | linux-774dd5d9bdcbfe2efb3425e8a0be0b4d01a65c26.tar.xz linux-774dd5d9bdcbfe2efb3425e8a0be0b4d01a65c26.zip | |
V4L/DVB (4090): Fix cinergyt2_poll() to allow non-blocking IO on frontend
cinergyt2_poll()" shouldn't return (POLLIN | POLLRDNORM | POLLPRI) when
there are no pending events. User space programs that do non-bocking IO
using "select()" and/or "poll()" would otherwise produce high system load.
Acked-by: Andreas Oberritter <obi@linuxtv.org>
Signed-off-by: Axel Dyks <xl@xlsigned.net>
Acked-by: Andreas Oberritter <obi@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
| -rw-r--r-- | drivers/media/dvb/cinergyT2/cinergyT2.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/media/dvb/cinergyT2/cinergyT2.c b/drivers/media/dvb/cinergyT2/cinergyT2.c index c7e4134872d4..8cfdad6f50fb 100644 --- a/drivers/media/dvb/cinergyT2/cinergyT2.c +++ b/drivers/media/dvb/cinergyT2/cinergyT2.c @@ -544,15 +544,19 @@ static unsigned int cinergyt2_poll (struct file *file, struct poll_table_struct { struct dvb_device *dvbdev = file->private_data; struct cinergyt2 *cinergyt2 = dvbdev->priv; + unsigned int mask = 0; if (cinergyt2->disconnect_pending || mutex_lock_interruptible(&cinergyt2->sem)) return -ERESTARTSYS; poll_wait(file, &cinergyt2->poll_wq, wait); + if (cinergyt2->pending_fe_events != 0) + mask |= (POLLIN | POLLRDNORM | POLLPRI); + mutex_unlock(&cinergyt2->sem); - return (POLLIN | POLLRDNORM | POLLPRI); + return mask; } |