From 774dd5d9bdcbfe2efb3425e8a0be0b4d01a65c26 Mon Sep 17 00:00:00 2001 From: "Dyks, Axel (XL)" Date: Sun, 11 Jun 2006 17:14:35 -0300 Subject: [PATCH] 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 Signed-off-by: Axel Dyks Acked-by: Andreas Oberritter Signed-off-by: Mauro Carvalho Chehab --- drivers/media/dvb/cinergyT2/cinergyT2.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) 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; } -- 2.20.1