* [PATCH 0/1] V4L: Event: debugging fixes
@ 2010-05-03 15:42 Sakari Ailus
2010-05-03 15:42 ` [PATCH 1/1] V4L: Events: Replace bad WARN_ON() with assert_spin_locked() Sakari Ailus
0 siblings, 1 reply; 3+ messages in thread
From: Sakari Ailus @ 2010-05-03 15:42 UTC (permalink / raw)
To: linux-media@vger.kernel.org; +Cc: Laurent Pinchart
Hi,
Laurent Pinchart found that on uni-processor kernels without spinlock
debugging spin_is_locked() is always zero, which causes a bad WARN_ON()
message to be shown. The following patch removes the WARN_ON() and
replaces it with assert_spin_locked() which works correctly.
Regards,
--
Sakari Ailus
sakari.ailus@maxwell.research.nokia.com
^ permalink raw reply [flat|nested] 3+ messages in thread
* [PATCH 1/1] V4L: Events: Replace bad WARN_ON() with assert_spin_locked()
2010-05-03 15:42 [PATCH 0/1] V4L: Event: debugging fixes Sakari Ailus
@ 2010-05-03 15:42 ` Sakari Ailus
2010-05-03 15:57 ` Laurent Pinchart
0 siblings, 1 reply; 3+ messages in thread
From: Sakari Ailus @ 2010-05-03 15:42 UTC (permalink / raw)
To: linux-media; +Cc: laurent.pinchart
spin_is_locked() always returns zero when spinlock debugging is
disabled on a single CPU machine. Replace WARN_ON() with
assert_spin_locked().
Thanks to Laurent Pinchart for spotting this!
Signed-off-by: Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>
---
drivers/media/video/v4l2-event.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/drivers/media/video/v4l2-event.c b/drivers/media/video/v4l2-event.c
index 170e40f..91bb1c8 100644
--- a/drivers/media/video/v4l2-event.c
+++ b/drivers/media/video/v4l2-event.c
@@ -152,7 +152,7 @@ static struct v4l2_subscribed_event *v4l2_event_subscribed(
struct v4l2_events *events = fh->events;
struct v4l2_subscribed_event *sev;
- WARN_ON(!spin_is_locked(&fh->vdev->fh_lock));
+ assert_spin_locked(&fh->vdev->fh_lock);
list_for_each_entry(sev, &events->subscribed, list) {
if (sev->type == type)
--
1.5.6.5
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH 1/1] V4L: Events: Replace bad WARN_ON() with assert_spin_locked()
2010-05-03 15:42 ` [PATCH 1/1] V4L: Events: Replace bad WARN_ON() with assert_spin_locked() Sakari Ailus
@ 2010-05-03 15:57 ` Laurent Pinchart
0 siblings, 0 replies; 3+ messages in thread
From: Laurent Pinchart @ 2010-05-03 15:57 UTC (permalink / raw)
To: Sakari Ailus; +Cc: linux-media
On Monday 03 May 2010 17:42:46 Sakari Ailus wrote:
> spin_is_locked() always returns zero when spinlock debugging is
> disabled on a single CPU machine. Replace WARN_ON() with
> assert_spin_locked().
>
> Thanks to Laurent Pinchart for spotting this!
>
> Signed-off-by: Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> ---
> drivers/media/video/v4l2-event.c | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/media/video/v4l2-event.c
> b/drivers/media/video/v4l2-event.c index 170e40f..91bb1c8 100644
> --- a/drivers/media/video/v4l2-event.c
> +++ b/drivers/media/video/v4l2-event.c
> @@ -152,7 +152,7 @@ static struct v4l2_subscribed_event
> *v4l2_event_subscribed( struct v4l2_events *events = fh->events;
> struct v4l2_subscribed_event *sev;
>
> - WARN_ON(!spin_is_locked(&fh->vdev->fh_lock));
> + assert_spin_locked(&fh->vdev->fh_lock);
>
> list_for_each_entry(sev, &events->subscribed, list) {
> if (sev->type == type)
--
Regards,
Laurent Pinchart
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2010-05-03 15:56 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
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2010-05-03 15:42 [PATCH 0/1] V4L: Event: debugging fixes Sakari Ailus
2010-05-03 15:42 ` [PATCH 1/1] V4L: Events: Replace bad WARN_ON() with assert_spin_locked() Sakari Ailus
2010-05-03 15:57 ` Laurent Pinchart
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