This is a note to let you know that I've just added the patch titled
[media] media: am437x-vpfe: Fix a race condition during release
to the 4.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
media-am437x-vpfe-fix-a-race-condition-during-release.patch
and it can be found in the queue-4.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c99235fa3ef833c3c23926085f2bb68851c8460a Mon Sep 17 00:00:00 2001
From: Benoit Parrot <bparrot@xxxxxx>
Date: Wed, 15 Jul 2015 18:00:06 -0300
Subject: [media] media: am437x-vpfe: Fix a race condition during release
From: Benoit Parrot <bparrot@xxxxxx>
commit c99235fa3ef833c3c23926085f2bb68851c8460a upstream.
There was a race condition where during cleanup/release operation
on-going streaming would cause a kernel panic because the hardware
module was disabled prematurely with IRQ still pending.
Fixes: 417d2e507edc ("[media] media: platform: add VPFE capture driver support for AM437X")
Signed-off-by: Benoit Parrot <bparrot@xxxxxx>
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/media/platform/am437x/am437x-vpfe.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
--- a/drivers/media/platform/am437x/am437x-vpfe.c
+++ b/drivers/media/platform/am437x/am437x-vpfe.c
@@ -1185,14 +1185,24 @@ static int vpfe_initialize_device(struct
static int vpfe_release(struct file *file)
{
struct vpfe_device *vpfe = video_drvdata(file);
+ bool fh_singular;
int ret;
mutex_lock(&vpfe->lock);
- if (v4l2_fh_is_singular_file(file))
- vpfe_ccdc_close(&vpfe->ccdc, vpfe->pdev);
+ /* Save the singular status before we call the clean-up helper */
+ fh_singular = v4l2_fh_is_singular_file(file);
+
+ /* the release helper will cleanup any on-going streaming */
ret = _vb2_fop_release(file, NULL);
+ /*
+ * If this was the last open file.
+ * Then de-initialize hw module.
+ */
+ if (fh_singular)
+ vpfe_ccdc_close(&vpfe->ccdc, vpfe->pdev);
+
mutex_unlock(&vpfe->lock);
return ret;
Patches currently in stable-queue which might be from bparrot@xxxxxx are
queue-4.1/media-am437x-vpfe-fix-a-race-condition-during-release.patch
queue-4.1/media-am437x-vpfe-requested-frame-size-and-fmt-overwritten-by-current-sensor-setting.patch
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