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[media] media: am437x-vpfe: Fix a race condition during release 

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: 417d2e507e ("[media] media: platform: add VPFE capture driver support for AM437X")

Cc: <stable@vger.kernel.org> # v4.0+
Signed-off-by: Benoit Parrot <bparrot@ti.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Benoit Parrot 2015-07-15 18:00:06 -03:00 committed by Mauro Carvalho Chehab
parent 2091f5181c
commit c99235fa3e
1 changed files with 12 additions and 2 deletions
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14
drivers/media/platform/am437x/am437x-vpfe.c
View File

@ -1186,14 +1186,24 @@ static int vpfe_initialize_device(struct vpfe_device *vpfe)
static int vpfe_release(struct file *file) static int vpfe_release(struct file *file)
{ {
struct vpfe_device *vpfe = video_drvdata(file); struct vpfe_device *vpfe = video_drvdata(file);
bool fh_singular;
int ret; int ret;
mutex_lock(&vpfe->lock); mutex_lock(&vpfe->lock);
if (v4l2_fh_is_singular_file(file)) /* Save the singular status before we call the clean-up helper */
vpfe_ccdc_close(&vpfe->ccdc, vpfe->pdev); fh_singular = v4l2_fh_is_singular_file(file);
/* the release helper will cleanup any on-going streaming */
ret = _vb2_fop_release(file, NULL); 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); mutex_unlock(&vpfe->lock);
return ret; return ret;