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.
Signed-off-by: Benoit Parrot <bparrot@xxxxxx>
---
drivers/media/platform/am437x/am437x-vpfe.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/media/platform/am437x/am437x-vpfe.c b/drivers/media/platform/am437x/am437x-vpfe.c
index a30cc2f..eb25c43 100644
--- a/drivers/media/platform/am437x/am437x-vpfe.c
+++ b/drivers/media/platform/am437x/am437x-vpfe.c
@@ -1185,14 +1185,21 @@ static int vpfe_initialize_device(struct vpfe_device *vpfe)
static int vpfe_release(struct file *file)
{
struct vpfe_device *vpfe = video_drvdata(file);
+ bool fh_singular = v4l2_fh_is_singular_file(file);
int ret;
mutex_lock(&vpfe->lock);
- if (v4l2_fh_is_singular_file(file))
- vpfe_ccdc_close(&vpfe->ccdc, vpfe->pdev);
+ /* 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;
--
1.8.5.1
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