* [PATCH] media: saa7146: Avoid using BUG_ON as an assertion
@ 2019-12-15 19:21 Aditya Pakki
2019-12-16 10:22 ` Markus Elfring
0 siblings, 1 reply; 2+ messages in thread
From: Aditya Pakki @ 2019-12-15 19:21 UTC (permalink / raw)
To: pakki001
Cc: kjlu, Hans Verkuil, Mauro Carvalho Chehab, linux-media, linux-kernel
In video_begin and video_end, saa7146_format_by_fourcc can return
NULL and is checked via BUG_ON. However, by returning the error
to the callers upstream, we can avoid the crash and handle it via
recovery code.
Signed-off-by: Aditya Pakki <pakki001@umn.edu>
---
drivers/media/common/saa7146/saa7146_video.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/media/common/saa7146/saa7146_video.c b/drivers/media/common/saa7146/saa7146_video.c
index d16122039b0c..1b6b5d43ad3e 100644
--- a/drivers/media/common/saa7146/saa7146_video.c
+++ b/drivers/media/common/saa7146/saa7146_video.c
@@ -345,7 +345,8 @@ static int video_begin(struct saa7146_fh *fh)
fmt = saa7146_format_by_fourcc(dev, vv->video_fmt.pixelformat);
/* we need to have a valid format set here */
- BUG_ON(NULL == fmt);
+ if (NULL == fmt)
+ return -EINVAL;
if (0 != (fmt->flags & FORMAT_IS_PLANAR)) {
resource = RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP|RESOURCE_DMA3_BRS;
@@ -398,7 +399,8 @@ static int video_end(struct saa7146_fh *fh, struct file *file)
fmt = saa7146_format_by_fourcc(dev, vv->video_fmt.pixelformat);
/* we need to have a valid format set here */
- BUG_ON(NULL == fmt);
+ if (NULL == fmt)
+ return -EINVAL;
if (0 != (fmt->flags & FORMAT_IS_PLANAR)) {
resource = RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP|RESOURCE_DMA3_BRS;
--
2.20.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] media: saa7146: Avoid using BUG_ON as an assertion
2019-12-15 19:21 [PATCH] media: saa7146: Avoid using BUG_ON as an assertion Aditya Pakki
@ 2019-12-16 10:22 ` Markus Elfring
0 siblings, 0 replies; 2+ messages in thread
From: Markus Elfring @ 2019-12-16 10:22 UTC (permalink / raw)
To: Aditya Pakki, linux-media
Cc: linux-kernel, Hans Verkuil, Kangjie Lu, Mauro Carvalho Chehab
…
> +++ b/drivers/media/common/saa7146/saa7146_video.c
@@ -345,7 +345,8 @@ static int video_begin(struct saa7146_fh *fh)
…
- BUG_ON(NULL == fmt);
+ if (NULL == fmt)
…
Would you like to express a null pointer check in a succinct way?
+ if (!fmt)
Will the tag “Fixes” become helpful for the change description?
Regards,
Markus
^ permalink raw reply [flat|nested] 2+ messages in thread
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2019-12-16 10:22 ` Markus Elfring
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