On 07/12/2015 06:08 PM, Laurent Pinchart wrote:
Commit 77a3c6fd90c9 ("[media] vb2: Don't WARN when v4l2_buffer.bytesused
is 0 for multiplanar buffers") uses the __WARN() macro which isn't
defined when CONFIG_BUG isn't set. This introduces a compilation
breakage. Fix it by using WARN_ON() instead.
The commit was also broken in that it merged v1 of the patch while a new
v2 version had been submitted, reviewed and acked. Fix it by
incorporating the changes from v1 to v2.
Fixes: 77a3c6fd90c9 ("[media] vb2: Don't WARN when v4l2_buffer.bytesused is 0 for multiplanar buffers")
Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
---
drivers/media/v4l2-core/videobuf2-core.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
Mauro,
Commit 77a3c6fd90c9 was merged in v4.2-rc1, so this is a v4.2 regression. The
commit was also marked with a Fixes: line for commit f61bf13b6a07, which was
merged in v4.1-rc1. It might thus get backported to the v4.1 stable series, in
which case this fix needs to be backported as well. I'll let you sort this out.
diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c
index 93b315459098..db11d853b060 100644
--- a/drivers/media/v4l2-core/videobuf2-core.c
+++ b/drivers/media/v4l2-core/videobuf2-core.c
@@ -1244,19 +1244,19 @@ EXPORT_SYMBOL_GPL(vb2_discard_done);
Changing from __WARN to WARN_ON fixes the problem that I found. For that part
Acked-by: Larry Finger <Larry.Finger@xxxxxxxxxxxx>
Larry
static void vb2_warn_zero_bytesused(struct vb2_buffer *vb)
{
- static bool __check_once __read_mostly;
+ static bool check_once;
- if (__check_once)
+ if (check_once)
return;
- __check_once = true;
- __WARN();
+ check_once = true;
+ WARN_ON(1);
- pr_warn_once("use of bytesused == 0 is deprecated and will be removed in the future,\n");
+ pr_warn("use of bytesused == 0 is deprecated and will be removed in the future,\n");
if (vb->vb2_queue->allow_zero_bytesused)
- pr_warn_once("use VIDIOC_DECODER_CMD(V4L2_DEC_CMD_STOP) instead.\n");
+ pr_warn("use VIDIOC_DECODER_CMD(V4L2_DEC_CMD_STOP) instead.\n");
else
- pr_warn_once("use the actual size instead.\n");
+ pr_warn("use the actual size instead.\n");
}
/**
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