[PATCH v2] [media] vb2: include lengths in dmabuf qbuf debug message

[Javier Martinez Canillas]

If the VIDIOC_QBUF ioctl fails due a wrong dmabuf length, it's
useful to get the invalid and minimum lengths as a debug info.

Before this patch:

vb2-core: __qbuf_dmabuf: invalid dmabuf length for plane 1

After this patch:

vb2-core: __qbuf_dmabuf: invalid dmabuf length 221248 for plane 1, minimum length 410880

Signed-off-by: Javier Martinez Canillas <javier@xxxxxxxxxxxxxxx>

---

Changes in v2:
- Use %u instead of %d (Sakari Ailus)
- Include min_length (Sakari Ailus)

 drivers/media/v4l2-core/videobuf2-core.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c
index b6fbc04f9699..bbba50d6e1ad 100644
--- a/drivers/media/v4l2-core/videobuf2-core.c
+++ b/drivers/media/v4l2-core/videobuf2-core.c
@@ -1227,8 +1227,10 @@ static int __qbuf_dmabuf(struct vb2_buffer *vb, const void *pb)
 			planes[plane].length = dbuf->size;
 
 		if (planes[plane].length < vb->planes[plane].min_length) {
-			dprintk(1, "invalid dmabuf length for plane %d\n",
-				plane);
+			dprintk(1, "invalid dmabuf length %u for plane %d, "
+				"minimum length %u\n",
+				planes[plane].length, plane,
+				vb->planes[plane].min_length);
 			dma_buf_put(dbuf);
 			ret = -EINVAL;
 			goto err;
-- 
2.5.5