[media] v4l2: vb2: one more fix for REQBUFS()

Return immediately if the target number of buffers is the same as
the current one and memory access type doesn't change.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/media/video/videobuf2-core.c b/drivers/media/video/videobuf2-core.c
index c5f99c7d3979..2baf7dbdc01d 100644
--- a/drivers/media/video/videobuf2-core.c
+++ b/drivers/media/video/videobuf2-core.c
@@ -488,6 +488,13 @@ int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req)
                 return -EINVAL;
         }
 
+        /*
+         * If the same number of buffers and memory access method is requested
+         * then return immediately.
+         */
+        if (q->memory == req->memory && req->count == q->num_buffers)
+                return 0;
+
         if (req->count == 0 || q->num_buffers != 0 || q->memory != req->memory) {
                 /*
                  * We already have buffers allocated, so first check if they