[media] media: vb2: fix allocation failure check

__vb2_queue_alloc function returns the number of successfully allocated
buffers. There is no point in checking if the returned value is negative.
If this function returns 0, videobuf2 should just return -ENOMEM to
userspace, because no driver can work without memory buffers.

Reported-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
CC: Pawel Osciak <pawel@osciak.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/video/videobuf2-core.c b/drivers/media/video/videobuf2-core.c
index 84f03b2..3015e60 100644 (file)
--- a/drivers/media/video/videobuf2-core.c
+++ b/drivers/media/video/videobuf2-core.c
@@ -532,9 +532,9 @@ int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req)
        /* Finally, allocate buffers and video memory */
        ret = __vb2_queue_alloc(q, req->memory, num_buffers, num_planes,
                                plane_sizes);
-       if (ret < 0) {
-               dprintk(1, "Memory allocation failed with error: %d\n", ret);
-               return ret;
+       if (ret == 0) {
+               dprintk(1, "Memory allocation failed\n");
+               return -ENOMEM;
        }
 
        /*