[media] videobuf: Allow reqbufs(0) to free current buffers

All the infrastructure for this is already there, and despite our desires for
the old videobuf code to go away, it is currently still in use in 18 drivers.

Allowing reqbufs(0) makes these drivers behave consistent with modern drivers,
making live easier for userspace, see e.g. :
https://bugzilla.gnome.org/show_bug.cgi?id=735660

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

1 files changed, 6 insertions, 5 deletions

diff --git a/drivers/media/v4l2-core/videobuf-core.c b/drivers/media/v4l2-core/videobuf-core.c
index fb5ee5dd8fe9..b91a266d0b7e 100644
--- a/drivers/media/v4l2-core/videobuf-core.c
+++ b/drivers/media/v4l2-core/videobuf-core.c
@@ -441,11 +441,6 @@ int videobuf_reqbufs(struct videobuf_queue *q,
         unsigned int size, count;
         int retval;
 
-        if (req->count < 1) {
-                dprintk(1, "reqbufs: count invalid (%d)\n", req->count);
-                return -EINVAL;
-        }
-
         if (req->memory != V4L2_MEMORY_MMAP     &&
             req->memory != V4L2_MEMORY_USERPTR  &&
             req->memory != V4L2_MEMORY_OVERLAY) {
@@ -471,6 +466,12 @@ int videobuf_reqbufs(struct videobuf_queue *q,
                 goto done;
         }
 
+        if (req->count == 0) {
+                dprintk(1, "reqbufs: count invalid (%d)\n", req->count);
+                retval = __videobuf_free(q);
+                goto done;
+        }
+
         count = req->count;
         if (count > VIDEO_MAX_FRAME)
                 count = VIDEO_MAX_FRAME;