[media] gspca: reset image_len to 0 on LAST_PACKET when discarding frame

Reset image and image_len to NULL/0 on LAST_PACKET when we're in discard
frame mode, just like we do when not discarding the current frame.

The new se401 driver uses image_len for SOF/EOF detection and thus depends on
this.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/media/video/gspca/gspca.c b/drivers/media/video/gspca/gspca.c
index d0b79a9f88b7..d94c108dd8dc 100644
--- a/drivers/media/video/gspca/gspca.c
+++ b/drivers/media/video/gspca/gspca.c
@@ -443,8 +443,11 @@ void gspca_frame_add(struct gspca_dev *gspca_dev,
         } else {
                 switch (gspca_dev->last_packet_type) {
                 case DISCARD_PACKET:
-                        if (packet_type == LAST_PACKET)
+                        if (packet_type == LAST_PACKET) {
                                 gspca_dev->last_packet_type = packet_type;
+                                gspca_dev->image = NULL;
+                                gspca_dev->image_len = 0;
+                        }
                         return;
                 case LAST_PACKET:
                         return;