From: Ricardo Ribalda Date: Mon, 20 Jun 2016 12:47:22 +0000 (-0300) Subject: vb2: V4L2_BUF_FLAG_DONE is set after DQBUF X-Git-Tag: accepted/tizen/unified/20180417.173214~18 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=refs%2Fchanges%2F77%2F175677%2F1;p=profile%2Fwearable%2Fplatform%2Fkernel%2Flinux-3.18-exynos7270.git vb2: V4L2_BUF_FLAG_DONE is set after DQBUF commit 3171cc2b4eb9831ab4df1d80d0410a945b8bc84e upstream. According to the doc, V4L2_BUF_FLAG_DONE is cleared after DQBUF: V4L2_BUF_FLAG_DONE 0x00000004 ... After calling the VIDIOC_QBUF or VIDIOC_DQBUF it is always cleared ... Unfortunately, it seems that videobuf2 keeps it set after DQBUF. This can be tested with vivid and dev_debug: [257604.338082] video1: VIDIOC_DQBUF: 71:33:25.00260479 index=3, type=vid-cap, flags=0x00002004, field=none, sequence=163, memory=userptr, bytesused=460800, offset/userptr=0x344b000, length=460800 This patch forces FLAG_DONE to 0 after calling DQBUF. Reported-by: Dimitrios Katsaros Signed-off-by: Ricardo Ribalda Delgado Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Greg Kroah-Hartman [sw0312.kim: cherry-pick from linux-3.18.y] Signed-off-by: Seung-Woo Kim Change-Id: I22dc967ed1cceece77e6235c72ebdb3472bd4245 --- diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c index 43fbff6..7db2d10 100644 --- a/drivers/media/v4l2-core/videobuf2-core.c +++ b/drivers/media/v4l2-core/videobuf2-core.c @@ -2159,6 +2159,11 @@ static int vb2_internal_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool n dprintk(1, "dqbuf of buffer %d, with state %d\n", vb->v4l2_buf.index, vb->state); + /* + * After calling the VIDIOC_DQBUF V4L2_BUF_FLAG_DONE must be + * cleared. + */ + b->flags &= ~V4L2_BUF_FLAG_DONE; return 0; }