This is a note to let you know that I've just added the patch titled
vb2: V4L2_BUF_FLAG_DONE is set after DQBUF
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
vb2-v4l2_buf_flag_done-is-set-after-dqbuf.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Thu Feb 15 08:44:17 CET 2018
From: Hans Verkuil <hverkuil@xxxxxxxxx>
Date: Wed, 14 Feb 2018 12:52:28 +0100
Subject: vb2: V4L2_BUF_FLAG_DONE is set after DQBUF
To: stable@xxxxxxxxxxxxxxx
Cc: linux-media@xxxxxxxxxxxxxxx, Ricardo Ribalda Delgado <ricardo.ribalda@xxxxxxxxx>, Hans Verkuil <hans.verkuil@xxxxxxxxx>, Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx>
Message-ID: <20180214115240.27650-3-hverkuil@xxxxxxxxx>
From: Ricardo Ribalda <ricardo.ribalda@xxxxxxxxx>
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 <patcherwork@xxxxxxxxx>
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@xxxxxxxxx>
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/media/v4l2-core/videobuf2-v4l2.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/drivers/media/v4l2-core/videobuf2-v4l2.c
+++ b/drivers/media/v4l2-core/videobuf2-v4l2.c
@@ -593,6 +593,12 @@ static int vb2_internal_dqbuf(struct vb2
b->flags & V4L2_BUF_FLAG_LAST)
q->last_buffer_dequeued = true;
+ /*
+ * After calling the VIDIOC_DQBUF V4L2_BUF_FLAG_DONE must be
+ * cleared.
+ */
+ b->flags &= ~V4L2_BUF_FLAG_DONE;
+
return ret;
}
Patches currently in stable-queue which might be from hverkuil@xxxxxxxxx are
queue-4.4/media-v4l2-compat-ioctl32.c-copy-m.userptr-in-put_v4l2_plane32.patch
queue-4.4/media-v4l2-compat-ioctl32.c-avoid-sizeof-type.patch
queue-4.4/media-v4l2-compat-ioctl32.c-drop-pr_info-for-unknown-buffer-type.patch
queue-4.4/media-v4l2-compat-ioctl32.c-add-missing-vidioc_prepare_buf.patch
queue-4.4/vb2-v4l2_buf_flag_done-is-set-after-dqbuf.patch
queue-4.4/media-v4l2-compat-ioctl32.c-refactor-compat-ioctl32-logic.patch
queue-4.4/media-v4l2-compat-ioctl32.c-fix-ctrl_is_pointer.patch
queue-4.4/media-v4l2-compat-ioctl32.c-move-helper-functions-to-__get-put_v4l2_format32.patch
queue-4.4/media-v4l2-compat-ioctl32.c-don-t-copy-back-the-result-for-certain-errors.patch
queue-4.4/media-v4l2-compat-ioctl32.c-make-ctrl_is_pointer-work-for-subdevs.patch
queue-4.4/media-v4l2-compat-ioctl32.c-fix-the-indentation.patch
queue-4.4/media-v4l2-compat-ioctl32-copy-v4l2_window-global_alpha.patch
queue-4.4/media-v4l2-ioctl.c-don-t-copy-back-the-result-for-enotty.patch
queue-4.4/media-v4l2-compat-ioctl32.c-copy-clip-list-in-put_v4l2_window32.patch