linux-kernel - [PATCH v2 1/4] media: uvcvideo: Propagate buf->error to userspace

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Message-Id: <20241218-uvc-deprecate-v2-1-ab814139e983@chromium.org>
Date: Wed, 18 Dec 2024 21:39:08 +0000
From: Ricardo Ribalda <ribalda@...omium.org>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
 Hans de Goede <hdegoede@...hat.com>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Ricardo Ribalda <ribalda@...omium.org>
Subject: [PATCH v2 1/4] media: uvcvideo: Propagate buf->error to userspace

Now we return VB2_BUF_STATE_DONE for valid and invalid frames. Propagate
the correct value, so the user can know if the frame is valid or not via
struct v4l2_buffer->flags.

Reported-by: Hans de Goede <hdegoede@...hat.com>
Closes: https://lore.kernel.org/linux-media/84b0f212-cd88-46bb-8e6f-b94ec3eccba6@redhat.com
Fixes: 6998b6fb4b1c ("[media] uvcvideo: Use videobuf2-vmalloc")
Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
 drivers/media/usb/uvc/uvc_queue.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/media/usb/uvc/uvc_queue.c b/drivers/media/usb/uvc/uvc_queue.c
index 26ee85657fc8..f8464f0aae1b 100644
--- a/drivers/media/usb/uvc/uvc_queue.c
+++ b/drivers/media/usb/uvc/uvc_queue.c
@@ -479,7 +479,8 @@ static void uvc_queue_buffer_complete(struct kref *ref)
 
 	buf->state = buf->error ? UVC_BUF_STATE_ERROR : UVC_BUF_STATE_DONE;
 	vb2_set_plane_payload(&buf->buf.vb2_buf, 0, buf->bytesused);
-	vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_DONE);
+	vb2_buffer_done(&buf->buf.vb2_buf, buf->error ? VB2_BUF_STATE_ERROR :
+							VB2_BUF_STATE_DONE);
 }
 
 /*

-- 
2.47.1.613.gc27f4b7a9f-goog