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[83.28.43.184]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b5cba171929sm205081766b.33.2025.10.15.04.36.44 (version=TLS1_2 cipher=AES128-SHA bits=128/128); Wed, 15 Oct 2025 04:36:45 -0700 (PDT) Date: Wed, 15 Oct 2025 13:36:42 +0200 From: Michal Pecio To: Laurent Pinchart , Hans de Goede , Mauro Carvalho Chehab Cc: Hans Verkuil , Ricardo Ribalda , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] media: uvcvideo: Return queued buffers on start_streaming() failure Message-ID: <20251015133642.3dede646.michal.pecio@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Return buffers if streaming fails to start due to uvc_pm_get() error. This bug may be responsible for a warning I got running while :; do yavta -c3 /dev/video0; done on an xHCI controller which failed under this workload. I had no luck reproducing this warning again to confirm. xhci_hcd 0000:09:00.0: HC died; cleaning up usb 13-2: USB disconnect, device number 2 WARNING: CPU: 2 PID: 29386 at drivers/media/common/videobuf2/videobuf2-core= .c:1803 vb2_start_streaming+0xac/0x120 Fixes: 7dd56c47784a ("media: uvcvideo: Remove stream->is_streaming field") Cc: stable@vger.kernel.org Signed-off-by: Michal Pecio Reviewed-by: Laurent Pinchart Reviewed-by: Ricardo Ribalda --- 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 790184c9843d..f49c538618bc 100644 --- a/drivers/media/usb/uvc/uvc_queue.c +++ b/drivers/media/usb/uvc/uvc_queue.c @@ -177,7 +177,7 @@ static int uvc_start_streaming_video(struct vb2_queue *= vq, unsigned int count) =20 ret =3D uvc_pm_get(stream->dev); if (ret) - return ret; + goto return_buffers; =20 queue->buf_used =3D 0; =20 @@ -187,6 +187,7 @@ static int uvc_start_streaming_video(struct vb2_queue *= vq, unsigned int count) =20 uvc_pm_put(stream->dev); =20 +return_buffers: uvc_queue_return_buffers(queue, UVC_BUF_STATE_QUEUED); =20 return ret; --=20 2.48.1