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Mon, 25 May 2026 11:21:32 -0700 From: Henry Lin To: Laurent Pinchart , "Mauro Carvalho Chehab" CC: , , , Henry Lin Subject: [RFC PATCH 1/1] media: uvcvideo: reset interface on bulk stream stop Date: Mon, 25 May 2026 18:20:28 +0000 Message-ID: <20260525182028.2148267-2-henryl@nvidia.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260525182028.2148267-1-henryl@nvidia.com> References: <20260525182028.2148267-1-henryl@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NVConfidentiality: public Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: rnnvmail201.nvidia.com (10.129.68.8) To rnnvmail201.nvidia.com (10.129.68.8) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MWH0EPF000C618B:EE_|SN7PR12MB7300:EE_ X-MS-Office365-Filtering-Correlation-Id: 9287ba4a-ab20-4d5f-bea7-08deba8a7bff X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|82310400026|36860700016|376014|56012099003|22082099003|18002099003|6133799003|11063799006; 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charset="utf-8" From: Hans Yang Some bulk-based UVC devices expect the stream sequence number to be reset when the video stream is stopped. The driver currently issues CLEAR_FEATURE(ENDPOINT_HALT) for bulk endpoints, but does not reset the streaming interface alternate setting to 0 in that path. When streaming is started again, the device may expect packets to start from sequence number 0 while the host continues from the previous transaction, leading to transfer errors such as: uvcvideo: Non-zero status (-71) in video completion handler. Reset the streaming interface alternate setting to 0 before clearing halt, matching the stop path used for isochronous endpoints. Signed-off-by: Hans Yang Signed-off-by: Henry Lin --- drivers/media/usb/uvc/uvc_video.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_= video.c index 2094e059d7d3..20cae606f463 100644 --- a/drivers/media/usb/uvc/uvc_video.c +++ b/drivers/media/usb/uvc/uvc_video.c @@ -2319,9 +2319,8 @@ void uvc_video_stop_streaming(struct uvc_streaming *s= tream) { uvc_video_stop_transfer(stream, 1); =20 - if (stream->intf->num_altsetting > 1) { - usb_set_interface(stream->dev->udev, stream->intfnum, 0); - } else { + usb_set_interface(stream->dev->udev, stream->intfnum, 0); + if (stream->intf->num_altsetting =3D=3D 1) { /* * UVC doesn't specify how to inform a bulk-based device * when the video stream is stopped. Windows sends a --=20 2.43.0