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[83.28.42.246]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5aa462cf605sm333990e87.15.2026.05.26.03.16.07 (version=TLS1_2 cipher=AES128-SHA bits=128/128); Tue, 26 May 2026 03:16:08 -0700 (PDT) Date: Tue, 26 May 2026 12:16:05 +0200 From: Michal Pecio To: Henry Lin Cc: Laurent Pinchart , Mauro Carvalho Chehab , "linux-media@vger.kernel.org" , "linux-usb@vger.kernel.org" , "linux-kernel@vger.kernel.org" Subject: Re: [RFC PATCH 0/1] media: uvcvideo: reset interface on bulk stream stop Message-ID: <20260526121605.332525c6.michal.pecio@gmail.com> In-Reply-To: References: <20260525182028.2148267-1-henryl@nvidia.com> <20260526015514.466b72d4.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-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Tue, 26 May 2026 09:55:19 +0000, Henry Lin wrote: > I tested 25e531b422dc ("usb: xhci: Make usb_host_endpoint.hcpriv > survive endpoint_disable()") on the affected setup, and it fixes the > issue. Good. > With that change applied, repeated stop/start cycles complete > successfully, and I no longer see the uvcvideo -71 transfer errors. Were you seeing one such error for each restart, followed by uvcvideo dropping a few frames and continuing to stream normally, or multiple transaction errors and complete functional failure? I was seeing the formrer on several tested HCs, except for those from ASMedia which never completed the affected URB at all (IMO a HW bug). I think multiple errors would also be an indication of some bug, possibly in HW, possibly worth looking into in its own right. Regards, Michal