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[34.145.178.123]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-6b2a5c202e8sm17734056d6.50.2024.06.14.05.41.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 14 Jun 2024 05:41:40 -0700 (PDT) From: Ricardo Ribalda Date: Fri, 14 Jun 2024 12:41:29 +0000 Subject: [PATCH v6 3/4] media: uvcvideo: Avoid race condition during unregister Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240614-guenter-mini-v6-3-7b7fdc3b21b3@chromium.org> References: <20240614-guenter-mini-v6-0-7b7fdc3b21b3@chromium.org> In-Reply-To: <20240614-guenter-mini-v6-0-7b7fdc3b21b3@chromium.org> To: Mauro Carvalho Chehab Cc: Guenter Roeck , Tomasz Figa , Laurent Pinchart , Alan Stern , Hans Verkuil , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, Sean Paul , Ricardo Ribalda , Sakari Ailus , Sergey Senozhatsky X-Mailer: b4 0.13.0 The control events are handled asynchronously by the driver. Once the control event are handled, the urb is re-submitted. If we simply kill the urb, there is a chance that a control event is waiting to be processed, which will re-submit the urb after the device is disconnected. uvc_status_suspend() flushes the async controls and stops the urb in a correct manner. Reviewed-by: Sergey Senozhatsky Signed-off-by: Ricardo Ribalda Reviewed-by: Laurent Pinchart --- drivers/media/usb/uvc/uvc_status.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/usb/uvc/uvc_status.c b/drivers/media/usb/uvc/uvc_status.c index 375a95dd3011..8fd8250110e2 100644 --- a/drivers/media/usb/uvc/uvc_status.c +++ b/drivers/media/usb/uvc/uvc_status.c @@ -294,7 +294,7 @@ int uvc_status_init(struct uvc_device *dev) void uvc_status_unregister(struct uvc_device *dev) { - usb_kill_urb(dev->int_urb); + uvc_status_suspend(dev); uvc_input_unregister(dev); }