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Thu, 19 Dec 2024 15:23:50 +0000 Message-ID: <531681bd-30f5-4a70-a156-bf8754b8e072@intel.com> Date: Thu, 19 Dec 2024 16:23:02 +0100 User-Agent: Mozilla Thunderbird Subject: Re: [RESEND. PATCH] mt76: mt76u_vendor_request: Do not print error messages when -EPROTO To: WangYuli CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , References: <1E6ABDEA91ADAB1A+20241218090833.140045-1-wangyuli@uniontech.com> <5DB5DA2260D540B9+359f8cbf-e560-495d-8afe-392573f1171b@uniontech.com> From: Alexander Lobakin Content-Language: en-US In-Reply-To: <5DB5DA2260D540B9+359f8cbf-e560-495d-8afe-392573f1171b@uniontech.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-ClientProxiedBy: ZR2P278CA0028.CHEP278.PROD.OUTLOOK.COM (2603:10a6:910:46::8) To DS0PR11MB8718.namprd11.prod.outlook.com (2603:10b6:8:1b9::20) Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS0PR11MB8718:EE_|SN7PR11MB7637:EE_ X-MS-Office365-Filtering-Correlation-Id: f1e658d7-500a-4083-82d7-08dd204123c4 X-LD-Processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|7416014|376014|366016|7053199007; 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So you need to add the correct tree and/or subject prefix and specify "Fixes:" tag with the commit this change fixes. >> How do other drivers handle this? >> Can -EPROTO happen in other cases, not only unplugging, which this patch >> would break? >> > When initializing the network card, unplugging the device will trigger > an -EPROTO error. > > The exception is printed as follows： > >          >         mt76x2u 2-2.4:1.0: vendor request req:47 off:9018 failed:-71 >         mt76x2u 2-2.4:1.0: vendor request req:47 off:9018 failed:-71 >         ... >          > > It will continue to print more than 2000 times for about 5 minutes, > causing the usb device to be unable to be disconnected.  During this > period, the usb port cannot recognize the new device because the old > device has not disconnected. > > There may be other operating methods that cause -EPROTO, but -EPROTO is > a low-level hardware error. It is unwise to repeat vendor requests > expecting to read correct data. It is a better choice to treat -EPROTO > and -ENODEV the same way. > > Similar to commit （mt76: usb: process URBs with status EPROTO > properly）do no schedule rx_worker for urb marked with status set - > EPROTO. I also reproduced this situation when plugging and unplugging > the device, and this patch is effective. I'm not a wireless expert, from my PoV sounds good. Just describe everything in details in the commit message, so that it will be clear for everyone. > > Just do not vendor request again for urb marked with status set -EPROTO . > > > Thanks, > > -- > WangYuli Thanks, Olek