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([2001:a61:1337:8001:1c60:c024:2a6e:24da]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ae6e7e91d05sm984882066b.3.2025.07.15.04.49.06 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 15 Jul 2025 04:49:07 -0700 (PDT) Message-ID: <22e2c652-7861-48d2-b769-79b2ef4ea878@suse.com> Date: Tue, 15 Jul 2025 13:49:06 +0200 Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] net: usbnet: Avoid potential RCU stall on LINK_CHANGE event To: John Ernberg , Oliver Neukum , Andrew Lunn , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: Ming Lei , "netdev@vger.kernel.org" , "linux-usb@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" References: <20250710085028.1070922-1-john.ernberg@actia.se> Content-Language: en-US From: Oliver Neukum In-Reply-To: <20250710085028.1070922-1-john.ernberg@actia.se> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 10.07.25 10:50, John Ernberg wrote: > Having a Gemalto Cinterion PLS83-W modem attached to USB and activating the > cellular data link would sometimes yield the following RCU stall, leading > to a system freeze: [..] > if (!netif_carrier_ok(dev->net)) { > /* kill URBs for reading packets to save bus bandwidth */ > + usbnet_pause_rx(dev); > unlink_urbs(dev, &dev->rxq); > + usbnet_resume_rx(dev); This will schedule work. Do you really want that? Regards Oliver