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([2001:a61:13f5:2701:b3a3:b9f5:f3dd:ee85]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4a18bead84esm347856035e9.13.2026.10.13.01.54.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 13 Oct 2026 01:54:10 -0700 (PDT) Message-ID: <4d3a6c5c-7516-4bab-ac0a-3cf4d7a034a2@suse.com> Date: Tue, 13 Oct 2026 10:54:09 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net v6] usbnet: fix smp_processor_id() use in preemptible context To: Alan Stern , Sebastian Andrzej Siewior Cc: Greg Kroah-Hartman , Jakub Kicinski , =?UTF-8?Q?=C3=96mer_Mete_Kaya?= , netdev@vger.kernel.org, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, pabeni@redhat.com, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, david.laight.linux@gmail.com, syzbot+04cd90bb99c6ef81a65d@syzkaller.appspotmail.com References: <20261004215937.302247-1-omermetekaya0@gmail.com> <20261007200049.079aeb75@kernel.org> <7c4a2f1c-f16d-479b-a11f-cef962d5e2c7@rowland.harvard.edu> <20261008094338.301a75fa@kernel.org> <06a81ea1-b17d-40bd-82d9-922de946b86f@rowland.harvard.edu> <2026100910-petition-embattled-94cb@gregkh> <20261012194902.aEq58Q6b@linutronix.de> <8545800a-a37f-482a-9b06-cbdd70312b7a@rowland.harvard.edu> Content-Language: en-US From: Oliver Neukum In-Reply-To: <8545800a-a37f-482a-9b06-cbdd70312b7a@rowland.harvard.edu> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 12.10.26 22:26, Alan Stern wrote: > Today you fix VHCI, tomorrow some other virtual HCD will cause problems. > > Should we document any requirements that all HCDs will have to follow > and that all completion handlers can rely on? Numerous corner cases. For example I strongly suspect that unloading the driver for the HC will always complete URBs synchronously. Please do not do this. Regards Oliver