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Mon, 02 Nov 2026 08:21:07 -0800 (PST) Received: from localhost ([153.61.198.246]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3ae6e7d5b8csm19939285a91.1.2026.11.02.08.21.06 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 02 Nov 2026 08:21:06 -0800 (PST) Content-Type: text/plain; charset=UTF-8 Date: Mon, 02 Nov 2026 16:21:06 +0000 Message-Id: Subject: Re: [PATCH 1/2] HID: bpf: serialize hardware operations with device destruction From: "Alexei Starovoitov" To: "Yifan Zhang" , "Jiri Kosina" , "Benjamin Tissoires" , Cc: "Greg Kroah-Hartman" , , In-Reply-To: <179362071770.29269.481376767482231629@stu.pku.edu.cn> References: <179362071770.29269.16022650793604369465@stu.pku.edu.cn> <179362071770.29269.481376767482231629@stu.pku.edu.cn> Content-Transfer-Encoding: 8bit X-Mailing-List: bpf@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 On Mon, Nov 02, 2026 at 03:58 AM Yifan Zhang wrote: > Hold prog_list_lock across HID-BPF hardware operations. Device destruction > sets destroyed while holding the same lock, so it waits for an operation > that has already started. Later operations return -ENODEV before reaching > the low-level driver. Apply the same lifetime rule to output reports. sashiko is right. This will deadlock. pw-bot: cr