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smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=Vs0CWLHd; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D8845606A31C for ; Fri, 30 Oct 2026 13:10:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=Vs0CWLHd Received: by smtp.kernel.org (Postfix) with ESMTPSA id 505351F000C1; Fri, 30 Oct 2026 13:10:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793365808; bh=wK83sKtRWQotMzKVpBJAridNbsDwS1yaa0jcH3SwXrM=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=Vs0CWLHdOs4TIbSSRqMhbdZ1wzjKagblMERPND4GRAjn0Xk1waM/uxhNlAcp19GaP IuqZSW9qVWoMcR/E7DfTIJlb8rFz/jQgy0um25ZGWXeQRZsqOWS5RmUXhdoqqIV84T R2X3/2IvyUs8Qckcm2T4eQg8AVTfVfaJt+0KNkSApQXZtP0UZ3RbJ1zBDbqQV6WREj 1boug14MsNiEYJuHzzn3LAo4EeZGOlJUvRtkMB0ZNP2leXkUzy7/FALHo+M2BK1/vq CBwEA3purikju2IQ+4aVxP0RvvQdY2vozJwPfC266hlJHuq6OrmGfxgrvL3kttREBV 7Oo0ngAWjdhOg== Message-ID: <5f75c133-0365-4600-97c1-842ef0458be0@kernel.org> Date: Fri, 30 Oct 2026 14:10:04 +0100 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 4/9] w1: ds28e04: use the bus mutex to talk on the bus To: Greg Kroah-Hartman Cc: Josef Bacik , linux-kernel@vger.kernel.org, stable References: <20261027-llm-char-misc-w1-v1-0-d2e6bfafb6a4@linuxfoundation.org> <20261027-llm-char-misc-w1-v1-4-d2e6bfafb6a4@linuxfoundation.org> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 27/10/2026 17:04, Greg Kroah-Hartman wrote: > From: Josef Bacik > > Since commit b02f8bede217 ("W1: split master mutex to avoid deadlocks.") > the slave drivers serialise their accesses to the bus with bus_mutex. > This driver, which was merged shortly afterwards, takes the mutex of the > master in the callbacks of its eeprom and pio files instead. > > That mutex is held while a slave which has disappeared from the bus is > removed, which waits for the sysfs callbacks of the slave to return. A > callback which is waiting for the mutex at that moment never does: both > tasks are stuck, and with them the thread of the bus master. > > Besides, it does not keep the other slave drivers off the bus, so that two > transactions can get mixed up on the wire. > > Fixes: fbf7f7b4e2ae ("w1: Add 1-wire slave device driver for DS28E04-100") > Cc: stable > Signed-off-by: Josef Bacik > Signed-off-by: Greg Kroah-Hartman > --- Reviewed-by: Krzysztof Kozlowski Best regards, Krzysztof