From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5646E26ED33 for ; Thu, 28 May 2026 13:52:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779976345; cv=none; b=D6HJFeWZqYyfzdwNLekCLliXqKHfzJxHwpKPX0bMUhthKABQJU63mywQ9UP/EvSUZKOQJws1wHKQdXk7oAJk7xWK05YdYkpwWTyuIgtH5Mr+Srcb6hTXbJWa6s1wuCTcIpAZpD6MEP7YpLOdxW659DwAmYWE6t2x/JXMW/oWMgc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779976345; c=relaxed/simple; bh=ksrRQqhGOsnDRDPLH8KOizevVRrRkB3HGo77FDwvZAA=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=Nx+dpvV+cv8ALMTtGJhMHIaAoJPFGKeUC0VoDtvdSfv8PjkJFh1lA0Lx/m+lURaN/fATra1rHwbZMFNMmU50Tq7ILIJYlkYkcus8LCOvIu8Gt48rkdK6UUoU8DLTaD9ykCAREdUzK36Ttf32Okzvnc/KL4sN5w/bAFItYeTMFNI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=sVrGjJLZ; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="sVrGjJLZ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BC2BE1F000E9; Thu, 28 May 2026 13:52:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1779976344; bh=RkvLb2siYmf4Uy31MY8vF35FzR2iD5NctLZp1O6Tp7Y=; h=Subject:To:Cc:From:Date; b=sVrGjJLZY4ozqCM65Hk9uh5xm88ja/M5IQvTjJrIKOXPDxAD0LthTSGUBLvHWcwPm egfgBAre6ZM8HAMTj6FNO+NDnLyjTxkbdCDop3+3nAxpG5OzpkNLKQxFbGpHA/E8ci aekihShjiRN56nCUbpUVkzqxVnEFskkjSItyoEj4= Subject: FAILED: patch "[PATCH] hwmon: (pmbus/adm1266) serialize sequencer_state debugfs read" failed to apply to 6.12-stable tree To: abdurrahman@nexthop.ai,linux@roeck-us.net Cc: From: Date: Thu, 28 May 2026 15:51:23 +0200 Message-ID: <2026052823-finalize-overprice-3c30@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 6.12-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.12.y git checkout FETCH_HEAD git cherry-pick -x 4e4af55aaca7f6d7673d5f9889ad0529db86a048 # git commit -s git send-email --to '' --in-reply-to '2026052823-finalize-overprice-3c30@gregkh' --subject-prefix 'PATCH 6.12.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 4e4af55aaca7f6d7673d5f9889ad0529db86a048 Mon Sep 17 00:00:00 2001 From: Abdurrahman Hussain Date: Mon, 18 May 2026 17:52:32 -0700 Subject: [PATCH] hwmon: (pmbus/adm1266) serialize sequencer_state debugfs read with pmbus_lock adm1266_state_read() backs the sequencer_state debugfs entry and issues an i2c_smbus_read_word_data(client, ADM1266_READ_STATE) against the device without taking pmbus_lock. pmbus_core holds pmbus_lock around its own multi-transaction sequences (notably the "set PAGE, then read paged register" pattern used by hwmon attributes), so an unlocked debugfs reader can land between a PAGE write and the subsequent paged read in another thread. READ_STATE itself is not paged, so it cannot corrupt PAGE in flight, but the same defensive serialisation that applies to the GPIO accessors applies here: any direct device access from outside pmbus_core should be ordered with respect to pmbus_core's own. Take pmbus_lock at the top of adm1266_state_read() via the scope-based guard(). Fixes: ed1ff457e187 ("hwmon: (pmbus/adm1266) add debugfs for states") Cc: stable@vger.kernel.org Signed-off-by: Abdurrahman Hussain Link: https://lore.kernel.org/r/20260518-adm1266-gpio-fixes-v3-8-e425e4f88139@nexthop.ai Signed-off-by: Guenter Roeck diff --git a/drivers/hwmon/pmbus/adm1266.c b/drivers/hwmon/pmbus/adm1266.c index 5ddca5701032..6f6ad7b20e9a 100644 --- a/drivers/hwmon/pmbus/adm1266.c +++ b/drivers/hwmon/pmbus/adm1266.c @@ -335,6 +335,7 @@ static int adm1266_state_read(struct seq_file *s, void *pdata) struct i2c_client *client = to_i2c_client(dev); int ret; + guard(pmbus_lock)(client); ret = i2c_smbus_read_word_data(client, ADM1266_READ_STATE); if (ret < 0) return ret;