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 11CD527FD43 for ; Thu, 28 May 2026 13:51:44 +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=1779976306; cv=none; b=Z60TYtZvRVLVqCjenNv3hOd0jqDgV9c6oKIuRHCvdGav3FLYv2zAm+ydsckkc7y3CII7H0U2psbNiqKmLeWSMow2z6c9k23uIF8jEsWuiAdp0MWJlm0V99RotZSGbOW4XIKVLW5oXuRyOMRFN6r1TphoZ7DpvdDdaCQHwYWE6Kg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779976306; c=relaxed/simple; bh=ZT29cqzaDqe0/73qUDp4wUkQ93Ae6FolE9i2xbEu2rI=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=ZgiN9BQlEUhY2yZpM4sVQIJOgnOccbR/ZDP30UbfNt8B1M07nAFJlVjVvDCzQEvjHF7Cwc2BzXed3Se5ykT+ZRsVk7tr494z2X+BFIdN3HpHf4aKWKj0+14zn3hGykwLYIYYnaAUl301Gz2q9/DvuqS4o3xrUmS9cb+CUwaUYOI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ENNncRVH; 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="ENNncRVH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3DE651F000E9; Thu, 28 May 2026 13:51:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1779976304; bh=b4VIllxv82m2hzd0rR0ZaLPYJGeU1g7LsrLYXUtKTeQ=; h=Subject:To:Cc:From:Date; b=ENNncRVH4oywYi8R6G3B58TDJxqlz4Q+NmDqrXRdqNC0PxBLXUwaQD1USsmwF77GD 9AC2pvwRerHSwKp/ee0sj6yu0LijJA9Ju2aSL1l3E2uj44V7Sj1BrRfoy//b2mMGRh MwxbkVVVdVFm8dwvcUI06SXEuOBoi5vg0M46rIj8= Subject: FAILED: patch "[PATCH] hwmon: (pmbus/adm1266) serialize GPIO PMBus accesses with" failed to apply to 6.18-stable tree To: abdurrahman@nexthop.ai,bartosz.golaszewski@oss.qualcomm.com,linux@roeck-us.net Cc: From: Date: Thu, 28 May 2026 15:50:41 +0200 Message-ID: <2026052841-exquisite-attach-1b4c@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 6.18-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-6.18.y git checkout FETCH_HEAD git cherry-pick -x bab8c6fb5af8df7e753d196c1262cb78e92ca872 # git commit -s git send-email --to '' --in-reply-to '2026052841-exquisite-attach-1b4c@gregkh' --subject-prefix 'PATCH 6.18.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From bab8c6fb5af8df7e753d196c1262cb78e92ca872 Mon Sep 17 00:00:00 2001 From: Abdurrahman Hussain Date: Mon, 18 May 2026 17:52:30 -0700 Subject: [PATCH] hwmon: (pmbus/adm1266) serialize GPIO PMBus accesses with pmbus_lock adm1266_gpio_get(), adm1266_gpio_get_multiple(), and adm1266_gpio_dbg_show() all issue PMBus reads against the device but none of them take pmbus_lock. The pmbus_core framework 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 GPIO accessor can land between a PAGE write and the subsequent paged read in another thread and corrupt either side's view of the device state machine. Take pmbus_lock at the top of each of the three accessors via the scope-based guard(). The lock is uncontended in the common case and adds only a single mutex round-trip per call. Fixes: d98dfad35c38 ("hwmon: (pmbus/adm1266) Add support for GPIOs") Cc: stable@vger.kernel.org Signed-off-by: Abdurrahman Hussain Reviewed-by: Bartosz Golaszewski Link: https://lore.kernel.org/r/20260518-adm1266-gpio-fixes-v3-6-e425e4f88139@nexthop.ai Signed-off-by: Guenter Roeck diff --git a/drivers/hwmon/pmbus/adm1266.c b/drivers/hwmon/pmbus/adm1266.c index 3e8f2619cb9b..0eef58dd69a6 100644 --- a/drivers/hwmon/pmbus/adm1266.c +++ b/drivers/hwmon/pmbus/adm1266.c @@ -173,6 +173,8 @@ static int adm1266_gpio_get(struct gpio_chip *chip, unsigned int offset) else pmbus_cmd = ADM1266_PDIO_STATUS; + guard(pmbus_lock)(data->client); + ret = i2c_smbus_read_block_data(data->client, pmbus_cmd, read_buf); if (ret < 0) return ret; @@ -195,6 +197,8 @@ static int adm1266_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask unsigned int gpio_nr; int ret; + guard(pmbus_lock)(data->client); + ret = i2c_smbus_read_block_data(data->client, ADM1266_GPIO_STATUS, read_buf); if (ret < 0) return ret; @@ -236,6 +240,8 @@ static void adm1266_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) int ret; int i; + guard(pmbus_lock)(data->client); + for (i = 0; i < ADM1266_GPIO_NR; i++) { write_cmd = adm1266_gpio_mapping[i][1]; ret = adm1266_pmbus_block_xfer(data, ADM1266_GPIO_CONFIG, 1, &write_cmd, read_buf);