From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 B8D572FE577 for ; Sun, 1 Mar 2026 01:51:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772329893; cv=none; b=dY+6eoj6eHlAEA0AY0ovVNrvz7vIgEP9yLo9LGOqnZ/hElNb7ppnETVTLiRCHKlrvXFewqczrBEAdWV95vvZTNpC2wRAPOfX37Id9X+/1l6nGct/7PiCy8busopAsWVBnrU0hTHhVcsMw7LLxoJv0dUiPlDTbhjK0jpcnhfjWO4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772329893; c=relaxed/simple; bh=KCJMtWvHcaiO2YtUN9XUle3jC3EhHx3vkL+aSGlOobw=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=ezfkhbeUCoQL0oSsx0o1+Ng/KFvxSVI9+my9+mVwjwG/hFeFj8Hoi/CR56bR/O6PBrCsoNmYPzU6pOu7lOOSDM8Ize+Aeq8dJtx1iG7OzYOeYFp0I0BLWok+asHzVHD/g9jGEPAc9x54hZdWcB5lSRlgiW7d8xh4cxw1VI+yy5Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=d9fKxYrU; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="d9fKxYrU" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 31234C19421; Sun, 1 Mar 2026 01:51:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772329893; bh=KCJMtWvHcaiO2YtUN9XUle3jC3EhHx3vkL+aSGlOobw=; h=From:To:Cc:Subject:Date:From; b=d9fKxYrUo7wriitBZmeoglotCfwjYzSx1AfUKDYKrFpcz5P0R5s0njeIFIPJwCwLD VJB4Czh/Zz/qs728G+StJIdE7klGbpc0cLTqR6orycBinVElncebhm2lfPcR8INaCL l5Q6rUp9bt5I7jHLDbO59AcerTDMMvBSZ5lhwG4r5RZFBuBBLLmyGKgYSRywyu2AX/ iw0Wpx0HrMN4PwT4HKOUVe9+p5u+Hw9vx+xib1dDHM8VBhzNDXeVEZjAgqWhIYlZKg sDTZo8Kvit41Cd7M8sdQ78Bx4OoLj52ru72hPuG5jaTCM/tFoo/rqT2T/P7wkWSXzd KPs3ZOJYPbPwQ== From: Sasha Levin To: stable@vger.kernel.org, dianders@chromium.org Cc: Lee Jones Subject: FAILED: Patch "mfd: core: Add locking around 'mfd_of_node_list'" failed to apply to 5.15-stable tree Date: Sat, 28 Feb 2026 20:51:31 -0500 Message-ID: <20260301015132.1717875-1-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Hint: ignore X-stable: review Content-Transfer-Encoding: 8bit The patch below does not apply to the 5.15-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 . Thanks, Sasha ------------------ original commit in Linus's tree ------------------ >From 20117c92bcf9c11afd64d7481d8f94fdf410726e Mon Sep 17 00:00:00 2001 From: Douglas Anderson Date: Wed, 10 Dec 2025 11:30:03 -0800 Subject: [PATCH] mfd: core: Add locking around 'mfd_of_node_list' Manipulating a list in the kernel isn't safe without some sort of mutual exclusion. Add a mutex any time we access / modify 'mfd_of_node_list' to prevent possible crashes. Cc: stable@vger.kernel.org Fixes: 466a62d7642f ("mfd: core: Make a best effort attempt to match devices with the correct of_nodes") Signed-off-by: Douglas Anderson Link: https://patch.msgid.link/20251210113002.1.I6ceaca2cfb7eb25737012b166671f516696be4fd@changeid Signed-off-by: Lee Jones --- drivers/mfd/mfd-core.c | 36 ++++++++++++++++++++++-------------- 1 file changed, 22 insertions(+), 14 deletions(-) diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c index 6925bedddc80b..a30f93bf030aa 100644 --- a/drivers/mfd/mfd-core.c +++ b/drivers/mfd/mfd-core.c @@ -22,6 +22,7 @@ #include static LIST_HEAD(mfd_of_node_list); +static DEFINE_MUTEX(mfd_of_node_mutex); struct mfd_of_node_entry { struct list_head list; @@ -104,9 +105,11 @@ static int mfd_match_of_node_to_dev(struct platform_device *pdev, u64 of_node_addr; /* Skip if OF node has previously been allocated to a device */ - list_for_each_entry(of_entry, &mfd_of_node_list, list) - if (of_entry->np == np) - return -EAGAIN; + scoped_guard(mutex, &mfd_of_node_mutex) { + list_for_each_entry(of_entry, &mfd_of_node_list, list) + if (of_entry->np == np) + return -EAGAIN; + } if (!cell->use_of_reg) /* No of_reg defined - allocate first free compatible match */ @@ -128,7 +131,8 @@ static int mfd_match_of_node_to_dev(struct platform_device *pdev, of_entry->dev = &pdev->dev; of_entry->np = np; - list_add_tail(&of_entry->list, &mfd_of_node_list); + scoped_guard(mutex, &mfd_of_node_mutex) + list_add_tail(&of_entry->list, &mfd_of_node_list); of_node_get(np); device_set_node(&pdev->dev, of_fwnode_handle(np)); @@ -284,11 +288,13 @@ static int mfd_add_device(struct device *parent, int id, if (cell->swnode) device_remove_software_node(&pdev->dev); fail_of_entry: - list_for_each_entry_safe(of_entry, tmp, &mfd_of_node_list, list) - if (of_entry->dev == &pdev->dev) { - list_del(&of_entry->list); - kfree(of_entry); - } + scoped_guard(mutex, &mfd_of_node_mutex) { + list_for_each_entry_safe(of_entry, tmp, &mfd_of_node_list, list) + if (of_entry->dev == &pdev->dev) { + list_del(&of_entry->list); + kfree(of_entry); + } + } fail_alias: regulator_bulk_unregister_supply_alias(&pdev->dev, cell->parent_supplies, @@ -358,11 +364,13 @@ static int mfd_remove_devices_fn(struct device *dev, void *data) if (cell->swnode) device_remove_software_node(&pdev->dev); - list_for_each_entry_safe(of_entry, tmp, &mfd_of_node_list, list) - if (of_entry->dev == &pdev->dev) { - list_del(&of_entry->list); - kfree(of_entry); - } + scoped_guard(mutex, &mfd_of_node_mutex) { + list_for_each_entry_safe(of_entry, tmp, &mfd_of_node_list, list) + if (of_entry->dev == &pdev->dev) { + list_del(&of_entry->list); + kfree(of_entry); + } + } regulator_bulk_unregister_supply_alias(dev, cell->parent_supplies, cell->num_parent_supplies); -- 2.51.0