From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794049768; b=zgda9WeaGszl9eqQQqxTQrPJHhicrHLyXVBRWyJY/3e+uf0tlRoAIMwJRSVuvpdpK+MY 5c6OD/ojuQdKXdbKklUbU29VA3HkkvLkwwXipLesyyZuoBnQ6q6vTbs7731kYBvW8oaUJ aVSU0aAtkAaNZocT2OfFBc9wXOS0VGKvJttC4tHexb2PPepecuV6z26/VHrBcljRLXMra fxK8Ok9+uiTBJsVGLKSTNkgAHajvch2TtuJQMjq43KUe1/kgHre6E3DHZwaxU2LNJyjCE cJ/4F8LoTZMaRAGLOinPfzZdzX4MYiiyHhD5Cek2e50b5XFwvYhecbtftNEYoyG1sNw== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794049768; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: MIME-Version:Content-Type:Content-Transfer-Encoding; bh=zZzmI9S+paC5viBWuPYcRDfQvl6yYQe60afYUAh0Sd4=; b=GQAetu+j9CFsAbqK7SFCdtB8wCzk32XXtQ014l6GiTRS4m9J3FpDjCQn+GhML8ZPMpIb iJX+oA0OYL1xFsbg3wkLkV3UiBq92RVPeq3ipZQgUD3w9A47T2C/t72zaf/U5UR9CEhae jebkX0DjafV0of6psD9q+ZyBrzvsktZ14/N6ivh8jRigD0Yi1HugCNe5XN1ed1BFvJ3Ql XEhjseNuwIw50N3ChjCODLBv2eHybiaSG9E8OAM/UMj9mjaOJIzlav+vBXfHBXrwzXeOR u/zps8lq3redkfZiHJyl2h+PqFdeUUdPb2uAIESAXtxozF/CebZ5s3Gya3JNaQ3rk6g== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=AZLgDYSu; 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 D38F0606A326 for ; Sat, 7 Nov 2026 11:09:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=AZLgDYSu Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4EFF61F008A1; Sat, 7 Nov 2026 11:09:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794049767; bh=zZzmI9S+paC5viBWuPYcRDfQvl6yYQe60afYUAh0Sd4=; h=From:To:Cc:Subject:Date; b=AZLgDYSunuxyNH39fjJLKSzCcxnQrMaqrDmB4usNxMtrZDeukVtohr20Fy/ydSsTs RpAFkfjqGK6rZ4UxtGYMh5gnp1ltxOoOr4U8IIpon2J6dr8rbZrdI33PuJIxk6co2I c0Vzbn5uKWZlPGzOLz+H57AJZDxDMjvh5UxZe5zXOsu1Fr3+XV7BOtCy8spnTLwpBz 1HceW6JjrQgPNSC5OIrww+f7jwlGm8NN7dg1FnnapuwTwts7qXZP88gITf2n31m6sq JzMlipS4pf/2/yC6Po1PFD5aFOq7HFAZfRZa0VtDDCcYZzzT0ozdwhejWcaQVaTbGM ZsOJ1dGcNsLfw== From: Sasha Levin To: sahaj123.sc@gmail.com, bartosz.golaszewski@oss.qualcomm.com Cc: stable@vger.kernel.org Subject: FAILED: patch "[PATCH] gpio: pca953x: Handle direction register read errors in IRQ paths" failed to apply to 5.15-stable tree Date: Sat, 7 Nov 2026 06:09:26 -0500 Message-ID: <20261107060925-failed-5.15-a0fe26929350@kernel.org> X-Mailer: git-send-email 2.53.0 X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 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 . 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-5.15.y git checkout FETCH_HEAD git cherry-pick -x a0fe269293509acdd93b9cfb3f46636f7b91b33a # git commit -s git send-email --to '' --in-reply-to '20261107060925-failed-5.15-a0fe26929350@kernel.org' --subject-prefix 'PATCH 5.15.y' 'HEAD^..' Thanks, Sasha ------------------ original commit in Linus's tree ------------------ >From a0fe269293509acdd93b9cfb3f46636f7b91b33a Mon Sep 17 00:00:00 2001 From: Sahaj Chaudhari Date: Sun, 18 Oct 2026 22:20:03 +0530 Subject: [PATCH] gpio: pca953x: Handle direction register read errors in IRQ paths Three IRQ paths ignore the result of reading the direction registers and then use the destination bitmap. pca953x_read_regs() does not populate that bitmap when regmap_bulk_read() fails, leaving the callers to use uninitialized stack data. This can select incorrect GPIOs for direction changes during IRQ bus synchronization, corrupt the saved input state during IRQ setup, or produce incorrect pending interrupt decisions. Check the read result at all three sites. Release irq_lock without changing GPIO directions on failure, leave the IRQ history untouched when pending detection fails, and propagate the error from IRQ setup. The read helper already logs the error. Fixes: 0f25fda840a9 ("gpio: pca953x: Zap ad-hoc reg_direction cache") Cc: stable@vger.kernel.org Signed-off-by: Sahaj Chaudhari Link: https://patch.msgid.link/20261018165003.3372368-1-sahaj123.sc@gmail.com Signed-off-by: Bartosz Golaszewski --- drivers/gpio/gpio-pca953x.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c index 869ed4264d48a..afec5ec236968 100644 --- a/drivers/gpio/gpio-pca953x.c +++ b/drivers/gpio/gpio-pca953x.c @@ -867,6 +867,7 @@ static void pca953x_irq_bus_sync_unlock(struct irq_data *d) DECLARE_BITMAP(irq_mask, MAX_LINE); DECLARE_BITMAP(reg_direction, MAX_LINE); int level; + int ret; guard(mutex)(&chip->i2c_lock); @@ -885,7 +886,9 @@ static void pca953x_irq_bus_sync_unlock(struct irq_data *d) } /* Switch direction to input if needed */ - pca953x_read_regs(chip, chip->regs->direction, reg_direction); + ret = pca953x_read_regs(chip, chip->regs->direction, reg_direction); + if (ret) + goto out; bitmap_or(irq_mask, chip->irq_trig_fall, chip->irq_trig_raise, gc->ngpio); bitmap_or(irq_mask, irq_mask, chip->irq_trig_level_high, gc->ngpio); @@ -895,6 +898,7 @@ static void pca953x_irq_bus_sync_unlock(struct irq_data *d) for_each_andnot_bit(level, irq_mask, reg_direction, gc->ngpio) pca953x_gpio_direction_input_unlocked(&chip->gpio_chip, level); +out: mutex_unlock(&chip->irq_lock); } @@ -989,7 +993,9 @@ static bool pca953x_irq_pending(struct pca953x_chip *chip, unsigned long *pendin } /* Remove output pins from the equation */ - pca953x_read_regs(chip, chip->regs->direction, reg_direction); + ret = pca953x_read_regs(chip, chip->regs->direction, reg_direction); + if (ret) + return false; bitmap_copy(old_stat, chip->irq_stat, gc->ngpio); @@ -1089,7 +1095,9 @@ static int pca953x_irq_setup(struct pca953x_chip *chip, int irq_base) * interrupt. We have to rely on the previous read for * this purpose. */ - pca953x_read_regs(chip, chip->regs->direction, reg_direction); + ret = pca953x_read_regs(chip, chip->regs->direction, reg_direction); + if (ret) + return ret; bitmap_and(chip->irq_stat, irq_stat, reg_direction, gc->ngpio); mutex_init(&chip->irq_lock); -- 2.53.0