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 C234D448D11; Wed, 23 Sep 2026 14:44:38 +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=1790174679; cv=none; b=OcNPf0WPDh+Mb/lnrqO/UvCEg3ItEpzCTVDriKP65lTKXcyQ6oKdCMlgpYeQY3WHEvgXej7Rxq3uSzKFyR5UjqUBhZsO78hc+IYtPq0SilHzym+9yVzIfEzKCwa6BRzs5FsDZMw/h0HSyiigAGEQot5HleRt7ohQ1bmD93vvaK0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790174679; c=relaxed/simple; bh=SugNr9Av+bPanC8YoHunPL3/6cJAzL/rUi9H5gtoOhA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=jheQmGmwU2vBPclPi43Gr+0EbuNcKKeCQjBaF9ozxrmrI+CDfk/S140D/fGTdaUzoLkg5zwgzY1yRzJnYyxkF+8nReFpQZ+i2w0wRPYFqRgYRKuYfRvqgJ+plurrR3TxbEVGrjbtcTjonRRUU00oL4xneJQkSpblnLtBmmEI+DI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ePksrK01; 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="ePksrK01" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DA0E21F000FF; Wed, 23 Sep 2026 14:44:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790174678; bh=nVLaTtXesJs9SIm3ROvGgPqY+idFBma6+JwxU/wxDBs=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=ePksrK01QIkJjheZD4JpV+o0FHS457weTXG9hy9oYPSm95Q5H90kq3mPClktRoYDc 8FVR7tyXCLm9MchwhERQ97WXw4Ob04YaLHRxNq9/NZ3TTRHweStjCHBtitA8XTCOop HmkkvaeeBlUKAz23H6+NqAndINYcoSTQuchRlhDU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Sashiko AI review , Cong Nguyen , Guenter Roeck , Sasha Levin Subject: [PATCH 6.18 191/398] hwmon: (gpio-fan) return IRQ_HANDLED from the shared alarm IRQ handler Date: Wed, 23 Sep 2026 16:04:25 +0200 Message-ID: <20260923140648.378775497@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260923140643.441954610@linuxfoundation.org> References: <20260923140643.441954610@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Cong Nguyen [ Upstream commit bdf5f731957de48acada392f28e82bc019713adb ] fan_alarm_irq_handler() always schedules alarm_work but returns IRQ_NONE, so the kernel treats every alarm interrupt as unhandled. On a shared line that risks the whole line being disabled as spurious. v1 just fixed that, but it was still IRQF_SHARED, and always returning IRQ_HANDLED there defeats spurious-interrupt detection for the line -- if the interrupt ever fires without a real event, nothing catches it, and a fault could spin the CPU in the handler. Sashiko flagged this in v1, and Guenter confirmed: this interrupt must not be shared. So v2 drops IRQF_SHARED too. Fixes: d6fe1360f42e ("hwmon: add generic GPIO fan driver") Reported-by: Sashiko AI review Link: https://lore.kernel.org/r/20260901160931.DD3811F00A3D@smtp.kernel.org Assisted-by: Claude:claude-opus-4 Signed-off-by: Cong Nguyen Link: https://patch.msgid.link/20260914104136.1797979-1-congnt264@gmail.com Signed-off-by: Guenter Roeck Signed-off-by: Sasha Levin --- drivers/hwmon/gpio-fan.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/hwmon/gpio-fan.c b/drivers/hwmon/gpio-fan.c index ea5ca2dea2a99..1dfc02df9bbb0 100644 --- a/drivers/hwmon/gpio-fan.c +++ b/drivers/hwmon/gpio-fan.c @@ -68,7 +68,7 @@ static irqreturn_t fan_alarm_irq_handler(int irq, void *dev_id) schedule_work(&fan_data->alarm_work); - return IRQ_NONE; + return IRQ_HANDLED; } static ssize_t fan1_alarm_show(struct device *dev, @@ -103,7 +103,7 @@ static int fan_alarm_init(struct gpio_fan_data *fan_data) irq_set_irq_type(alarm_irq, IRQ_TYPE_EDGE_BOTH); return devm_request_irq(dev, alarm_irq, fan_alarm_irq_handler, - IRQF_SHARED, "GPIO fan alarm", fan_data); + 0, "GPIO fan alarm", fan_data); } /* -- 2.53.0