From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 04E46C433F5 for ; Tue, 18 Jan 2022 03:17:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347623AbiARDRX (ORCPT ); Mon, 17 Jan 2022 22:17:23 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39100 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346680AbiARDJA (ORCPT ); Mon, 17 Jan 2022 22:09:00 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BC616C06175F; Mon, 17 Jan 2022 18:51:36 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 5972961346; Tue, 18 Jan 2022 02:51:36 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B34CEC36AEF; Tue, 18 Jan 2022 02:51:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1642474295; bh=mt14UD5wwUsEVPzv/slcZn+yEj+oYq8IMyN2ZD3IgCw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OPo4NdP//Mb/q2CjpD0SJMa2bxSuuawiq+J3svp10euBFCaGtsjfPWoe1KCDAJ1mg 42+D/2/3MG/xK0aE76C9f4qN0iPzZiA66I4UamHRFHnsahGKJZJYusPbmcowqtMbMG XjkVhWLDDnasA8mZKS7+2CafjufzQRH0tOf8dmLuy44962Woid53CjLXtzBk3Do0Ke Z44b3LioOsZ+i4MaiisM/MvBfbO4QB/yu7qUHV7ZbQKlD4zO5eVAcogNp1c0jX2uKx 4UfeGIsuBhQolax8/ACEvH6oiyMfJBwR1UMnhFX5oIhoR9UjyYzWucotUs67Rq3Q+Q UcE3ogFjREMrg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Hans de Goede , Andy Shevchenko , Sasha Levin , mika.westerberg@linux.intel.com, linus.walleij@linaro.org, brgl@bgdev.pl, linux-gpio@vger.kernel.org, linux-acpi@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 08/33] gpiolib: acpi: Do not set the IRQ type if the IRQ is already in use Date: Mon, 17 Jan 2022 21:50:50 -0500 Message-Id: <20220118025116.1954375-8-sashal@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220118025116.1954375-1-sashal@kernel.org> References: <20220118025116.1954375-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org From: Hans de Goede [ Upstream commit bdfd6ab8fdccd8b138837efff66f4a1911496378 ] If the IRQ is already in use, then acpi_dev_gpio_irq_get_by() really should not change the type underneath the current owner. I specifically hit an issue with this an a Chuwi Hi8 Super (CWI509) Bay Trail tablet, when the Boot OS selection in the BIOS is set to Android. In this case _STA for a MAX17047 ACPI I2C device wrongly returns 0xf and the _CRS resources for this device include a GpioInt pointing to a GPIO already in use by an _AEI handler, with a different type then specified in the _CRS for the MAX17047 device. Leading to the acpi_dev_gpio_irq_get() call done by the i2c-core-acpi.c code changing the type breaking the _AEI handler. Now this clearly is a bug in the DSDT of this tablet (in Android mode), but in general calling irq_set_irq_type() on an IRQ which already is in use seems like a bad idea. Signed-off-by: Hans de Goede Signed-off-by: Andy Shevchenko Signed-off-by: Sasha Levin --- drivers/gpio/gpiolib-acpi.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c index 986248f7011aa..c479280590e42 100644 --- a/drivers/gpio/gpiolib-acpi.c +++ b/drivers/gpio/gpiolib-acpi.c @@ -675,10 +675,17 @@ int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index) irq_flags = acpi_dev_get_irq_type(info.triggering, info.polarity); - /* Set type if specified and different than the current one */ - if (irq_flags != IRQ_TYPE_NONE && - irq_flags != irq_get_trigger_type(irq)) - irq_set_irq_type(irq, irq_flags); + /* + * If the IRQ is not already in use then set type + * if specified and different than the current one. + */ + if (can_request_irq(irq, irq_flags)) { + if (irq_flags != IRQ_TYPE_NONE && + irq_flags != irq_get_trigger_type(irq)) + irq_set_irq_type(irq, irq_flags); + } else { + dev_dbg(&adev->dev, "IRQ %d already in use\n", irq); + } return irq; } -- 2.34.1