From patchwork Mon Dec 28 12:47:03 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 354762 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7C9DDC43332 for ; Mon, 28 Dec 2020 14:51:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4DED720867 for ; Mon, 28 Dec 2020 14:51:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2502106AbgL1OTh (ORCPT ); Mon, 28 Dec 2020 09:19:37 -0500 Received: from mail.kernel.org ([198.145.29.99]:54902 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2502107AbgL1OTg (ORCPT ); Mon, 28 Dec 2020 09:19:36 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 6D010206D4; Mon, 28 Dec 2020 14:18:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1609165136; bh=yc0hZNOKlgsQGCmuGr8ozOHMQXfNzGnkzwNI4C/Z3u8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SdwNaWXAYSKN5J78uzaDbT/eFti07rrfaGQxINmI1uDLMDZlj2IY9pY1ThqFAvJOp inLMKxH0ACVrb/aIXMpXT1cyz+FAjVLyXrioWJTqp/K1tlQEifDqWpeetH57r9O9vL e3TI3TgFnwnfDIYCf5vj5S6Yzo1Xis0Wmdy/YRWQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Nikita Shubin , Linus Walleij , Sasha Levin Subject: [PATCH 5.10 425/717] gpiolib: irq hooks: fix recursion in gpiochip_irq_unmask Date: Mon, 28 Dec 2020 13:47:03 +0100 Message-Id: <20201228125041.326234535@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201228125020.963311703@linuxfoundation.org> References: <20201228125020.963311703@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Nikita Shubin [ Upstream commit 9d5522199505c761575c8ea31dcfd9a2a8d73614 ] irqchip shared with multiple gpiochips, leads to recursive call of gpiochip_irq_mask/gpiochip_irq_unmask which was assigned to rqchip->irq_mask/irqchip->irq_unmask, these happens becouse of only irqchip->irq_enable == gpiochip_irq_enable is checked. Let's add an additional check to make sure shared irqchip is detected even if irqchip->irq_enable wasn't defined. Fixes: a8173820f441 ("gpio: gpiolib: Allow GPIO IRQs to lazy disable") Signed-off-by: Nikita Shubin Link: https://lore.kernel.org/r/20201210070514.13238-1-nikita.shubin@maquefel.me Signed-off-by: Linus Walleij Signed-off-by: Sasha Levin --- drivers/gpio/gpiolib.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 6e3c4d7a7d146..4ad3c4b276dcf 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -1477,7 +1477,8 @@ static void gpiochip_set_irq_hooks(struct gpio_chip *gc) if (WARN_ON(gc->irq.irq_enable)) return; /* Check if the irqchip already has this hook... */ - if (irqchip->irq_enable == gpiochip_irq_enable) { + if (irqchip->irq_enable == gpiochip_irq_enable || + irqchip->irq_mask == gpiochip_irq_mask) { /* * ...and if so, give a gentle warning that this is bad * practice.