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 X-Spam-Level: X-Spam-Status: No, score=-20.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, 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=ham 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 4099DC07E9D for ; Mon, 19 Jul 2021 16:10:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 26BDC6141C for ; Mon, 19 Jul 2021 16:10:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346658AbhGSP3j (ORCPT ); Mon, 19 Jul 2021 11:29:39 -0400 Received: from mail.kernel.org ([198.145.29.99]:46560 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346127AbhGSP1V (ORCPT ); Mon, 19 Jul 2021 11:27:21 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 067DA6113A; Mon, 19 Jul 2021 16:08:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1626710881; bh=NgYf5L9KJ6SIP4AvYq7HiB5s461VQyuNZ2Hi21ZO2Q4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=1iAt3VtRmy2T93xGEjF4+GUa8Cwi1xNzofiY6aXetFURtoAlJn1jizXJkH4BL8JHA 3dJyH9Qvp7qJmRm7AoS6KE2A9HDxm+bX+5OAIy0wpTj6BCc4gZsR/moxingPk9lizH cXu7oGq3X/F96AHu0Fy02WoX7GIi0UQ69ngfjs4A= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, kernel test robot , Stephen Boyd , Dmitry Torokhov , Wolfram Sang , Sasha Levin Subject: [PATCH 5.13 144/351] i2c: core: Disable client irq on reboot/shutdown Date: Mon, 19 Jul 2021 16:51:30 +0200 Message-Id: <20210719144949.243281585@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210719144944.537151528@linuxfoundation.org> References: <20210719144944.537151528@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Dmitry Torokhov [ Upstream commit b64210f2f7c11c757432ba3701d88241b2b98fb1 ] If an i2c client receives an interrupt during reboot or shutdown it may be too late to service it by making an i2c transaction on the bus because the i2c controller has already been shutdown. This can lead to system hangs if the i2c controller tries to make a transfer that is doomed to fail because the access to the i2c pins is already shut down, or an iommu translation has been torn down so i2c controller register access doesn't work. Let's simply disable the irq if there isn't a shutdown callback for an i2c client when there is an irq associated with the device. This will make sure that irqs don't come in later than the time that we can handle it. We don't do this if the i2c client device already has a shutdown callback because presumably they're doing the right thing and quieting the device so irqs don't come in after the shutdown callback returns. Reported-by: kernel test robot [swboyd@chromium.org: Dropped newline, added commit text, added interrupt.h for robot build error] Signed-off-by: Stephen Boyd Signed-off-by: Dmitry Torokhov Signed-off-by: Wolfram Sang Signed-off-by: Sasha Levin --- drivers/i2c/i2c-core-base.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c index 5a97e4a02fa2..e314ccaf114a 100644 --- a/drivers/i2c/i2c-core-base.c +++ b/drivers/i2c/i2c-core-base.c @@ -24,6 +24,7 @@ #include #include #include +#include #include #include #include @@ -627,6 +628,8 @@ static void i2c_device_shutdown(struct device *dev) driver = to_i2c_driver(dev->driver); if (driver->shutdown) driver->shutdown(client); + else if (client->irq > 0) + disable_irq(client->irq); } static void i2c_client_dev_release(struct device *dev) -- 2.30.2