From patchwork Thu Apr 9 08:49:53 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hui Song X-Patchwork-Id: 11481463 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 98E0481 for ; Thu, 9 Apr 2020 09:04:20 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 751FF2083E for ; Thu, 9 Apr 2020 09:04:20 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="M0wz9c15" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 751FF2083E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=nxp.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To: References:List-Owner; bh=3W9Q7mxhCcTdMDCBjRd5W0oahSSJEUC1s0VxI7nk61s=; b=M0w z9c15DxVirtONnHXVFck04wjwKvICpoOzHXo58/t/YXO/0kfu0Znm266lAuaqhBdYYDDMo7sONLNw rF9CLYPtcBfI32JJgqITou96TvKMe/ze3/Ttt05Dn1Z1oTOFfrV0lvd62iEK4DkxcGeECoe9AV27s XBWjOapwSfm0TYsnyYPTI1S+rWK+X1EH4AzdZUs9R5WVoE/DedPB6eTwPkIEwP3c8ZGrtzlnp4q5O NhkN4+UXBpJ9z9pjgIVHrl1v/fTs1s8KJbix7cg5Hvsa+S+P0LgixKUTCc1nF1/eNKpuyGX9+g354 ti3lgh/p+UWrK+FfgJL0e7mXcJOOyHg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jMT6g-000241-KH; Thu, 09 Apr 2020 09:04:18 +0000 Received: from inva020.nxp.com ([92.121.34.13]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jMT6d-00023K-Ax for linux-arm-kernel@lists.infradead.org; Thu, 09 Apr 2020 09:04:16 +0000 Received: from inva020.nxp.com (localhost [127.0.0.1]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id 05A8B1A03EC; Thu, 9 Apr 2020 11:04:13 +0200 (CEST) Received: from invc005.ap-rdc01.nxp.com (invc005.ap-rdc01.nxp.com [165.114.16.14]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id 4D3B61A01DE; Thu, 9 Apr 2020 11:04:07 +0200 (CEST) Received: from titan.ap.freescale.net (titan.ap.freescale.net [10.192.208.233]) by invc005.ap-rdc01.nxp.com (Postfix) with ESMTP id 13F2840294; Thu, 9 Apr 2020 17:04:00 +0800 (SGT) From: Hui Song To: Shawn Guo , Li Yang , Rob Herring , Mark Rutland , Linus Walleij , Bartosz Golaszewski Subject: [PATCH] gpio: mpc8xxx: Add shutdown function. Date: Thu, 9 Apr 2020 16:49:53 +0800 Message-Id: <20200409084953.46265-1-hui.song_1@nxp.com> X-Mailer: git-send-email 2.9.5 X-Virus-Scanned: ClamAV using ClamSMTP X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200409_020415_518899_A440B84E X-CRM114-Status: UNSURE ( 9.07 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -2.3 (--) X-Spam-Report: SpamAssassin version 3.4.4 on bombadil.infradead.org summary: Content analysis details: (-2.3 points) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at https://www.dnswl.org/, medium trust [92.121.34.13 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, Song Hui , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org From: Song Hui When the kexec command is executed, the memory area will be re-paginated. The shutdown function needed to make interrupt handler to be NULL.If not, an interrupt will be generated during this period. When the interrupt handler is executed,the handler function address changed and crash will occur. Signed-off-by: Song Hui --- drivers/gpio/gpio-mpc8xxx.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/gpio/gpio-mpc8xxx.c b/drivers/gpio/gpio-mpc8xxx.c index 604dfec..a24e6c5 100644 --- a/drivers/gpio/gpio-mpc8xxx.c +++ b/drivers/gpio/gpio-mpc8xxx.c @@ -446,9 +446,21 @@ static int mpc8xxx_remove(struct platform_device *pdev) return 0; } +static int mpc8xxx_shutdown(struct platform_device *pdev) +{ + struct mpc8xxx_gpio_chip *mpc8xxx_gc = platform_get_drvdata(pdev); + + if (mpc8xxx_gc->irq) { + irq_set_chained_handler_and_data(mpc8xxx_gc->irqn, NULL, NULL); + irq_domain_remove(mpc8xxx_gc->irq); + } + + return 0; +} static struct platform_driver mpc8xxx_plat_driver = { .probe = mpc8xxx_probe, .remove = mpc8xxx_remove, + .shutdown = mpc8xxx_shutdown, .driver = { .name = "gpio-mpc8xxx", .of_match_table = mpc8xxx_gpio_ids,