From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754214AbaLJJzW (ORCPT ); Wed, 10 Dec 2014 04:55:22 -0500 Received: from mailgw02.mediatek.com ([210.61.82.184]:53478 "EHLO mailgw02.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1751520AbaLJJzQ (ORCPT ); Wed, 10 Dec 2014 04:55:16 -0500 X-Listener-Flag: 11101 From: Yingjoe Chen To: Thomas Gleixner , Beniamino Galvani , Jason Cooper CC: Marc Zyngier , , , , , Matthias Brugger , , Sascha Hauer , , , , Yingjoe Chen Subject: [PATCH v2] irqchip: mediatek: Use IS_ERR() instead of NULL pointer check Date: Wed, 10 Dec 2014 17:55:02 +0800 Message-ID: <1418205302-22531-1-git-send-email-yingjoe.chen@mediatek.com> X-Mailer: git-send-email 1.8.1.1.dirty In-Reply-To: <1418050989-21411-1-git-send-email-yingjoe.chen@mediatek.com> References: <1418050989-21411-1-git-send-email-yingjoe.chen@mediatek.com> MIME-Version: 1.0 Content-Type: text/plain X-MTK: N Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Beniamino reported a kernel oops caused by an invalid DT file for the mediatek interrupt polarity extension. The reason is that the interrupt polarity support for mediatek chips merely checks for NULL pointer instead of a casted error return value in mtk_sysirq_of_init() so any other casted error value passes the NULL pointer check and causes a kernel panic when dereferenced. Use IS_ERR() and return the error value via PTR_ERR(). Reported-and-tested-by: Beniamino Galvani Signed-off-by: Yingjoe Chen --- drivers/irqchip/irq-mtk-sysirq.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/irqchip/irq-mtk-sysirq.c b/drivers/irqchip/irq-mtk-sysirq.c index 7e342df..0b0d2c0 100644 --- a/drivers/irqchip/irq-mtk-sysirq.c +++ b/drivers/irqchip/irq-mtk-sysirq.c @@ -137,9 +137,9 @@ static int __init mtk_sysirq_of_init(struct device_node *node, return -ENOMEM; chip_data->intpol_base = of_io_request_and_map(node, 0, "intpol"); - if (!chip_data->intpol_base) { + if (IS_ERR(chip_data->intpol_base)) { pr_err("mtk_sysirq: unable to map sysirq register\n"); - ret = -ENOMEM; + ret = PTR_ERR(chip_data->intpol_base); goto out_free; } -- 1.8.1.1.dirty