Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752690AbdLLMg4 (ORCPT ); Tue, 12 Dec 2017 07:36:56 -0500 Received: from mail-pf0-f195.google.com ([209.85.192.195]:44318 "EHLO mail-pf0-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752296AbdLLMgy (ORCPT ); Tue, 12 Dec 2017 07:36:54 -0500 X-Google-Smtp-Source: ACJfBotsEw8zmaBQpE9UCgL7/TpI2rW1rZjk1gcy5jfAzAIR3Vkmk7SMHT24M6++EpScM6JJbhy/HQ== From: Jia-Ju Bai Subject: [BUG] vme_ca91cx42: a possible sleep-in-atomic bug in ca91cx42_master_set To: martyn@welchs.me.uk, manohar.vanga@gmail.com, gregkh@linuxfoundation.org, elfring@users.sourceforge.net, augustocaringi@gmail.com Cc: devel@driverdev.osuosl.org, Linux Kernel Mailing List Message-ID: Date: Tue, 12 Dec 2017 20:36:41 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.2.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 390 Lines: 14 According to drivers/vme/bridges/vme_ca91cx42.c, the driver may sleep under a spinlock. The function call path is: ca91cx42_master_set (acquire the spinlock) ca91cx42_alloc_resource ioremap_nocache --> may sleep I do not find a good way to fix it, so I only report. This possible bug is found by my static analysis tool (DSAC) and checked by my code review. Thanks, Jia-Ju Bai