Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S938264AbdLRWYv (ORCPT ); Mon, 18 Dec 2017 17:24:51 -0500 Received: from mail.free-electrons.com ([62.4.15.54]:37316 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S935427AbdLRWYs (ORCPT ); Mon, 18 Dec 2017 17:24:48 -0500 Date: Mon, 18 Dec 2017 23:24:36 +0100 From: Alexandre Belloni To: Jia-Ju Bai Cc: akinobu.mita@gmail.com, a.zummo@towertech.it, linux-rtc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/2] rtc-r7301: Fix a possible sleep-in-atomic bug in rtc7301_read_time Message-ID: <20171218222436.GI15162@piout.net> References: <1513173350-18385-1-git-send-email-baijiaju1990@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1513173350-18385-1-git-send-email-baijiaju1990@gmail.com> User-Agent: Mutt/1.9.1 (2017-09-22) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 638 Lines: 22 On 13/12/2017 at 21:55:50 +0800, Jia-Ju Bai wrote: > The driver may sleep under a spinlock. > The function call path is: > rtc7301_read_time (acquire the spinlock) > rtc7301_wait_while_busy > usleep_range --> may sleep > > To fix it, usleep_range is replaced with udelay. > > This bug is found by my static analysis tool(DSAC) and checked by my code review. > > Signed-off-by: Jia-Ju Bai > --- > drivers/rtc/rtc-r7301.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > Applied, thanks. -- Alexandre Belloni, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com