From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752186AbeAZQeD (ORCPT ); Fri, 26 Jan 2018 11:34:03 -0500 Received: from mail-pf0-f193.google.com ([209.85.192.193]:43870 "EHLO mail-pf0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752041AbeAZQeA (ORCPT ); Fri, 26 Jan 2018 11:34:00 -0500 X-Google-Smtp-Source: AH8x225K6ArO1zeRGeKNfYdaPubK2eRw7DdlLsYblmUM8wMFF2TsVBo8FyA+qfk935v27HufKBqaOw== From: Jia-Ju Bai To: Larry.Finger@lwfinger.net, kvalo@codeaurora.org, zajec5@gmail.com Cc: linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, Jia-Ju Bai Subject: [PATCH v2] bcma: Replace mdelay with usleep_range in bcma_pmu_resources_init Date: Sat, 27 Jan 2018 00:38:35 +0800 Message-Id: <1516984715-9237-1-git-send-email-baijiaju1990@gmail.com> X-Mailer: git-send-email 1.7.9.5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org After checking all possible call chains to bcma_pmu_resources_init() here, my tool finds that this function is never called in atomic context, namely never in an interrupt handler or holding a spinlock. Thus mdelay can be replaced with usleep_range to avoid busy wait. This is found by a static analysis tool named DCNS written by myself. Signed-off-by: Jia-Ju Bai --- v2: * Use usleep_range(2000, 2500), instead of (1500, 2000) in v1. --- drivers/bcma/driver_chipcommon_pmu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/bcma/driver_chipcommon_pmu.c b/drivers/bcma/driver_chipcommon_pmu.c index f1eb4d3..478948c 100644 --- a/drivers/bcma/driver_chipcommon_pmu.c +++ b/drivers/bcma/driver_chipcommon_pmu.c @@ -203,7 +203,7 @@ static void bcma_pmu_resources_init(struct bcma_drv_cc *cc) * Add some delay; allow resources to come up and settle. * Delay is required for SoC (early init). */ - mdelay(2); + usleep_range(2000, 2500); } /* Disable to allow reading SPROM. Don't know the adventages of enabling it. */ -- 1.7.9.5