From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 24628C2D0DB for ; Tue, 28 Jan 2020 14:09:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F057624692 for ; Tue, 28 Jan 2020 14:09:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1580220572; bh=WqVXmIRvyFjAUy1jnAt9rvJXSDa6ncQ2GiVB6cGIdiQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=etP7+Bo9U4HPU04jhy5XudttV202U5sZuSfZB664CSWfGFrIttWoyMG4+GjRam4D4 lF/ptViz19IfTKvemfZoECxjPDnNhBznB9vG/pKelVs7zQyjQG+bfJIzZHC5PH8DvA isUfivdr0uVFI5dU7Vvz32qV+v64QWJhewxAFb3U= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728901AbgA1OJb (ORCPT ); Tue, 28 Jan 2020 09:09:31 -0500 Received: from mail.kernel.org ([198.145.29.99]:57826 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727457AbgA1OJ1 (ORCPT ); Tue, 28 Jan 2020 09:09:27 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 77FE424685; Tue, 28 Jan 2020 14:09:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1580220567; bh=WqVXmIRvyFjAUy1jnAt9rvJXSDa6ncQ2GiVB6cGIdiQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=wmjy9WO/RSqMjtu5kQRjNKna0GFvtYQ2Kisa6MNWpDghasVM4S2m9tzHpr2DtME49 A/1Y8Ad8F8jWLSMFGLvIJWW0mFqEif0+qNfVSWuo6s2nlKI1myecO7hv1/iZJQXi3s I4S1jedP6IelTXiBiq3AgKdsBbmp9z0GKxsU0bbc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Steve Sistare , Sumit Saxena , "Martin K. Petersen" , Sasha Levin Subject: [PATCH 4.4 058/183] scsi: megaraid_sas: reduce module load time Date: Tue, 28 Jan 2020 15:04:37 +0100 Message-Id: <20200128135835.696517550@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200128135829.486060649@linuxfoundation.org> References: <20200128135829.486060649@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Steve Sistare [ Upstream commit 31b6a05f86e690e1818116fd23c3be915cc9d9ed ] megaraid_sas takes 1+ seconds to load while waiting for firmware: [2.822603] megaraid_sas 0000:03:00.0: Waiting for FW to come to ready state [3.871003] megaraid_sas 0000:03:00.0: FW now in Ready state This is due to the following loop in megasas_transition_to_ready(), which waits a minimum of 1 second, even though the FW becomes ready in tens of millisecs: /* * The cur_state should not last for more than max_wait secs */ for (i = 0; i < max_wait; i++) { ... msleep(1000); ... dev_info(&instance->pdev->dev, "FW now in Ready state\n"); This is a regression, caused by a change of the msleep granularity from 1 to 1000 due to concern about waiting too long on systems with coarse jiffies. To fix, increase iterations and use msleep(20), which results in: [2.670627] megaraid_sas 0000:03:00.0: Waiting for FW to come to ready state [2.739386] megaraid_sas 0000:03:00.0: FW now in Ready state Fixes: fb2f3e96d80f ("scsi: megaraid_sas: Fix msleep granularity") Signed-off-by: Steve Sistare Acked-by: Sumit Saxena Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/megaraid/megaraid_sas_base.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c index 7be968f60b590..1efd876f0728c 100644 --- a/drivers/scsi/megaraid/megaraid_sas_base.c +++ b/drivers/scsi/megaraid/megaraid_sas_base.c @@ -3585,12 +3585,12 @@ megasas_transition_to_ready(struct megasas_instance *instance, int ocr) /* * The cur_state should not last for more than max_wait secs */ - for (i = 0; i < max_wait; i++) { + for (i = 0; i < max_wait * 50; i++) { curr_abs_state = instance->instancet-> read_fw_status_reg(instance->reg_set); if (abs_state == curr_abs_state) { - msleep(1000); + msleep(20); } else break; } -- 2.20.1