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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 8FC8BC33CB6 for ; Thu, 16 Jan 2020 18:11:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6B1B52073A for ; Thu, 16 Jan 2020 18:11:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579198290; bh=2bFgijao3BjFyOFfEF49GBzsZiQiiAZ9q+bM03fvtnQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=fEueJfKMVXEawMhA3I89LNtKFjmv7lJBLlZElso1uE+vgCAyPWt4pulPXDc7X00nD R/EdUYZ+w5imTw22Q+j64LpHVtgckt9vitYWDHYIyE/rgvIUAbTbdsP3Th4PKfOd8/ YdN1m1OamTZCOb9NWZ0F+GeNi3mbGM5ngAWo8hdg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2395100AbgAPSL2 (ORCPT ); Thu, 16 Jan 2020 13:11:28 -0500 Received: from mail.kernel.org ([198.145.29.99]:53428 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2405452AbgAPRhu (ORCPT ); Thu, 16 Jan 2020 12:37:50 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 83892246DC; Thu, 16 Jan 2020 17:37:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579196270; bh=2bFgijao3BjFyOFfEF49GBzsZiQiiAZ9q+bM03fvtnQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mTYBnMo2frmmlV13F0Nv1XXG+84q2QBA+zNBRvk2n47yW0fw6qNBevhtqeGHtRWjr nGxXel45sOoNfTieF9wF9GGz6HvPQ9D4SprnAZX+b+zMFqWf4bcru69IzxUKe3Z2Qh 38oCfcohBldkmNKFFj3OxPvLri/+cB/+U+intgSU= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Steve Sistare , Sumit Saxena , "Martin K . Petersen" , Sasha Levin , megaraidlinux.pdl@broadcom.com, linux-scsi@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 092/251] scsi: megaraid_sas: reduce module load time Date: Thu, 16 Jan 2020 12:34:01 -0500 Message-Id: <20200116173641.22137-52-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200116173641.22137-1-sashal@kernel.org> References: <20200116173641.22137-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@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 c5cc002dfdd5..10ae624dd266 100644 --- a/drivers/scsi/megaraid/megaraid_sas_base.c +++ b/drivers/scsi/megaraid/megaraid_sas_base.c @@ -3694,12 +3694,12 @@ 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