From patchwork Tue Dec 1 06:45:23 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ken Xue X-Patchwork-Id: 7733191 Return-Path: X-Original-To: patchwork-linux-block@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 489D29F387 for ; Tue, 1 Dec 2015 07:06:48 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 466B9206AD for ; Tue, 1 Dec 2015 07:06:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 44B20206AB for ; Tue, 1 Dec 2015 07:06:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754537AbbLAHGp (ORCPT ); Tue, 1 Dec 2015 02:06:45 -0500 Received: from mail-bn1on0066.outbound.protection.outlook.com ([157.56.110.66]:55568 "EHLO na01-bn1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755165AbbLAHGn (ORCPT ); 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Tue, 1 Dec 2015 06:50:57 +0000 X-WSS-ID: 0NYO30U-08-HRP-02 X-M-MSG: Received: from satlvexedge02.amd.com (satlvexedge02.amd.com [10.177.96.29]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by atltwp02.amd.com (Axway MailGate 5.3.1) with ESMTPS id 23F1CD1A35E; Tue, 1 Dec 2015 01:50:53 -0500 (EST) Received: from SATLEXDAG06.amd.com (10.181.40.13) by SATLVEXEDGE02.amd.com (10.177.96.29) with Microsoft SMTP Server (TLS) id 14.3.195.1; Tue, 1 Dec 2015 00:51:08 -0600 Received: from SCYBEXDAG04.amd.com (10.34.11.14) by satlexdag06.amd.com (10.181.40.13) with Microsoft SMTP Server (TLS) id 14.3.266.1; Tue, 1 Dec 2015 01:50:55 -0500 Received: from [10.237.74.14] (10.237.74.14) by SCYBEXDAG04.amd.com (10.34.11.14) with Microsoft SMTP Server id 14.3.266.1; Tue, 1 Dec 2015 14:50:49 +0800 Message-ID: <1448952323.3603.17.camel@kxue-X58A-UD3R> Subject: [PATCH 1/2]Revert "SCSI: Fix NULL pointer dereference in runtime PM" From: Ken Xue To: , , , CC: , , , , , Date: Tue, 1 Dec 2015 14:45:23 +0800 X-Mailer: Evolution 3.10.4-0ubuntu2 MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-Forefront-Antispam-Report: CIP:165.204.84.222; 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Take sr device as example, when sr device goes to runtime suspend, blk_{pre|post}_runtime_suspend will be called since sr device defined pm->runtime_suspend. But blk_{pre|post}_runtime_resume will not be called since sr device doesn't have pm->runtime_resume. so, sr device can not resume correctly anymore. More discussion can be found from below link. http://marc.info/?l=linux-scsi&m=144163730531875&w=2 Signed-off-by: Ken Xue Acked-by: Alan Stern Cc: Xiangliang Yu Cc: James E.J. Bottomley Cc: Jens Axboe Cc: Michael Terry Cc: stable@vger.kernel.org --- drivers/scsi/scsi_pm.c | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/drivers/scsi/scsi_pm.c b/drivers/scsi/scsi_pm.c index e4b7998..459abe1 100644 --- a/drivers/scsi/scsi_pm.c +++ b/drivers/scsi/scsi_pm.c @@ -219,13 +219,13 @@ static int sdev_runtime_suspend(struct device *dev) struct scsi_device *sdev = to_scsi_device(dev); int err = 0; - if (pm && pm->runtime_suspend) { - err = blk_pre_runtime_suspend(sdev->request_queue); - if (err) - return err; + err = blk_pre_runtime_suspend(sdev->request_queue); + if (err) + return err; + if (pm && pm->runtime_suspend) err = pm->runtime_suspend(dev); - blk_post_runtime_suspend(sdev->request_queue, err); - } + blk_post_runtime_suspend(sdev->request_queue, err); + return err; } @@ -248,11 +248,11 @@ static int sdev_runtime_resume(struct device *dev) const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; int err = 0; - if (pm && pm->runtime_resume) { - blk_pre_runtime_resume(sdev->request_queue); + blk_pre_runtime_resume(sdev->request_queue); + if (pm && pm->runtime_resume) err = pm->runtime_resume(dev); - blk_post_runtime_resume(sdev->request_queue, err); - } + blk_post_runtime_resume(sdev->request_queue, err); + return err; }