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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DBBFBC433F5 for ; Tue, 5 Apr 2022 14:31:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1387284AbiDEOb3 (ORCPT ); Tue, 5 Apr 2022 10:31:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39958 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240440AbiDEJe1 (ORCPT ); Tue, 5 Apr 2022 05:34:27 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5168684EF6; Tue, 5 Apr 2022 02:23:57 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 5049AB81C69; Tue, 5 Apr 2022 09:23:56 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 90346C385A4; Tue, 5 Apr 2022 09:23:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1649150634; bh=q6y2/6h1VVSs/fCO23TCYlJkU4HL9siqv9Gt+YyZhSE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=T0RhU76ExIkJ9unNrgVngw07Eg35RfOibXdeXTvt8OHrgX/5CEzgc87ixq322AP4c pBkDbyX6P/0xrmUMCTlRkHTxydO2SGCcSOozBLptnqlFx5R8LKe2yW/aE485RpTZO2 XrVIaaNHY4NLw7LBhljpZk3lvKph0IFEAqKtdWL0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Adrian Hunter , "Martin K. Petersen" Subject: [PATCH 5.15 087/913] scsi: core: sd: Add silence_suspend flag to suppress some PM messages Date: Tue, 5 Apr 2022 09:19:09 +0200 Message-Id: <20220405070342.430963969@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220405070339.801210740@linuxfoundation.org> References: <20220405070339.801210740@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Adrian Hunter commit af4edb1d50c6d1044cb34bc43621411b7ba2cffe upstream. Kernel messages produced during runtime PM can cause a never-ending cycle because user space utilities (e.g. journald or rsyslog) write the messages back to storage, causing runtime resume, more messages, and so on. Messages that tell of things that are expected to happen are arguably unnecessary, so add a flag to suppress them. This flag is used by the UFS driver. Link: https://lore.kernel.org/r/20220228113652.970857-2-adrian.hunter@intel.com Cc: stable@vger.kernel.org Signed-off-by: Adrian Hunter Signed-off-by: Martin K. Petersen Signed-off-by: Greg Kroah-Hartman --- drivers/scsi/scsi_error.c | 9 +++++++-- drivers/scsi/sd.c | 6 ++++-- include/scsi/scsi_device.h | 1 + 3 files changed, 12 insertions(+), 4 deletions(-) --- a/drivers/scsi/scsi_error.c +++ b/drivers/scsi/scsi_error.c @@ -485,8 +485,13 @@ static void scsi_report_sense(struct scs if (sshdr->asc == 0x29) { evt_type = SDEV_EVT_POWER_ON_RESET_OCCURRED; - sdev_printk(KERN_WARNING, sdev, - "Power-on or device reset occurred\n"); + /* + * Do not print message if it is an expected side-effect + * of runtime PM. + */ + if (!sdev->silence_suspend) + sdev_printk(KERN_WARNING, sdev, + "Power-on or device reset occurred\n"); } if (sshdr->asc == 0x2a && sshdr->ascq == 0x01) { --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -3628,7 +3628,8 @@ static int sd_suspend_common(struct devi return 0; if (sdkp->WCE && sdkp->media_present) { - sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); + if (!sdkp->device->silence_suspend) + sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); ret = sd_sync_cache(sdkp, &sshdr); if (ret) { @@ -3650,7 +3651,8 @@ static int sd_suspend_common(struct devi } if (sdkp->device->manage_start_stop) { - sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); + if (!sdkp->device->silence_suspend) + sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); /* an error is not worth aborting a system sleep */ ret = sd_start_stop_device(sdkp, 0); if (ignore_stop_errors) --- a/include/scsi/scsi_device.h +++ b/include/scsi/scsi_device.h @@ -206,6 +206,7 @@ struct scsi_device { unsigned rpm_autosuspend:1; /* Enable runtime autosuspend at device * creation time */ unsigned ignore_media_change:1; /* Ignore MEDIA CHANGE on resume */ + unsigned silence_suspend:1; /* Do not print runtime PM related messages */ bool offline_already; /* Device offline message logged */