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Mon, 6 Nov 2023 23:13:12 +0000 Received: from CY8PR10MB7243.namprd10.prod.outlook.com ([fe80::449f:4fd9:2d3e]) by CY8PR10MB7243.namprd10.prod.outlook.com ([fe80::449f:4fd9:2d3e%4]) with mapi id 15.20.6954.028; Mon, 6 Nov 2023 23:13:12 +0000 From: Mike Christie To: mwilck@suse.com, bvanassche@acm.org, hch@lst.de, martin.petersen@oracle.com, linux-scsi@vger.kernel.org, james.bottomley@hansenpartnership.com Cc: Mike Christie Subject: [PATCH 1/1] scsi: sd: Fix sshdr use in sd_suspend_common Date: Mon, 6 Nov 2023 17:13:04 -0600 Message-Id: <20231106231304.5694-2-michael.christie@oracle.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231106231304.5694-1-michael.christie@oracle.com> References: <20231106231304.5694-1-michael.christie@oracle.com> X-ClientProxiedBy: DS7PR03CA0030.namprd03.prod.outlook.com (2603:10b6:5:3b8::35) To CY8PR10MB7243.namprd10.prod.outlook.com (2603:10b6:930:7c::10) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY8PR10MB7243:EE_|BL3PR10MB6161:EE_ X-MS-Office365-Filtering-Correlation-Id: ad66c36e-738e-43d4-c902-08dbdf1df2eb X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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If it returns 0, then the cmd executed successfully, so there is no need to check the sshdr. sd_sync_cache will only access the sshdr if it's been setup because it calls scsi_status_is_check_condition before accessing it. However, the sd_sync_cache caller, sd_suspend_common, does not check. sd_suspend_common is only checking for ILLEGAL_REQUEST which it's using to determine if the command is supported. If it's not it just ignores the error. So to fix its sshdr use this patch just moves that check to sd_sync_cache where it converts ILLEGAL_REQUEST to success/0. sd_suspend_common was ignoring that error and sd_shutdown doesn't check for errors so there will be no behavior changes. Signed-off-by: Mike Christie Reviewed-by: Christoph Hellwig Reviewed-by: Martin Wilck Reviewed-by: Bart Van Assche Reviewed-by: Christoph Hellwig --- drivers/scsi/sd.c | 53 ++++++++++++++++++++--------------------------- 1 file changed, 23 insertions(+), 30 deletions(-) diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 530918cbfce2..fa00dd503cbf 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -1643,24 +1643,21 @@ static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing) return disk_changed ? DISK_EVENT_MEDIA_CHANGE : 0; } -static int sd_sync_cache(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr) +static int sd_sync_cache(struct scsi_disk *sdkp) { int retries, res; struct scsi_device *sdp = sdkp->device; const int timeout = sdp->request_queue->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER; - struct scsi_sense_hdr my_sshdr; + struct scsi_sense_hdr sshdr; const struct scsi_exec_args exec_args = { .req_flags = BLK_MQ_REQ_PM, - /* caller might not be interested in sense, but we need it */ - .sshdr = sshdr ? : &my_sshdr, + .sshdr = &sshdr, }; if (!scsi_device_online(sdp)) return -ENODEV; - sshdr = exec_args.sshdr; - for (retries = 3; retries > 0; --retries) { unsigned char cmd[16] = { 0 }; @@ -1685,15 +1682,23 @@ static int sd_sync_cache(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr) return res; if (scsi_status_is_check_condition(res) && - scsi_sense_valid(sshdr)) { - sd_print_sense_hdr(sdkp, sshdr); + scsi_sense_valid(&sshdr)) { + sd_print_sense_hdr(sdkp, &sshdr); /* we need to evaluate the error return */ - if (sshdr->asc == 0x3a || /* medium not present */ - sshdr->asc == 0x20 || /* invalid command */ - (sshdr->asc == 0x74 && sshdr->ascq == 0x71)) /* drive is password locked */ + if (sshdr.asc == 0x3a || /* medium not present */ + sshdr.asc == 0x20 || /* invalid command */ + (sshdr.asc == 0x74 && sshdr.ascq == 0x71)) /* drive is password locked */ /* this is no error here */ return 0; + /* + * This drive doesn't support sync and there's not much + * we can do because this is called during shutdown + * or suspend so just return success so those operations + * can proceed. + */ + if (sshdr.sense_key == ILLEGAL_REQUEST) + return 0; } switch (host_byte(res)) { @@ -3853,7 +3858,7 @@ static void sd_shutdown(struct device *dev) if (sdkp->WCE && sdkp->media_present) { sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); - sd_sync_cache(sdkp, NULL); + sd_sync_cache(sdkp); } if ((system_state != SYSTEM_RESTART && @@ -3874,7 +3879,6 @@ static inline bool sd_do_start_stop(struct scsi_device *sdev, bool runtime) static int sd_suspend_common(struct device *dev, bool runtime) { struct scsi_disk *sdkp = dev_get_drvdata(dev); - struct scsi_sense_hdr sshdr; int ret = 0; if (!sdkp) /* E.g.: runtime suspend following sd_remove() */ @@ -3883,24 +3887,13 @@ static int sd_suspend_common(struct device *dev, bool runtime) if (sdkp->WCE && sdkp->media_present) { if (!sdkp->device->silence_suspend) sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); - ret = sd_sync_cache(sdkp, &sshdr); - - if (ret) { - /* ignore OFFLINE device */ - if (ret == -ENODEV) - return 0; - - if (!scsi_sense_valid(&sshdr) || - sshdr.sense_key != ILLEGAL_REQUEST) - return ret; + ret = sd_sync_cache(sdkp); + /* ignore OFFLINE device */ + if (ret == -ENODEV) + return 0; - /* - * sshdr.sense_key == ILLEGAL_REQUEST means this drive - * doesn't support sync. There's not much to do and - * suspend shouldn't fail. - */ - ret = 0; - } + if (ret) + return ret; } if (sd_do_start_stop(sdkp->device, runtime)) {