On 10/4/23 23:30, gregkh@linuxfoundation.org wrote:
The patch below does not apply to the 6.1-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y git checkout FETCH_HEAD git cherry-pick -x 99398d2070ab03d13f90b758ad397e19a65fffb0 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2023100438-oblivion-stowing-20c5@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^..
Possible dependencies:
commit 3cc2ffe5c16dc65dfac354bc5b5bc98d3b397567
scsi: sd: Differentiate system and runtime start/stop management
is missing, which is why this backport fails. Same for 5.15 and 5.10 failures. We need to add that patch as well (and all the patches related to suspend/resume from the last rc4 libata PR). Should I prepare a series for the backport ?
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 99398d2070ab03d13f90b758ad397e19a65fffb0 Mon Sep 17 00:00:00 2001 From: Damien Le Moal dlemoal@kernel.org Date: Fri, 8 Sep 2023 17:03:15 +0900 Subject: [PATCH] scsi: sd: Do not issue commands to suspended disks on shutdown
If an error occurs when resuming a host adapter before the devices attached to the adapter are resumed, the adapter low level driver may remove the scsi host, resulting in a call to sd_remove() for the disks of the host. This in turn results in a call to sd_shutdown() which will issue a synchronize cache command and a start stop unit command to spindown the disk. sd_shutdown() issues the commands only if the device is not already runtime suspended but does not check the power state for system-wide suspend/resume. That is, the commands may be issued with the device in a suspended state, which causes PM resume to hang, forcing a reset of the machine to recover.
Fix this by tracking the suspended state of a disk by introducing the suspended boolean field in the scsi_disk structure. This flag is set to true when the disk is suspended is sd_suspend_common() and resumed with sd_resume(). When suspended is true, sd_shutdown() is not executed from sd_remove().
Cc: stable@vger.kernel.org Signed-off-by: Damien Le Moal dlemoal@kernel.org Reviewed-by: Hannes Reinecke hare@suse.de Reviewed-by: Bart Van Assche bvanassche@acm.org Reviewed-by: Martin K. Petersen martin.petersen@oracle.com
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 5a1b802d180f..83b6a3f3863b 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -3741,7 +3741,8 @@ static int sd_remove(struct device *dev) device_del(&sdkp->disk_dev); del_gendisk(sdkp->disk);
- sd_shutdown(dev);
- if (!sdkp->suspended)
sd_shutdown(dev);put_disk(sdkp->disk); return 0; @@ -3872,6 +3873,9 @@ static int sd_suspend_common(struct device *dev, bool runtime) ret = 0; }
- if (!ret)
sdkp->suspended = true;- return ret;
} @@ -3891,21 +3895,26 @@ static int sd_suspend_runtime(struct device *dev) static int sd_resume(struct device *dev, bool runtime) { struct scsi_disk *sdkp = dev_get_drvdata(dev);
- int ret;
- int ret = 0;
if (!sdkp) /* E.g.: runtime resume at the start of sd_probe() */ return 0;
- if (!sd_do_start_stop(sdkp->device, runtime))
- if (!sd_do_start_stop(sdkp->device, runtime)) {
sdkp->suspended = false;- }
if (!sdkp->device->no_start_on_resume) { sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); ret = sd_start_stop_device(sdkp, 1); }
- if (!ret)
- if (!ret) { opal_unlock_from_suspend(sdkp->opal_dev);
sdkp->suspended = false;- }
- return ret;
} diff --git a/drivers/scsi/sd.h b/drivers/scsi/sd.h index 5eea762f84d1..409dda5350d1 100644 --- a/drivers/scsi/sd.h +++ b/drivers/scsi/sd.h @@ -131,6 +131,7 @@ struct scsi_disk { u8 provisioning_mode; u8 zeroing_mode; u8 nr_actuators; /* Number of actuators */
- bool suspended; /* Disk is suspended (stopped) */ unsigned ATO : 1; /* state of disk ATO bit */ unsigned cache_override : 1; /* temp override of WCE,RCD */ unsigned WCE : 1; /* state of disk WCE bit */