scsi: sd: Fix TCG OPAL unlock on system resume

Commit 3cc2ffe5c1 ("scsi: sd: Differentiate system and runtime start/stop
management") introduced the manage_system_start_stop scsi_device flag to
allow libata to indicate to the SCSI disk driver that nothing should be
done when resuming a disk on system resume. This change turned the
execution of sd_resume() into a no-op for ATA devices on system
resume. While this solved deadlock issues during device resume, this change
also wrongly removed the execution of opal_unlock_from_suspend().  As a
result, devices with TCG OPAL locking enabled remain locked and
inaccessible after a system resume from sleep.

To fix this issue, introduce the SCSI driver resume method and implement it
with the sd_resume() function calling opal_unlock_from_suspend(). The
former sd_resume() function is renamed to sd_resume_common() and modified
to call the new sd_resume() function. For non-ATA devices, this result in
no functional changes.

In order for libata to explicitly execute sd_resume() when a device is
resumed during system restart, the function scsi_resume_device() is
introduced. libata calls this function from the revalidation work executed
on devie resume, a state that is indicated with the new device flag
ATA_DFLAG_RESUMING. Doing so, locked TCG OPAL enabled devices are unlocked
on resume, allowing normal operation.

Fixes: 3cc2ffe5c1 ("scsi: sd: Differentiate system and runtime start/stop management")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=218538
Cc: stable@vger.kernel.org
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Link: https://lore.kernel.org/r/20240319071209.1179257-1-dlemoal@kernel.org
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Damien Le Moal 2024-03-19 16:12:09 +09:00 committed by Martin K. Petersen
parent 27f58c04a8
commit 0c76106cb9
7 changed files with 69 additions and 5 deletions

View File

@ -712,10 +712,12 @@ void ata_scsi_port_error_handler(struct Scsi_Host *host, struct ata_port *ap)
ehc->saved_ncq_enabled |= 1 << devno;
/* If we are resuming, wake up the device */
if (ap->pflags & ATA_PFLAG_RESUMING)
if (ap->pflags & ATA_PFLAG_RESUMING) {
dev->flags |= ATA_DFLAG_RESUMING;
ehc->i.dev_action[devno] |= ATA_EH_SET_ACTIVE;
}
}
}
ap->pflags |= ATA_PFLAG_EH_IN_PROGRESS;
ap->pflags &= ~ATA_PFLAG_EH_PENDING;
@ -3169,6 +3171,7 @@ static int ata_eh_revalidate_and_attach(struct ata_link *link,
return 0;
err:
dev->flags &= ~ATA_DFLAG_RESUMING;
*r_failed_dev = dev;
return rc;
}

View File

@ -4730,6 +4730,7 @@ void ata_scsi_dev_rescan(struct work_struct *work)
struct ata_link *link;
struct ata_device *dev;
unsigned long flags;
bool do_resume;
int ret = 0;
mutex_lock(&ap->scsi_scan_mutex);
@ -4751,7 +4752,15 @@ void ata_scsi_dev_rescan(struct work_struct *work)
if (scsi_device_get(sdev))
continue;
do_resume = dev->flags & ATA_DFLAG_RESUMING;
spin_unlock_irqrestore(ap->lock, flags);
if (do_resume) {
ret = scsi_resume_device(sdev);
if (ret == -EWOULDBLOCK)
goto unlock;
dev->flags &= ~ATA_DFLAG_RESUMING;
}
ret = scsi_rescan_device(sdev);
scsi_device_put(sdev);
spin_lock_irqsave(ap->lock, flags);

View File

@ -1642,6 +1642,40 @@ int scsi_add_device(struct Scsi_Host *host, uint channel,
}
EXPORT_SYMBOL(scsi_add_device);
int scsi_resume_device(struct scsi_device *sdev)
{
struct device *dev = &sdev->sdev_gendev;
int ret = 0;
device_lock(dev);
/*
* Bail out if the device or its queue are not running. Otherwise,
* the rescan may block waiting for commands to be executed, with us
* holding the device lock. This can result in a potential deadlock
* in the power management core code when system resume is on-going.
*/
if (sdev->sdev_state != SDEV_RUNNING ||
blk_queue_pm_only(sdev->request_queue)) {
ret = -EWOULDBLOCK;
goto unlock;
}
if (dev->driver && try_module_get(dev->driver->owner)) {
struct scsi_driver *drv = to_scsi_driver(dev->driver);
if (drv->resume)
ret = drv->resume(dev);
module_put(dev->driver->owner);
}
unlock:
device_unlock(dev);
return ret;
}
EXPORT_SYMBOL(scsi_resume_device);
int scsi_rescan_device(struct scsi_device *sdev)
{
struct device *dev = &sdev->sdev_gendev;

View File

@ -4108,7 +4108,21 @@ static int sd_suspend_runtime(struct device *dev)
return sd_suspend_common(dev, true);
}
static int sd_resume(struct device *dev, bool runtime)
static int sd_resume(struct device *dev)
{
struct scsi_disk *sdkp = dev_get_drvdata(dev);
sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
if (opal_unlock_from_suspend(sdkp->opal_dev)) {
sd_printk(KERN_NOTICE, sdkp, "OPAL unlock failed\n");
return -EIO;
}
return 0;
}
static int sd_resume_common(struct device *dev, bool runtime)
{
struct scsi_disk *sdkp = dev_get_drvdata(dev);
int ret;
@ -4124,7 +4138,7 @@ static int sd_resume(struct device *dev, bool runtime)
sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
ret = sd_start_stop_device(sdkp, 1);
if (!ret) {
opal_unlock_from_suspend(sdkp->opal_dev);
sd_resume(dev);
sdkp->suspended = false;
}
@ -4143,7 +4157,7 @@ static int sd_resume_system(struct device *dev)
return 0;
}
return sd_resume(dev, false);
return sd_resume_common(dev, false);
}
static int sd_resume_runtime(struct device *dev)
@ -4170,7 +4184,7 @@ static int sd_resume_runtime(struct device *dev)
"Failed to clear sense data\n");
}
return sd_resume(dev, true);
return sd_resume_common(dev, true);
}
static const struct dev_pm_ops sd_pm_ops = {
@ -4193,6 +4207,7 @@ static struct scsi_driver sd_template = {
.pm = &sd_pm_ops,
},
.rescan = sd_rescan,
.resume = sd_resume,
.init_command = sd_init_command,
.uninit_command = sd_uninit_command,
.done = sd_done,

View File

@ -107,6 +107,7 @@ enum {
ATA_DFLAG_NCQ_PRIO_ENABLED = (1 << 20), /* Priority cmds sent to dev */
ATA_DFLAG_CDL_ENABLED = (1 << 21), /* cmd duration limits is enabled */
ATA_DFLAG_RESUMING = (1 << 22), /* Device is resuming */
ATA_DFLAG_DETACH = (1 << 24),
ATA_DFLAG_DETACHED = (1 << 25),
ATA_DFLAG_DA = (1 << 26), /* device supports Device Attention */

View File

@ -12,6 +12,7 @@ struct request;
struct scsi_driver {
struct device_driver gendrv;
int (*resume)(struct device *);
void (*rescan)(struct device *);
blk_status_t (*init_command)(struct scsi_cmnd *);
void (*uninit_command)(struct scsi_cmnd *);

View File

@ -767,6 +767,7 @@ scsi_template_proc_dir(const struct scsi_host_template *sht);
#define scsi_template_proc_dir(sht) NULL
#endif
extern void scsi_scan_host(struct Scsi_Host *);
extern int scsi_resume_device(struct scsi_device *sdev);
extern int scsi_rescan_device(struct scsi_device *sdev);
extern void scsi_remove_host(struct Scsi_Host *);
extern struct Scsi_Host *scsi_host_get(struct Scsi_Host *);