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scsi: smartpqi: Update device scan operations

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Change return type from EINPROGRESS to EBUSY to signal applications to
retry a REGNEWD if the driver cannot process the REGNEWD. Events such as
OFA, suspend, and shutdown return EINPROGRESS if a scan is currently
running. This prevents applications from immediately retrying REGNEWD.

Schedule a new REGNEWD if system low on memory.

Link: https://lore.kernel.org/r/161549382157.25025.16054784597622125373.stgit@brunhilda
Reviewed-by: Scott Benesh <scott.benesh@microchip.com>
Reviewed-by: Mike McGowen <mike.mcgowen@microchip.com>
Reviewed-by: Scott Teel <scott.teel@microchip.com>
Signed-off-by: Kevin Barnett <kevin.barnett@microchip.com>
Signed-off-by: Don Brace <don.brace@microchip.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Kevin Barnett 2021-03-11 14:17:01 -06:00 committed by Martin K. Petersen
parent 2790cd4d3f
commit 66f1c2b402
1 changed files with 14 additions and 8 deletions
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22
drivers/scsi/smartpqi/smartpqi_init.c
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@ -2312,21 +2312,27 @@ out:
static int pqi_scan_scsi_devices(struct pqi_ctrl_info *ctrl_info)
{
int rc = 0;
int rc;
int mutex_acquired;
if (pqi_ctrl_offline(ctrl_info))
return -ENXIO;
if (!mutex_trylock(&ctrl_info->scan_mutex)) {
mutex_acquired = mutex_trylock(&ctrl_info->scan_mutex);
if (!mutex_acquired) {
if (pqi_ctrl_scan_blocked(ctrl_info))
return -EBUSY;
pqi_schedule_rescan_worker_delayed(ctrl_info);
rc = -EINPROGRESS;
} else {
rc = pqi_update_scsi_devices(ctrl_info);
if (rc)
pqi_schedule_rescan_worker_delayed(ctrl_info);
mutex_unlock(&ctrl_info->scan_mutex);
return -EINPROGRESS;
}
rc = pqi_update_scsi_devices(ctrl_info);
if (rc && !pqi_ctrl_scan_blocked(ctrl_info))
pqi_schedule_rescan_worker_delayed(ctrl_info);
mutex_unlock(&ctrl_info->scan_mutex);
return rc;
}