scsi: core: pm: Rely on the device driver core for async power management

Instead of implementing asynchronous resume support in the SCSI core, rely
on the device driver core for resuming SCSI devices asynchronously.
Instead of only supporting asynchronous resumes, also support asynchronous
suspends.

Link: https://lore.kernel.org/r/20211006215453.3318929-2-bvanassche@acm.org
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Martin Kepplinger <martin.kepplinger@puri.sm>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 2 insertions, 42 deletions

diff --git a/drivers/scsi/scsi_pm.c b/drivers/scsi/scsi_pm.c
index 3717eea37ecb..50b6bad4df79 100644
--- a/drivers/scsi/scsi_pm.c
+++ b/drivers/scsi/scsi_pm.c
@@ -56,9 +56,6 @@ static int scsi_dev_type_suspend(struct device *dev,
 	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 	int err;
 
-	/* flush pending in-flight resume operations, suspend is synchronous */
-	async_synchronize_full_domain(&scsi_sd_pm_domain);
-
 	err = scsi_device_quiesce(to_scsi_device(dev));
 	if (err == 0) {
 		err = cb(dev, pm);
@@ -123,48 +120,11 @@ scsi_bus_suspend_common(struct device *dev,
 	return err;
 }
 
-static void async_sdev_resume(void *dev, async_cookie_t cookie)
-{
-	scsi_dev_type_resume(dev, do_scsi_resume);
-}
-
-static void async_sdev_thaw(void *dev, async_cookie_t cookie)
-{
-	scsi_dev_type_resume(dev, do_scsi_thaw);
-}
-
-static void async_sdev_restore(void *dev, async_cookie_t cookie)
-{
-	scsi_dev_type_resume(dev, do_scsi_restore);
-}
-
 static int scsi_bus_resume_common(struct device *dev,
 		int (*cb)(struct device *, const struct dev_pm_ops *))
 {
-	async_func_t fn;
-
-	if (!scsi_is_sdev_device(dev))
-		fn = NULL;
-	else if (cb == do_scsi_resume)
-		fn = async_sdev_resume;
-	else if (cb == do_scsi_thaw)
-		fn = async_sdev_thaw;
-	else if (cb == do_scsi_restore)
-		fn = async_sdev_restore;
-	else
-		fn = NULL;
-
-	if (fn) {
-		async_schedule_domain(fn, dev, &scsi_sd_pm_domain);
-
-		/*
-		 * If a user has disabled async probing a likely reason
-		 * is due to a storage enclosure that does not inject
-		 * staggered spin-ups.  For safety, make resume
-		 * synchronous as well in that case.
-		 */
-		if (strncmp(scsi_scan_type, "async", 5) != 0)
-			async_synchronize_full_domain(&scsi_sd_pm_domain);
+	if (scsi_is_sdev_device(dev)) {
+		scsi_dev_type_resume(dev, cb);
 	} else {
 		pm_runtime_disable(dev);
 		pm_runtime_set_active(dev);