2 files changed, 17 insertions, 0 deletions

diff --git a/drivers/scsi/scsi_pm.c b/drivers/scsi/scsi_pm.c
index bf8bf79e6a1f..c4670642d023 100644
--- a/drivers/scsi/scsi_pm.c
+++ b/drivers/scsi/scsi_pm.c
@@ -7,6 +7,7 @@
 
 #include <linux/pm_runtime.h>
 #include <linux/export.h>
+#include <linux/async.h>
 
 #include <scsi/scsi.h>
 #include <scsi/scsi_device.h>
@@ -92,6 +93,19 @@ static int scsi_bus_resume_common(struct device *dev)
         return err;
 }
 
+static int scsi_bus_prepare(struct device *dev)
+{
+        if (scsi_is_sdev_device(dev)) {
+                /* sd probing uses async_schedule.  Wait until it finishes. */
+                async_synchronize_full();
+
+        } else if (scsi_is_host_device(dev)) {
+                /* Wait until async scanning is finished */
+                scsi_complete_async_scans();
+        }
+        return 0;
+}
+
 static int scsi_bus_suspend(struct device *dev)
 {
         return scsi_bus_suspend_common(dev, PMSG_SUSPEND);
@@ -110,6 +124,7 @@ static int scsi_bus_poweroff(struct device *dev)
 #else /* CONFIG_PM_SLEEP */
 
 #define scsi_bus_resume_common          NULL
+#define scsi_bus_prepare                NULL
 #define scsi_bus_suspend                NULL
 #define scsi_bus_freeze                 NULL
 #define scsi_bus_poweroff               NULL
@@ -218,6 +233,7 @@ void scsi_autopm_put_host(struct Scsi_Host *shost)
 #endif /* CONFIG_PM_RUNTIME */
 
 const struct dev_pm_ops scsi_bus_pm_ops = {
+        .prepare =              scsi_bus_prepare,
         .suspend =              scsi_bus_suspend,
         .resume =               scsi_bus_resume_common,
         .freeze =               scsi_bus_freeze,
diff --git a/drivers/scsi/scsi_priv.h b/drivers/scsi/scsi_priv.h
index 68eadd1c67fd..be4fa6d179b1 100644
--- a/drivers/scsi/scsi_priv.h
+++ b/drivers/scsi/scsi_priv.h
@@ -109,6 +109,7 @@ extern void scsi_exit_procfs(void);
 #endif /* CONFIG_PROC_FS */
 
 /* scsi_scan.c */
+extern int scsi_complete_async_scans(void);
 extern int scsi_scan_host_selected(struct Scsi_Host *, unsigned int,
                                    unsigned int, unsigned int, int);
 extern void scsi_forget_host(struct Scsi_Host *);