[PATCH v4 4/7] scsi: sr: block events when runtime suspended

[Aaron Lu <aaron.lu@amd.com>]

When the ODD is runtime suspended, there is no need to poll it for
events, so block events poll for it and unblock when resumed.

Signed-off-by: Aaron Lu <aaron.lu@amd.com>
---
 block/genhd.c     | 2 ++
 drivers/scsi/sr.c | 7 ++++---
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/block/genhd.c b/block/genhd.c
index 9cf5583..bdb3682 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1458,6 +1458,7 @@ void disk_block_events(struct gendisk *disk)
 
 	mutex_unlock(&ev->block_mutex);
 }
+EXPORT_SYMBOL(disk_block_events);
 
 static void __disk_unblock_events(struct gendisk *disk, bool check_now)
 {
@@ -1502,6 +1503,7 @@ void disk_unblock_events(struct gendisk *disk)
 	if (disk->ev)
 		__disk_unblock_events(disk, false);
 }
+EXPORT_SYMBOL(disk_unblock_events);
 
 /**
  * disk_flush_events - schedule immediate event checking and flushing
diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index acfd10a..cbc14ea 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -205,6 +205,8 @@ static int sr_suspend(struct device *dev, pm_message_t msg)
 		return -EBUSY;
 	}
 
+	disk_block_events(cd->disk);
+
 	return 0;
 }
 
@@ -226,6 +228,8 @@ static int sr_resume(struct device *dev)
 		atomic_set(&cd->suspend_count, 1);
 	}
 
+	disk_unblock_events(cd->disk);
+
 	return 0;
 }
 
@@ -314,9 +318,6 @@ static unsigned int sr_check_events(struct cdrom_device_info *cdi,
 	if (CDSL_CURRENT != slot)
 		return 0;
 
-	if (pm_runtime_suspended(&cd->device->sdev_gendev))
-		return 0;
-
 	/* if the logical unit just finished loading/unloading, do a TUR */
 	if (cd->device->can_power_off && cd->dbml && sr_unit_load_done(cd)) {
 		events = 0;
-- 
1.7.11.3