[PATCH 3/5] scsi: sr: block events when runtime suspended

Aaron Lu
2012-07-23T07:06:07Z

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 f7a7635..69c9e22 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -208,6 +208,8 @@ static int sr_suspend(struct device *dev, pm_message_t msg)
return -EBUSY;
}

+ disk_block_events(cd->disk);
+
return 0;
}

@@ -230,6 +232,8 @@ static int sr_resume(struct device *dev)
atomic_set(&cd->suspend_count, 1);
}

+ disk_unblock_events(cd->disk);
+
return 0;
}

@@ -318,9 +322,6 @@ 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