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

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Hello,

Not sure if I should use EXPORT_SYMBOL or EXPORT_SYMBOL_GPL, any
comments?

Thanks,
Aaron

On 07/27/2012 05:00 PM, Aaron Lu wrote:
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@xxxxxxx>
---
  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;



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