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

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Message-ID: <1343379650-2867-5-git-send-email-aaron.lu@amd.com>
Date:	Fri, 27 Jul 2012 17:00:47 +0800
From:	Aaron Lu <aaron.lu@....com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>,
	Jeff Garzik <jgarzik@...ox.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Sergei Shtylyov <sshtylyov@...sta.com>,
	Oliver Neukum <oneukum@...e.de>
CC:	Jeff Wu <jeff.wu@....com>, Lin Ming <minggr@...il.com>,
	<linux-kernel@...r.kernel.org>, <linux-pm@...r.kernel.org>,
	<linux-scsi@...r.kernel.org>, <linux-ide@...r.kernel.org>,
	Aaron Lu <aaron.lwe@...il.com>, Aaron Lu <aaron.lu@....com>
Subject: [PATCH v4 4/7] scsi: sr: block events when runtime suspended

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@....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


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