linux-kernel - [PATCH v2 1/7] scsi: sr: fix for sr suspend and resume

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Date:	Tue, 24 Jul 2012 17:37:39 +0800
From:	Aaron Lu <aaron.lu@....com>
To:	Jeff Garzik <jgarzik@...ox.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Lin Ming <minggr@...il.com>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Jeff Wu <jeff.wu@....com>
CC:	<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 v2 1/7] scsi: sr: fix for sr suspend and resume

In sr_suspend, we do not need to do anything if it is not a runtime pm
request, so just return by checking the PM_IS_AUTO macro.
And in sr_resume, only reset the suspend_count back to 1 if the ODD is
waken up by the user, or the usage count of the scsi device will not
balance.

Signed-off-by: Aaron Lu <aaron.lu@....com>
---
V2:
Use PMSG_IS_AUTO as suggested by Alan Stern.

 drivers/scsi/sr.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index 3da0879..225848c 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -178,8 +178,8 @@ static int sr_suspend(struct device *dev, pm_message_t msg)
 	struct scsi_sense_hdr sshdr;
 	struct scsi_cd *cd = dev_get_drvdata(dev);
 
-	/* no action for system suspend */
-	if (msg.event == PM_EVENT_SUSPEND)
+	/* no action for system pm operations */
+	if (!PMSG_IS_AUTO(msg))
 		return 0;
 
 	/* do another TUR to see if the ODD is still ready to be powered off */
@@ -217,9 +217,9 @@ static int sr_resume(struct device *dev)
 		cd->device->wakeup_by_user = 0;
 		if (!(cd->cdi.mask & CDC_CLOSE_TRAY))
 			sr_tray_move(&cd->cdi, 1);
-	}
 
-	atomic_set(&cd->suspend_count, 1);
+		atomic_set(&cd->suspend_count, 1);
+	}
 
 	return 0;
 }
-- 
1.7.11.3


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