linux-kernel - [RFC PATCH v3 4/4] [SCSI] sd: change to auto suspend mode

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Date:	Tue, 22 May 2012 15:21:32 +0800
From:	Lin Ming <ming.m.lin@...el.com>
To:	Jens Axboe <axboe@...nel.dk>,
	Alan Stern <stern@...land.harvard.edu>
Cc:	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-scsi@...r.kernel.org
Subject: [RFC PATCH v3 4/4] [SCSI] sd: change to auto suspend mode

Uses block layer runtime pm helper functions in scsi_runtime_suspend/resume.
Remove scsi_autopm_* from sd open/release/remove path.

Signed-off-by: Lin Ming <ming.m.lin@...el.com>
---
 drivers/scsi/scsi_pm.c    |   27 ++++++++++++++++++++-------
 drivers/scsi/scsi_sysfs.c |    2 ++
 drivers/scsi/sd.c         |   10 +---------
 3 files changed, 23 insertions(+), 16 deletions(-)

diff --git a/drivers/scsi/scsi_pm.c b/drivers/scsi/scsi_pm.c
index c467064..302a157 100644
--- a/drivers/scsi/scsi_pm.c
+++ b/drivers/scsi/scsi_pm.c
@@ -139,10 +139,16 @@ static int scsi_runtime_suspend(struct device *dev)
 
 	dev_dbg(dev, "scsi_runtime_suspend\n");
 	if (scsi_is_sdev_device(dev)) {
+		struct scsi_device *sdev = to_scsi_device(dev);
+		struct request_queue *q = sdev->request_queue;
+
+		err = blk_pre_runtime_suspend(q);
+		if (err)
+			return err;
+
 		err = scsi_dev_type_suspend(dev, PMSG_AUTO_SUSPEND);
-		if (err == -EAGAIN)
-			pm_schedule_suspend(dev, jiffies_to_msecs(
-				round_jiffies_up_relative(HZ/10)));
+
+		blk_post_runtime_suspend(q, err);
 	}
 
 	/* Insert hooks here for targets, hosts, and transport classes */
@@ -155,8 +161,14 @@ static int scsi_runtime_resume(struct device *dev)
 	int err = 0;
 
 	dev_dbg(dev, "scsi_runtime_resume\n");
-	if (scsi_is_sdev_device(dev))
+	if (scsi_is_sdev_device(dev)) {
+		struct scsi_device *sdev = to_scsi_device(dev);
+		struct request_queue *q = sdev->request_queue;
+
+		blk_pre_runtime_resume(q);
 		err = scsi_dev_type_resume(dev);
+		blk_post_runtime_resume(q, err);
+	}
 
 	/* Insert hooks here for targets, hosts, and transport classes */
 
@@ -171,9 +183,10 @@ static int scsi_runtime_idle(struct device *dev)
 
 	/* Insert hooks here for targets, hosts, and transport classes */
 
-	if (scsi_is_sdev_device(dev))
-		err = pm_schedule_suspend(dev, 100);
-	else
+	if (scsi_is_sdev_device(dev)) {
+		pm_runtime_mark_last_busy(dev);
+		err = pm_request_autosuspend(dev);
+	} else
 		err = pm_runtime_suspend(dev);
 	return err;
 }
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 04c2a27..1e8975f 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -895,6 +895,8 @@ int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 	 */
 	scsi_autopm_get_device(sdev);
 
+	blk_pm_runtime_init(rq, &sdev->sdev_gendev);
+
 	error = device_add(&sdev->sdev_gendev);
 	if (error) {
 		sdev_printk(KERN_INFO, sdev,
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 1205a8b..09e5ffe 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -966,10 +966,6 @@ static int sd_open(struct block_device *bdev, fmode_t mode)
 
 	sdev = sdkp->device;
 
-	retval = scsi_autopm_get_device(sdev);
-	if (retval)
-		goto error_autopm;
-
 	/*
 	 * If the device is in error recovery, wait until it is done.
 	 * If the device is offline, then disallow any access to it.
@@ -1014,8 +1010,6 @@ static int sd_open(struct block_device *bdev, fmode_t mode)
 	return 0;
 
 error_out:
-	scsi_autopm_put_device(sdev);
-error_autopm:
 	scsi_disk_put(sdkp);
 	return retval;	
 }
@@ -1050,7 +1044,6 @@ static int sd_release(struct gendisk *disk, fmode_t mode)
 	 * XXX is followed by a "rmmod sd_mod"?
 	 */
 
-	scsi_autopm_put_device(sdev);
 	scsi_disk_put(sdkp);
 	return 0;
 }
@@ -2631,7 +2624,7 @@ static void sd_probe_async(void *data, async_cookie_t cookie)
 
 	sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
 		  sdp->removable ? "removable " : "");
-	scsi_autopm_put_device(sdp);
+	pm_runtime_put_sync_autosuspend(&sdp->sdev_gendev);
 	put_device(&sdkp->dev);
 }
 
@@ -2755,7 +2748,6 @@ static int sd_remove(struct device *dev)
 	struct scsi_disk *sdkp;
 
 	sdkp = dev_get_drvdata(dev);
-	scsi_autopm_get_device(sdkp->device);
 
 	async_synchronize_full();
 	blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
-- 
1.7.2.5

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