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Message-Id: <1341547472-6863-5-git-send-email-ming.m.lin@intel.com>
Date: Fri, 6 Jul 2012 12:04:32 +0800
From: Lin Ming <ming.m.lin@...el.com>
To: Jens Axboe <axboe@...nel.dk>,
Alan Stern <stern@...land.harvard.edu>,
"Rafael J. Wysocki" <rjw@...k.pl>, Shaohua Li <shli@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
linux-scsi@...r.kernel.org
Subject: [PATCH v5 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 path.
Signed-off-by: Lin Ming <ming.m.lin@...el.com>
---
drivers/scsi/scsi_pm.c | 38 ++++++++++++++++++++++++++++++--------
drivers/scsi/scsi_sysfs.c | 2 ++
drivers/scsi/sd.c | 7 -------
3 files changed, 32 insertions(+), 15 deletions(-)
diff --git a/drivers/scsi/scsi_pm.c b/drivers/scsi/scsi_pm.c
index dc0ad85..f0b279a 100644
--- a/drivers/scsi/scsi_pm.c
+++ b/drivers/scsi/scsi_pm.c
@@ -74,6 +74,7 @@ static int scsi_bus_suspend_common(struct device *dev, pm_message_t msg)
static int scsi_bus_resume_common(struct device *dev)
{
+ struct request_queue *q = NULL;
int err = 0;
/*
@@ -84,14 +85,22 @@ static int scsi_bus_resume_common(struct device *dev)
*/
pm_runtime_get_sync(dev->parent);
- if (scsi_is_sdev_device(dev))
+ if (scsi_is_sdev_device(dev)) {
+ struct scsi_device *sdev = to_scsi_device(dev);
+ q = sdev->request_queue;
+
+ blk_pre_runtime_resume(q);
err = scsi_dev_type_resume(dev);
+ }
if (err == 0) {
pm_runtime_disable(dev);
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
}
+ if (q)
+ blk_post_runtime_resume(q, err);
+
pm_runtime_put_sync(dev->parent);
return err;
@@ -143,10 +152,16 @@ 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 */
@@ -159,8 +174,14 @@ 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 */
@@ -175,9 +196,10 @@ 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_runtime_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 ce03a0a..db45bda 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -967,10 +967,6 @@ 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.
@@ -1015,8 +1011,6 @@ 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;
}
@@ -1051,7 +1045,6 @@ 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;
}
--
1.7.10
--
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