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[SCSI] sd: change to auto suspend mode 

Uses block layer runtime pm helper functions in
scsi_runtime_suspend/resume for devices that take advantage of it.

Remove scsi_autopm_* from sd open/release path and check_events path.

Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Lin Ming 2013-03-23 11:42:28 +08:00 committed by James Bottomley
parent 9b21493c45
commit 6df339a51e
2 changed files with 72 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

84
drivers/scsi/scsi_pm.c
View File

@ -144,33 +144,83 @@ static int scsi_bus_restore(struct device *dev)
#ifdef CONFIG_PM_RUNTIME
static int sdev_blk_runtime_suspend(struct scsi_device *sdev,
int (*cb)(struct device *))
{
int err;
err = blk_pre_runtime_suspend(sdev->request_queue);
if (err)
return err;
if (cb)
err = cb(&sdev->sdev_gendev);
blk_post_runtime_suspend(sdev->request_queue, err);
return err;
}
static int sdev_runtime_suspend(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
int (*cb)(struct device *) = pm ? pm->runtime_suspend : NULL;
struct scsi_device *sdev = to_scsi_device(dev);
int err;
if (sdev->request_queue->dev)
return sdev_blk_runtime_suspend(sdev, cb);
err = scsi_dev_type_suspend(dev, cb);
if (err == -EAGAIN)
pm_schedule_suspend(dev, jiffies_to_msecs(
round_jiffies_up_relative(HZ/10)));
return err;
}
static int scsi_runtime_suspend(struct device *dev)
{
int err = 0;
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
dev_dbg(dev, "scsi_runtime_suspend\n");
if (scsi_is_sdev_device(dev)) {
err = scsi_dev_type_suspend(dev,
pm ? pm->runtime_suspend : NULL);
if (err == -EAGAIN)
pm_schedule_suspend(dev, jiffies_to_msecs(
round_jiffies_up_relative(HZ/10)));
}
if (scsi_is_sdev_device(dev))
err = sdev_runtime_suspend(dev);
/* Insert hooks here for targets, hosts, and transport classes */
return err;
}
static int sdev_blk_runtime_resume(struct scsi_device *sdev,
int (*cb)(struct device *))
{
int err = 0;
blk_pre_runtime_resume(sdev->request_queue);
if (cb)
err = cb(&sdev->sdev_gendev);
blk_post_runtime_resume(sdev->request_queue, err);
return err;
}
static int sdev_runtime_resume(struct device *dev)
{
struct scsi_device *sdev = to_scsi_device(dev);
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
int (*cb)(struct device *) = pm ? pm->runtime_resume : NULL;
if (sdev->request_queue->dev)
return sdev_blk_runtime_resume(sdev, cb);
else
return scsi_dev_type_resume(dev, cb);
}
static int scsi_runtime_resume(struct device *dev)
{
int err = 0;
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
dev_dbg(dev, "scsi_runtime_resume\n");
if (scsi_is_sdev_device(dev))
err = scsi_dev_type_resume(dev, pm ? pm->runtime_resume : NULL);
err = sdev_runtime_resume(dev);
/* Insert hooks here for targets, hosts, and transport classes */
@ -185,10 +235,18 @@ 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)) {
struct scsi_device *sdev = to_scsi_device(dev);
if (sdev->request_queue->dev) {
pm_runtime_mark_last_busy(dev);
err = pm_runtime_autosuspend(dev);
} else {
err = pm_runtime_suspend(dev);
}
} else {
err = pm_runtime_suspend(dev);
}
return err;
}

13
drivers/scsi/sd.c
View File

@ -1121,10 +1121,6 @@ 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.
@ -1169,8 +1165,6 @@ 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;
}
@ -1205,7 +1199,6 @@ 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;
}
@ -1367,14 +1360,9 @@ static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
retval = -ENODEV;
if (scsi_block_when_processing_errors(sdp)) {
retval = scsi_autopm_get_device(sdp);
if (retval)
goto out;
sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
sshdr);
scsi_autopm_put_device(sdp);
}
/* failed to execute TUR, assume media not present */
@ -2839,6 +2827,7 @@ static void sd_probe_async(void *data, async_cookie_t cookie)
sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
sdp->removable ? "removable " : "");
blk_pm_runtime_init(sdp->request_queue, dev);
scsi_autopm_put_device(sdp);
put_device(&sdkp->dev);
}