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[SCSI] sd: implement START/STOP management

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Implement SBC START/STOP management.  sdev->mange_start_stop is added.
When it's set to one, sd STOPs the device on suspend and shutdown and
STARTs it on resume.  sdev->manage_start_stop defaults is in sdev
instead of scsi_disk cdev to allow ->slave_config() override the
default configuration but is exported under scsi_disk sysfs node as
sdev->allow_restart is.

When manage_start_stop is zero (the default value), this patch doesn't
introduce any behavior change.

Signed-off-by: Tejun Heo <htejun@gmail.com>

Rejections fixed and
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Tejun Heo
2007-03-21 00:13:59 +09:00
committed by James Bottomley
parent 3721050afc
commit c3c94c5a2f
4 changed files with 132 additions and 5 deletions
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33
drivers/scsi/scsi_sysfs.c
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@@ -278,6 +278,7 @@ static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
static int scsi_bus_suspend(struct device * dev, pm_message_t state)
{
struct device_driver *drv = dev->driver;
struct scsi_device *sdev = to_scsi_device(dev);
struct scsi_host_template *sht = sdev->host->hostt;
int err;
@@ -286,23 +287,45 @@ static int scsi_bus_suspend(struct device * dev, pm_message_t state)
if (err)
return err;
if (sht->suspend)
err = sht->suspend(sdev, state);
/* call HLD suspend first */
if (drv && drv->suspend) {
err = drv->suspend(dev, state);
if (err)
return err;
}
return err;
/* then, call host suspend */
if (sht->suspend) {
err = sht->suspend(sdev, state);
if (err) {
if (drv && drv->resume)
drv->resume(dev);
return err;
}
}
return 0;
}
static int scsi_bus_resume(struct device * dev)
{
struct device_driver *drv = dev->driver;
struct scsi_device *sdev = to_scsi_device(dev);
struct scsi_host_template *sht = sdev->host->hostt;
int err = 0;
int err = 0, err2 = 0;
/* call host resume first */
if (sht->resume)
err = sht->resume(sdev);
/* then, call HLD resume */
if (drv && drv->resume)
err2 = drv->resume(dev);
scsi_device_resume(sdev);
return err;
/* favor LLD failure */
return err ? err : err2;;
}
struct bus_type scsi_bus_type = {