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| author | Tejun Heo <htejun@gmail.com> | 2007-03-20 18:13:59 +0300 |
|---|---|---|
| committer | James Bottomley <jejb@mulgrave.il.steeleye.com> | 2007-03-20 20:06:20 +0300 |
| commit | c3c94c5a2fb43a654e777f509d5032b0db8ed09f (patch) | |
| tree | cbc9b0adfa0a83fc5859344d6f9911d3010a29ac /drivers/scsi/scsi_sysfs.c | |
| parent | 3721050afc6cb6ddf6de0f782e2054ebcc225e9b (diff) | |
| download | linux-c3c94c5a2fb43a654e777f509d5032b0db8ed09f.tar.xz | |
[SCSI] sd: implement START/STOP management
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>
Diffstat (limited to 'drivers/scsi/scsi_sysfs.c')
| -rw-r--r-- | drivers/scsi/scsi_sysfs.c | 31 |
1 files changed, 27 insertions, 4 deletions
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c index c275dcac3f18..96db51c40ef3 100644 --- a/drivers/scsi/scsi_sysfs.c +++ b/drivers/scsi/scsi_sysfs.c @@ -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) + /* call HLD suspend first */ + if (drv && drv->suspend) { + err = drv->suspend(dev, state); + if (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 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 = { |