diff options
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/scsi_pm.c | 86 |
1 files changed, 53 insertions, 33 deletions
diff --git a/drivers/scsi/scsi_pm.c b/drivers/scsi/scsi_pm.c index 9923b262263d..8f6b12cbd224 100644 --- a/drivers/scsi/scsi_pm.c +++ b/drivers/scsi/scsi_pm.c @@ -16,16 +16,14 @@ #include "scsi_priv.h" -static int scsi_dev_type_suspend(struct device *dev, pm_message_t msg) +static int scsi_dev_type_suspend(struct device *dev, int (*cb)(struct device *)) { - struct device_driver *drv; int err; err = scsi_device_quiesce(to_scsi_device(dev)); if (err == 0) { - drv = dev->driver; - if (drv && drv->suspend) { - err = drv->suspend(dev, msg); + if (cb) { + err = cb(dev); if (err) scsi_device_resume(to_scsi_device(dev)); } @@ -34,14 +32,12 @@ static int scsi_dev_type_suspend(struct device *dev, pm_message_t msg) return err; } -static int scsi_dev_type_resume(struct device *dev) +static int scsi_dev_type_resume(struct device *dev, int (*cb)(struct device *)) { - struct device_driver *drv; int err = 0; - drv = dev->driver; - if (drv && drv->resume) - err = drv->resume(dev); + if (cb) + err = cb(dev); scsi_device_resume(to_scsi_device(dev)); dev_dbg(dev, "scsi resume: %d\n", err); return err; @@ -49,35 +45,33 @@ static int scsi_dev_type_resume(struct device *dev) #ifdef CONFIG_PM_SLEEP -static int scsi_bus_suspend_common(struct device *dev, pm_message_t msg) +static int +scsi_bus_suspend_common(struct device *dev, int (*cb)(struct device *)) { int err = 0; if (scsi_is_sdev_device(dev)) { /* - * sd is the only high-level SCSI driver to implement runtime - * PM, and sd treats runtime suspend, system suspend, and - * system hibernate identically (but not system freeze). + * All the high-level SCSI drivers that implement runtime + * PM treat runtime suspend, system suspend, and system + * hibernate identically. */ - if (pm_runtime_suspended(dev)) { - if (msg.event == PM_EVENT_SUSPEND || - msg.event == PM_EVENT_HIBERNATE) - return 0; /* already suspended */ + if (pm_runtime_suspended(dev)) + return 0; - /* wake up device so that FREEZE will succeed */ - pm_runtime_resume(dev); - } - err = scsi_dev_type_suspend(dev, msg); + err = scsi_dev_type_suspend(dev, cb); } + return err; } -static int scsi_bus_resume_common(struct device *dev) +static int +scsi_bus_resume_common(struct device *dev, int (*cb)(struct device *)) { int err = 0; if (scsi_is_sdev_device(dev)) - err = scsi_dev_type_resume(dev); + err = scsi_dev_type_resume(dev, cb); if (err == 0) { pm_runtime_disable(dev); @@ -102,26 +96,49 @@ static int scsi_bus_prepare(struct device *dev) static int scsi_bus_suspend(struct device *dev) { - return scsi_bus_suspend_common(dev, PMSG_SUSPEND); + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + return scsi_bus_suspend_common(dev, pm ? pm->suspend : NULL); +} + +static int scsi_bus_resume(struct device *dev) +{ + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + return scsi_bus_resume_common(dev, pm ? pm->resume : NULL); } static int scsi_bus_freeze(struct device *dev) { - return scsi_bus_suspend_common(dev, PMSG_FREEZE); + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + return scsi_bus_suspend_common(dev, pm ? pm->freeze : NULL); +} + +static int scsi_bus_thaw(struct device *dev) +{ + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + return scsi_bus_resume_common(dev, pm ? pm->thaw : NULL); } static int scsi_bus_poweroff(struct device *dev) { - return scsi_bus_suspend_common(dev, PMSG_HIBERNATE); + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + return scsi_bus_suspend_common(dev, pm ? pm->poweroff : NULL); +} + +static int scsi_bus_restore(struct device *dev) +{ + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + return scsi_bus_resume_common(dev, pm ? pm->restore : NULL); } #else /* CONFIG_PM_SLEEP */ -#define scsi_bus_resume_common NULL #define scsi_bus_prepare NULL #define scsi_bus_suspend NULL +#define scsi_bus_resume NULL #define scsi_bus_freeze NULL +#define scsi_bus_thaw NULL #define scsi_bus_poweroff NULL +#define scsi_bus_restore NULL #endif /* CONFIG_PM_SLEEP */ @@ -130,10 +147,12 @@ static int scsi_bus_poweroff(struct device *dev) 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, PMSG_AUTO_SUSPEND); + 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))); @@ -147,10 +166,11 @@ static int scsi_runtime_suspend(struct device *dev) 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); + err = scsi_dev_type_resume(dev, pm ? pm->runtime_resume : NULL); /* Insert hooks here for targets, hosts, and transport classes */ @@ -229,11 +249,11 @@ void scsi_autopm_put_host(struct Scsi_Host *shost) const struct dev_pm_ops scsi_bus_pm_ops = { .prepare = scsi_bus_prepare, .suspend = scsi_bus_suspend, - .resume = scsi_bus_resume_common, + .resume = scsi_bus_resume, .freeze = scsi_bus_freeze, - .thaw = scsi_bus_resume_common, + .thaw = scsi_bus_thaw, .poweroff = scsi_bus_poweroff, - .restore = scsi_bus_resume_common, + .restore = scsi_bus_restore, .runtime_suspend = scsi_runtime_suspend, .runtime_resume = scsi_runtime_resume, .runtime_idle = scsi_runtime_idle, |