return 0;
}
-static int ata_standby_drive(struct ata_device *dev)
-{
- unsigned int err_mask;
-
- err_mask = ata_do_simple_cmd(dev, ATA_CMD_STANDBYNOW1);
- if (err_mask) {
- ata_dev_printk(dev, KERN_ERR, "failed to standby drive "
- "(err_mask=0x%x)\n", err_mask);
- return -EIO;
- }
-
- return 0;
-}
-
-static int ata_start_drive(struct ata_device *dev)
-{
- unsigned int err_mask;
-
- err_mask = ata_do_simple_cmd(dev, ATA_CMD_IDLEIMMEDIATE);
- if (err_mask) {
- ata_dev_printk(dev, KERN_ERR, "failed to start drive "
- "(err_mask=0x%x)\n", err_mask);
- return -EIO;
- }
-
- return 0;
-}
-
-/**
- * ata_device_resume - wakeup a previously suspended devices
- * @dev: the device to resume
- *
- * Kick the drive back into action, by sending it an idle immediate
- * command and making sure its transfer mode matches between drive
- * and host.
- *
- */
-int ata_device_resume(struct ata_device *dev)
-{
- struct ata_port *ap = dev->ap;
-
- if (ap->pflags & ATA_PFLAG_SUSPENDED) {
- struct ata_device *failed_dev;
-
- ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
- ata_busy_wait(ap, ATA_BUSY | ATA_DRQ, 200000);
-
- ap->pflags &= ~ATA_PFLAG_SUSPENDED;
- while (ata_set_mode(ap, &failed_dev))
- ata_dev_disable(failed_dev);
- }
- if (!ata_dev_enabled(dev))
- return 0;
- if (dev->class == ATA_DEV_ATA)
- ata_start_drive(dev);
-
- return 0;
-}
-
-/**
- * ata_device_suspend - prepare a device for suspend
- * @dev: the device to suspend
- * @state: target power management state
- *
- * Flush the cache on the drive, if appropriate, then issue a
- * standbynow command.
- */
-int ata_device_suspend(struct ata_device *dev, pm_message_t state)
-{
- struct ata_port *ap = dev->ap;
-
- if (!ata_dev_enabled(dev))
- return 0;
- if (dev->class == ATA_DEV_ATA)
- ata_flush_cache(dev);
-
- if (state.event != PM_EVENT_FREEZE)
- ata_standby_drive(dev);
- ap->pflags |= ATA_PFLAG_SUSPENDED;
- return 0;
-}
-
/**
* ata_port_start - Set port up for dma.
* @ap: Port to initialize
EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
#endif /* CONFIG_PCI */
-EXPORT_SYMBOL_GPL(ata_device_suspend);
-EXPORT_SYMBOL_GPL(ata_device_resume);
EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
EXPORT_SYMBOL_GPL(ata_scsi_device_resume);
}
}
-int ata_scsi_device_resume(struct scsi_device *sdev)
+/**
+ * ata_scsi_device_suspend - suspend ATA device associated with sdev
+ * @sdev: the SCSI device to suspend
+ * @state: target power management state
+ *
+ * Request suspend EH action on the ATA device associated with
+ * @sdev and wait for the operation to complete.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep).
+ *
+ * RETURNS:
+ * 0 on success, -errno otherwise.
+ */
+int ata_scsi_device_suspend(struct scsi_device *sdev, pm_message_t state)
{
struct ata_port *ap = ata_shost_to_port(sdev->host);
- struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
+ struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
+ unsigned long flags;
+ unsigned int action;
+ int rc = 0;
+
+ if (!dev)
+ goto out;
+
+ spin_lock_irqsave(ap->lock, flags);
+
+ /* wait for the previous resume to complete */
+ while (dev->flags & ATA_DFLAG_SUSPENDED) {
+ spin_unlock_irqrestore(ap->lock, flags);
+ ata_port_wait_eh(ap);
+ spin_lock_irqsave(ap->lock, flags);
+ }
+
+ /* if @sdev is already detached, nothing to do */
+ if (sdev->sdev_state == SDEV_OFFLINE ||
+ sdev->sdev_state == SDEV_CANCEL || sdev->sdev_state == SDEV_DEL)
+ goto out_unlock;
+
+ /* request suspend */
+ action = ATA_EH_SUSPEND;
+ if (state.event != PM_EVENT_SUSPEND)
+ action |= ATA_EH_PM_FREEZE;
+ ap->eh_info.dev_action[dev->devno] |= action;
+ ap->eh_info.flags |= ATA_EHI_QUIET;
+ ata_port_schedule_eh(ap);
+
+ spin_unlock_irqrestore(ap->lock, flags);
+
+ /* wait for EH to do the job */
+ ata_port_wait_eh(ap);
+
+ spin_lock_irqsave(ap->lock, flags);
+
+ /* If @sdev is still attached but the associated ATA device
+ * isn't suspended, the operation failed.
+ */
+ if (sdev->sdev_state != SDEV_OFFLINE &&
+ sdev->sdev_state != SDEV_CANCEL && sdev->sdev_state != SDEV_DEL &&
+ !(dev->flags & ATA_DFLAG_SUSPENDED))
+ rc = -EIO;
- return ata_device_resume(dev);
+ out_unlock:
+ spin_unlock_irqrestore(ap->lock, flags);
+ out:
+ if (rc == 0)
+ sdev->sdev_gendev.power.power_state = state;
+ return rc;
}
-int ata_scsi_device_suspend(struct scsi_device *sdev, pm_message_t state)
+/**
+ * ata_scsi_device_resume - resume ATA device associated with sdev
+ * @sdev: the SCSI device to resume
+ *
+ * Request resume EH action on the ATA device associated with
+ * @sdev and return immediately. This enables parallel
+ * wakeup/spinup of devices.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep).
+ *
+ * RETURNS:
+ * 0.
+ */
+int ata_scsi_device_resume(struct scsi_device *sdev)
{
struct ata_port *ap = ata_shost_to_port(sdev->host);
- struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
+ struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
+ struct ata_eh_info *ehi = &ap->eh_info;
+ unsigned long flags;
+ unsigned int action;
+
+ if (!dev)
+ goto out;
+
+ spin_lock_irqsave(ap->lock, flags);
+
+ /* if @sdev is already detached, nothing to do */
+ if (sdev->sdev_state == SDEV_OFFLINE ||
+ sdev->sdev_state == SDEV_CANCEL || sdev->sdev_state == SDEV_DEL)
+ goto out_unlock;
- return ata_device_suspend(dev, state);
+ /* request resume */
+ action = ATA_EH_RESUME;
+ if (sdev->sdev_gendev.power.power_state.event == PM_EVENT_SUSPEND)
+ __ata_ehi_hotplugged(ehi);
+ else
+ action |= ATA_EH_PM_FREEZE | ATA_EH_SOFTRESET;
+ ehi->dev_action[dev->devno] |= action;
+
+ /* We don't want autopsy and verbose EH messages. Disable
+ * those if we're the only device on this link.
+ */
+ if (ata_port_max_devices(ap) == 1)
+ ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
+
+ ata_port_schedule_eh(ap);
+
+ out_unlock:
+ spin_unlock_irqrestore(ap->lock, flags);
+ out:
+ sdev->sdev_gendev.power.power_state = PMSG_ON;
+ return 0;
}
/**
projects / linux-2.6 / commitdiff