On Wed, 30 Jan 2013, Aaron Lu wrote:
> From: Lin Ming <ming.m.lin@xxxxxxxxx>
>
> Add runtime pm helper functions:
>
> void blk_pm_runtime_init(struct request_queue *q, struct device *dev)
> - Initialization function for drivers to call.
>
> int blk_pre_runtime_suspend(struct request_queue *q)
> - If any requests are in the queue, mark last busy and return -EBUSY.
> Otherwise set q->rpm_status to RPM_SUSPENDING and return 0.
>
> void blk_post_runtime_suspend(struct request_queue *q, int err)
> - If the suspend succeeded then set q->rpm_status to RPM_SUSPENDED.
> Otherwise set it to RPM_ACTIVE.
>
> void blk_pre_runtime_resume(struct request_queue *q)
> - Set q->rpm_status to RPM_RESUMING.
>
> void blk_post_runtime_resume(struct request_queue *q, int err)
> - If the resume succeeded then set q->rpm_status to RPM_ACTIVE
> and call __blk_run_queue, then mark last busy and autosuspend.
> Otherwise set q->rpm_status to RPM_SUSPENDED.
>
> Signed-off-by: Lin Ming <ming.m.lin@xxxxxxxxx>
> Signed-off-by: Aaron Lu <aaron.lu@xxxxxxxxx>
> +void blk_pm_runtime_init(struct request_queue *q, struct device *dev)
> +{
> + q->dev = dev;
> + q->rpm_status = RPM_ACTIVE;
> + pm_runtime_set_autosuspend_delay(q->dev, -1);
> + pm_runtime_use_autosuspend(q->dev);
> + pm_runtime_mark_last_busy(q->dev);
> + pm_runtime_autosuspend(q->dev);
This last line is no longer needed. It can't do anything useful, since
autosuspends are disabled (the delay is -1).
Alan Stern
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