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| author | Lin Ming <ming.m.lin@intel.com> | 2013-03-23 11:42:26 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2013-03-22 22:22:15 -0600 |
| commit | 6c9546675864f51506af69eca388e5d922942c56 (patch) | |
| tree | e689048677a1a066960ffd7ebd8330632476c045 /Documentation/parisc/registers | |
| parent | 66311274691ec65972cad3626057fa8d00c146d8 (diff) | |
| download | linux-6c9546675864f51506af69eca388e5d922942c56.tar.bz2 | |
block: add runtime pm helpers
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 and mark last busy.
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.
The idea and API is designed by Alan Stern and described here:
http://marc.info/?l=linux-scsi&m=133727953625963&w=2
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'Documentation/parisc/registers')
0 files changed, 0 insertions, 0 deletions