From 6df339a51e3bf18b868384bdeb31e49a4fbaa3d8 Mon Sep 17 00:00:00 2001 From: Lin Ming Date: Sat, 23 Mar 2013 11:42:28 +0800 Subject: [SCSI] sd: change to auto suspend mode Uses block layer runtime pm helper functions in scsi_runtime_suspend/resume for devices that take advantage of it. Remove scsi_autopm_* from sd open/release path and check_events path. Signed-off-by: Lin Ming Signed-off-by: Aaron Lu Acked-by: Alan Stern Signed-off-by: James Bottomley --- drivers/scsi/scsi_pm.c | 84 ++++++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 71 insertions(+), 13 deletions(-) (limited to 'drivers/scsi/scsi_pm.c') diff --git a/drivers/scsi/scsi_pm.c b/drivers/scsi/scsi_pm.c index 8f6b12cbd224..42539ee2cb11 100644 --- a/drivers/scsi/scsi_pm.c +++ b/drivers/scsi/scsi_pm.c @@ -144,33 +144,83 @@ static int scsi_bus_restore(struct device *dev) #ifdef CONFIG_PM_RUNTIME +static int sdev_blk_runtime_suspend(struct scsi_device *sdev, + int (*cb)(struct device *)) +{ + int err; + + err = blk_pre_runtime_suspend(sdev->request_queue); + if (err) + return err; + if (cb) + err = cb(&sdev->sdev_gendev); + blk_post_runtime_suspend(sdev->request_queue, err); + + return err; +} + +static int sdev_runtime_suspend(struct device *dev) +{ + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + int (*cb)(struct device *) = pm ? pm->runtime_suspend : NULL; + struct scsi_device *sdev = to_scsi_device(dev); + int err; + + if (sdev->request_queue->dev) + return sdev_blk_runtime_suspend(sdev, cb); + + err = scsi_dev_type_suspend(dev, cb); + if (err == -EAGAIN) + pm_schedule_suspend(dev, jiffies_to_msecs( + round_jiffies_up_relative(HZ/10))); + return err; +} + 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, - pm ? pm->runtime_suspend : NULL); - if (err == -EAGAIN) - pm_schedule_suspend(dev, jiffies_to_msecs( - round_jiffies_up_relative(HZ/10))); - } + if (scsi_is_sdev_device(dev)) + err = sdev_runtime_suspend(dev); /* Insert hooks here for targets, hosts, and transport classes */ return err; } -static int scsi_runtime_resume(struct device *dev) +static int sdev_blk_runtime_resume(struct scsi_device *sdev, + int (*cb)(struct device *)) { int err = 0; + + blk_pre_runtime_resume(sdev->request_queue); + if (cb) + err = cb(&sdev->sdev_gendev); + blk_post_runtime_resume(sdev->request_queue, err); + + return err; +} + +static int sdev_runtime_resume(struct device *dev) +{ + struct scsi_device *sdev = to_scsi_device(dev); const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + int (*cb)(struct device *) = pm ? pm->runtime_resume : NULL; + + if (sdev->request_queue->dev) + return sdev_blk_runtime_resume(sdev, cb); + else + return scsi_dev_type_resume(dev, cb); +} + +static int scsi_runtime_resume(struct device *dev) +{ + int err = 0; dev_dbg(dev, "scsi_runtime_resume\n"); if (scsi_is_sdev_device(dev)) - err = scsi_dev_type_resume(dev, pm ? pm->runtime_resume : NULL); + err = sdev_runtime_resume(dev); /* Insert hooks here for targets, hosts, and transport classes */ @@ -185,10 +235,18 @@ static int scsi_runtime_idle(struct device *dev) /* Insert hooks here for targets, hosts, and transport classes */ - if (scsi_is_sdev_device(dev)) - err = pm_schedule_suspend(dev, 100); - else + if (scsi_is_sdev_device(dev)) { + struct scsi_device *sdev = to_scsi_device(dev); + + if (sdev->request_queue->dev) { + pm_runtime_mark_last_busy(dev); + err = pm_runtime_autosuspend(dev); + } else { + err = pm_runtime_suspend(dev); + } + } else { err = pm_runtime_suspend(dev); + } return err; } -- cgit v1.2.3