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Merge "block: Fix a race in the runtime power management code"

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qctecmdr 2020-08-26 17:22:52 -07:00 • committed by Gerrit - the friendly Code Review server
commit c1d2ca05ee
1 changed files with 9 additions and 7 deletions
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16
block/blk-pm.c
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@ -67,6 +67,10 @@ int blk_pre_runtime_suspend(struct request_queue *q)
WARN_ON_ONCE(q->rpm_status != RPM_ACTIVE);
spin_lock_irq(&q->queue_lock);
q->rpm_status = RPM_SUSPENDING;
spin_unlock_irq(&q->queue_lock);
/*
* Increase the pm_only counter before checking whether any
* non-PM blk_queue_enter() calls are in progress to avoid that any
@ -89,15 +93,13 @@ int blk_pre_runtime_suspend(struct request_queue *q)
/* Switch q_usage_counter back to per-cpu mode. */
blk_mq_unfreeze_queue(q);
spin_lock_irq(&q->queue_lock);
if (ret < 0)
if (ret < 0) {
spin_lock_irq(&q->queue_lock);
q->rpm_status = RPM_ACTIVE;
pm_runtime_mark_last_busy(q->dev);
else
q->rpm_status = RPM_SUSPENDING;
spin_unlock_irq(&q->queue_lock);
if (ret)
spin_unlock_irq(&q->queue_lock);
blk_clear_pm_only(q);
}
return ret;
}