PM: fix irq enable/disable in runtime PM code

This patch (as1305) fixes a bug in the irq-enable settings and removes
some related overhead in the runtime PM code.

	In __pm_runtime_resume(), within the scope of the original
	spin_lock_irq(), we know that irqs are disabled.  There's no
	reason to go through a pair of enable/disable cycles when
	acquiring and releasing the parent's lock.

	In __pm_runtime_set_status(), irqs are already disabled when
	the parent's lock is acquired, and they must remain disabled
	when it is released.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index a770498..846d89e 100644 (file)
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -328,11 +328,11 @@ int __pm_runtime_resume(struct device *dev, bool from_wq)
                 * necessary.
                 */
                parent = dev->parent;
-               spin_unlock_irq(&dev->power.lock);
+               spin_unlock(&dev->power.lock);
 
                pm_runtime_get_noresume(parent);
 
-               spin_lock_irq(&parent->power.lock);
+               spin_lock(&parent->power.lock);
                /*
                 * We can resume if the parent's run-time PM is disabled or it
                 * is set to ignore children.
@@ -343,9 +343,9 @@ int __pm_runtime_resume(struct device *dev, bool from_wq)
                        if (parent->power.runtime_status != RPM_ACTIVE)
                                retval = -EBUSY;
                }
-               spin_unlock_irq(&parent->power.lock);
+               spin_unlock(&parent->power.lock);
 
-               spin_lock_irq(&dev->power.lock);
+               spin_lock(&dev->power.lock);
                if (retval)
                        goto out;
                goto repeat;
@@ -777,7 +777,7 @@ int __pm_runtime_set_status(struct device *dev, unsigned int status)
        }
 
        if (parent) {
-               spin_lock_irq(&parent->power.lock);
+               spin_lock(&parent->power.lock);
 
                /*
                 * It is invalid to put an active child under a parent that is
@@ -793,7 +793,7 @@ int __pm_runtime_set_status(struct device *dev, unsigned int status)
                                atomic_inc(&parent->power.child_count);
                }
 
-               spin_unlock_irq(&parent->power.lock);
+               spin_unlock(&parent->power.lock);
 
                if (error)
                        goto out;