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authorAlan Stern <stern@rowland.harvard.edu>2011-01-25 20:50:07 +0100
committerRafael J. Wysocki <rjw@sisk.pl>2011-01-25 20:50:07 +0100
commitc3810c88788d505d4ffd786addd111b745e42161 (patch)
treecc70c4e1ec62adb4f51cf7e1f45ed296a0475f04 /drivers/base
parentc723fdab8aa728dc2bf0da6a0de8bb9c3f588d84 (diff)
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PM / Runtime: Don't enable interrupts while running in_interrupt
This patch (as1445) fixes a bug in the runtime PM core left over from the addition of the no_callbacks flag. If this flag is set then it is possible for rpm_suspend() to be called in_interrupt, so when releasing spinlocks it's important not to re-enable interrupts. To avoid an unnecessary save-and-restore of the interrupt flag, the patch also inlines a pm_request_idle() call. This fixes Bugzilla #27482. (The offending code was added in 2.6.37, so it's not necessary to apply this to any earlier stable kernels.) Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Reported-by: tim blechmann <tim@klingt.org> CC: <stable@kernel.org> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/power/runtime.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index 656493a..42615b4 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -407,12 +407,15 @@ static int rpm_suspend(struct device *dev, int rpmflags)
goto out;
}
+ /* Maybe the parent is now able to suspend. */
if (parent && !parent->power.ignore_children && !dev->power.irq_safe) {
- spin_unlock_irq(&dev->power.lock);
+ spin_unlock(&dev->power.lock);
- pm_request_idle(parent);
+ spin_lock(&parent->power.lock);
+ rpm_idle(parent, RPM_ASYNC);
+ spin_unlock(&parent->power.lock);
- spin_lock_irq(&dev->power.lock);
+ spin_lock(&dev->power.lock);
}
out: