diff options
| author | Alan Stern <stern@rowland.harvard.edu> | 2011-01-25 22:50:07 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rjw@sisk.pl> | 2011-01-25 22:50:07 +0300 |
| commit | c3810c88788d505d4ffd786addd111b745e42161 (patch) | |
| tree | cc70c4e1ec62adb4f51cf7e1f45ed296a0475f04 /drivers/base | |
| parent | c723fdab8aa728dc2bf0da6a0de8bb9c3f588d84 (diff) | |
| download | linux-c3810c88788d505d4ffd786addd111b745e42161.tar.xz | |
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.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c index 656493a5e073..42615b419dfb 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: |