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PM / runtime: Drop usage count for suppliers at device link removal
In the case consumer device is runtime resumed, while the link to the
supplier is removed, the earlier call to pm_runtime_get_sync() made from
rpm_get_suppliers() does not get properly balanced with a corresponding
call to pm_runtime_put(). This leads to that suppliers remains to be
runtime resumed forever, while they don't need to.
Let's fix the behaviour by calling rpm_put_suppliers() when dropping a
device link. Not that, since rpm_put_suppliers() checks the
link->rpm_active flag, we can correctly avoid to call pm_runtime_put() in
cases when we shouldn't.
Reported-by: Todor Tomov <todor.tomov@linaro.org>
Fixes: 21d5c57b37
(PM / runtime: Use device links)
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@ -1586,6 +1586,8 @@ void pm_runtime_new_link(struct device *dev)
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void pm_runtime_drop_link(struct device *dev)
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void pm_runtime_drop_link(struct device *dev)
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{
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{
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rpm_put_suppliers(dev);
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spin_lock_irq(&dev->power.lock);
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spin_lock_irq(&dev->power.lock);
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WARN_ON(dev->power.links_count == 0);
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WARN_ON(dev->power.links_count == 0);
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dev->power.links_count--;
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dev->power.links_count--;
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