Rafael J. Wysocki 49dd63a6dd
PM: runtime: Add safety net to supplier device release ...
[ Upstream commit d1579e61192e0e686faa4208500ef4c3b529b16c ]
Because refcount_dec_not_one() returns true if the target refcount
becomes saturated, it is generally unsafe to use its return value as
a loop termination condition, but that is what happens when a device
link's supplier device is released during runtime PM suspend
operations and on device link removal.
To address this, introduce pm_runtime_release_supplier() to be used
in the above cases which will check the supplier device's runtime
PM usage counter in addition to the refcount_dec_not_one() return
value, so the loop can be terminated in case the rpm_active refcount
value becomes invalid, and update the code in question to use it as
appropriate.
This change is not expected to have any visible functional impact.
Reported-by: Peter Zijlstra <peterz@infradead.org >
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com >
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org >
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org >
Signed-off-by: Sasha Levin <sashal@kernel.org >
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Rafael J. Wysocki
49dd63a6dd