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ep_io() uses a completion on stack and open codes the waiting with:
wait_event_interruptible (done.wait, done.done);
and
wait_event (done.wait, done.done);
This waits in non-exclusive mode for complete(), but there is no reason to
do so because the completion can only be waited for by the task itself and
complete() wakes exactly one exlusive waiter.
Replace the open coded implementation with the corresponding
wait_for_completion*() functions.
No functional change.
Reported-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lkml.kernel.org/r/20200321113241.043380271@linutronix.de
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