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greybus: loopback: masked out threads should sleep

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If a thread is masked out it should not consume CPU cycles during a test.
We set an arbitrary 100 millisecond sleep time for each masked out thread.
Reasonably blunt instrument to ensure threads with nothing to do don't end
up thrashing the acquisition/release of mutexes.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Patrick Titiano <ptitiano@baylibre.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Bryan O'Donoghue 2015-09-23 09:31:32 -07:00 committed by Greg Kroah-Hartman
parent f01f7a9851
commit 42d7f7e884
1 changed files with 3 additions and 1 deletions
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4
drivers/staging/greybus/loopback.c
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@ -693,8 +693,10 @@ static int gb_loopback_fn(void *data)
break;
mutex_lock(&gb_dev.mutex);
if (!gb_loopback_active(gb))
if (!gb_loopback_active(gb)) {
ms_wait = 100;
goto unlock_continue;
}
if (gb_dev.iteration_max) {
/* Determine overall lowest count */
low_count = gb->iteration_count;