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Alex Elder abe9a3006f greybus: first operation error prevails
If an operation already has an error result recorded, don't
overwrite it with a new error code.

In order to ensure a request completes exactly once, return a
Boolean indicating whether setting the result was successful.  If
two threads are racing to complete an operation (for example if a
slow-but-normal response message arrives at the same time timeout
processing commences) only the one that sets the final result
will finish its activity.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
2014-11-25 13:18:16 -08:00
drivers/staging/greybus greybus: first operation error prevails 2014-11-25 13:18:16 -08:00