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Alex Elder f34541d7e8 greybus: ignore a null cookie when canceling buffer 
It's possible for an in-flight buffer to be recorded as sent *after*
a thread has begin the process of canceling it.  In that case the
Greybus message cookie will be set to NULL, and that value can end
up getting passed to buffer_cancel().  Change buffer_cancel() so
it properly handles (ignores) a null cookie pointer.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
History 2014-11-25 15:06:43 -08:00
drivers/staging/greybus greybus: ignore a null cookie when canceling buffer 2014-11-25 15:06:43 -08:00