mm: cma: Don't crash on allocation if CMA area can't be activated
If activation of the CMA area fails its mutex won't be initialized, leading to an oops at allocation time when trying to lock the mutex. Fix this by setting the cma area count field to 0 when activation fails, leading to allocation returning NULL immediately. Cc: <stable@vger.kernel.org> # v3.17 Signed-off-by: NLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Acked-by: NMichal Nazarewicz <mina86@mina86.com> Signed-off-by: NMarek Szyprowski <m.szyprowski@samsung.com>
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