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mm: cma: Don't crash on allocation if CMA area can't be activated

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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: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
This commit is contained in:
Laurent Pinchart 2014-10-24 13:18:39 +03:00 committed by Marek Szyprowski
parent cac7f24298
commit f022d8cb7e
1 changed files with 1 additions and 0 deletions
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mm/cma.c
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@ -124,6 +124,7 @@ static int __init cma_activate_area(struct cma *cma)
err:
kfree(cma->bitmap);
cma->count = 0;
return -EINVAL;
}