From: Andrew Morton <akpm@linux-foundation.org>
Date: Tue, 6 Jan 2009 22:43:08 +0000 (-0800)
Subject: dma_alloc_from_coherent(): fix fallback to generic memory
X-Git-Tag: v2.6.29-rc1~237
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0bef3c2dc7d0c8238330785c8f4504761b0e370b;p=pandora-kernel.git

dma_alloc_from_coherent(): fix fallback to generic memory

If bitmap_find_free_region() fails and DMA_MEMORY_EXCLUSIVE is not set,
the function will fail to write anything to *ret and will return 1.             This will cause dma_alloc_coherent() to return an uninitialised value,
crashing the kernel, perhaps via DMA to a random address.

Fix that by changing it to return zero in this case, so the caller will
proceed to allocate the memory from the generic memory allocator.

Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Cc: Dmitry Baryshkov <dbaryshkov@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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