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drm/rockchip: fix dma_alloc_attrs() error check
authorDaniel Kurtz <djkurtz@chromium.org>
Wed, 7 Jan 2015 09:27:06 +0000 (17:27 +0800)
committerMark Yao <mark.yao@rock-chips.com>
Fri, 9 Jan 2015 03:29:06 +0000 (11:29 +0800)
dma_alloc_attrs() returns NULL if it cannot allocate a dma buffer (or
mapping), not a negative error code.

Rerported-by: Pawel Osciak <posciak@chromium.org>
Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Mark Yao <mark.yao@rock-chips.com>

No differences found
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