From: Thierry Reding <treding@nvidia.com>
Date: Thu, 6 Nov 2014 13:41:31 +0000 (+0100)
Subject: drm/tegra: gem: Check before freeing CMA memory
X-Git-Tag: omap-for-v3.20/drop-legacy-3517~77^2~61^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7e0180e3570cc791e95e6b6cd5fbeb0aedc62776;p=pandora-kernel.git

drm/tegra: gem: Check before freeing CMA memory

dma_free_writecombine() must not be called on a buffer that couldn't be
allocated. Check for a valid virtual address before attempting to free
the memory to avoid a crash.

Reported-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>
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