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由 Thierry Reding 提交于
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: NSean Paul <seanpaul@chromium.org> Reviewed-by: NSean Paul <seanpaul@chromium.org> Signed-off-by: NThierry Reding <treding@nvidia.com>
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