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[ Upstream commit0f74b29a4f] As the potential failure of the dma_map_single(), it should be better to check it and return error if fails. Fixes:1da177e4c3("Linux-2.6.12-rc2") Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>