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pci_dma_mapping_error can't be used for pci_alloc_consistent (pci_dma_mapping_error is for dma_map_single and dma_map_page). pci_alloc_consistent returns NULL if the allocation fails. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Acked-by: Igor M. Liplianin <liplianin@me.by> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>