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vlsi_alloc_ring() checks for DMA mapping errors by comparing returned address with zero, while pci_dma_mapping_error() should be used. Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru> Signed-off-by: David S. Miller <davem@davemloft.net>