tile PCI DMA: handle a NULL dev argument properly

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>

diff --git a/arch/tile/kernel/pci-dma.c b/arch/tile/kernel/pci-dma.c
index 7e22e73264a9856d094fbcfbf3667e2155a227e7..adc369d8c77bc0266c7443062da446688c6958fc 100644 (file)
--- a/arch/tile/kernel/pci-dma.c
+++ b/arch/tile/kernel/pci-dma.c
@@ -36,8 +36,9 @@ static void *tile_dma_alloc_coherent(struct device *dev, size_t size,
                                     dma_addr_t *dma_handle, gfp_t gfp,
                                     struct dma_attrs *attrs)
 {
-       u64 dma_mask = dev->coherent_dma_mask ?: DMA_BIT_MASK(32);
-       int node = dev_to_node(dev);
+       u64 dma_mask = (dev && dev->coherent_dma_mask) ?
+               dev->coherent_dma_mask : DMA_BIT_MASK(32);
+       int node = dev ? dev_to_node(dev) : 0;
        int order = get_order(size);
        struct page *pg;
        dma_addr_t addr;