tile PCI DMA: handle a NULL dev argument properly

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

1 files changed, 3 insertions, 2 deletions

diff --git a/arch/tile/kernel/pci-dma.c b/arch/tile/kernel/pci-dma.c
index 7e22e73264a9..adc369d8c77b 100644
--- 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;