[PATCH] powerpc/pci-hotplug: fix the rescanned pci device's dma_set_mask issue

[Yuanquan Chen <B41889@freescale.com>]

On powerpc arch, dma_ops of rescanned pci device after system's booting up won't be
initialized by system, so it will fail to execute the dma_set_mask in the device's
driver. Initialize it to solve this issue.

Signed-off-by: Yuanquan Chen <B41889@freescale.com>
---
 arch/powerpc/include/asm/dma-mapping.h |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/include/asm/dma-mapping.h b/arch/powerpc/include/asm/dma-mapping.h
index 7816087..22eae53 100644
--- a/arch/powerpc/include/asm/dma-mapping.h
+++ b/arch/powerpc/include/asm/dma-mapping.h
@@ -126,8 +126,11 @@ static inline int dma_supported(struct device *dev, u64 mask)
 {
 	struct dma_map_ops *dma_ops = get_dma_ops(dev);
 
-	if (unlikely(dma_ops == NULL))
-		return 0;
+	if (unlikely(dma_ops == NULL)) {
+		set_dma_ops(dev, &dma_direct_ops);
+		set_dma_offset(dev, PCI_DRAM_OFFSET);
+		dma_ops = &dma_direct_ops;
+	}
 	if (dma_ops->dma_supported == NULL)
 		return 1;
 	return dma_ops->dma_supported(dev, mask);
-- 
1.7.9.5