get_dma_ops() falls into arch-dependant get_arch_dma_ops(), which
historically returns NULL on PowerPC. Therefore dma_set_mask() fails.
This affects Switchtec (and probably other) NTB devices, that they fail
to initialize.
The proposed patch should fix the issue.
---
arch/powerpc/include/asm/dma-mapping.h | 9 +++------
1 file changed, 3 insertions(+), 6 deletions(-)
diff --git a/arch/powerpc/include/asm/dma-mapping.h
b/arch/powerpc/include/asm/dma-mapping.h
index ebf6680..cb6ac96 100644
--- a/arch/powerpc/include/asm/dma-mapping.h
+++ b/arch/powerpc/include/asm/dma-mapping.h
@@ -70,14 +70,11 @@ extern struct dma_map_ops dma_iommu_ops;
#endif
extern const struct dma_map_ops dma_nommu_ops;
+extern const struct dma_map_ops *get_pci_dma_ops(void);
+
static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
{
- /* We don't handle the NULL dev case for ISA for now. We could
- * do it via an out of line call but it is not needed for now. The
- * only ISA DMA device we support is the floppy and we have a hack
- * in the floppy driver directly to get a device for us.
- */
- return NULL;
+ return get_pci_dma_ops();
}
/*
--
2.7.4
