On Nov 22, 2012, at 10:29 PM, Yuanquan Chen wrote:
> 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 <[email protected]>
> ---
> arch/powerpc/include/asm/dma-mapping.h | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
This is not the right way to get the dma_ops setup. You need to find some
other point for the hotplug scenario to get the dma_ops setup.
- k
>
> 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
>
>
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