Re: dma_ops->map_page == NULL

[Jon Smirl <jonsmirl@gmail.com>]

On Mon, Jul 6, 2009 at 1:51 PM, K=E1ri Dav=ED=F0sson<kari.davidsson@marel.c=
om> wrote:
> I am doing a driver that uses dma_map_single().
>
> After changing to to linux 2.6.29.3 I am getting
> segfaults in dma_map_single() because dma_ops->map_page is NULL.
> Actually dma_ops looks funky too.
>
> The driver is an of_platform_driver which is declared as an child of
> the lbp (fsl,lpb) node of the device tree.
>
> This is on powerpc 5200b platform.

I have hit this before, in my case the driver pointer was null. It
faulted on dma_ops->map_page which had nothing to do with the real
problem which was the null driver pointer. I spent a long time looking
at this until I figured out that the reported error was bogus compared
to the actual problem.


>
> rg
> kd
>
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--=20
Jon Smirl
jonsmirl@gmail.com