Re: DMA_NONE data_direction in scsi

[Christoph Hellwig]

On Mon, Nov 17, 2003 at 08:25:19PM +0100, Guennadi Liakhovetski wrote:
> While trying to fix tmscsim for 2.6, I've arrived at the Oops below, which
> is caused by the BUG_ON() in dma_map_page(). In the backtrace below,
> data_direction is set to DMA_BIDIRECTIONAL in sd_revalidate_disk(),
> 
>                 sreq->sr_data_direction = DMA_BIDIRECTIONAL;
> 
> , but already in sd_spinup_disk() it is reset to DMA_NONE:
> 
>                         SRpnt->sr_data_direction = DMA_NONE;
> 
> So, the question is: is this the correct behaviour, and, if so - how is
> the driver supposed to map this request - which direction to pass to
> dma_map_*?

DMA_NONE means there's nothing to map.

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