Re: DMA_NONE data_direction in scsi
From: Christoph Hellwig (hch_at_infradead.org)
Date: 11/18/03
- Previous message: Russell King: "Re: Bootmem broke ARM"
- In reply to: Guennadi Liakhovetski: "DMA_NONE data_direction in scsi"
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Date: Tue, 18 Nov 2003 09:46:52 +0000 To: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
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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- Previous message: Russell King: "Re: Bootmem broke ARM"
- In reply to: Guennadi Liakhovetski: "DMA_NONE data_direction in scsi"
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