Messages in this thread | | | Date | Tue, 18 Nov 2003 09:46:52 +0000 | From | Christoph Hellwig <> | Subject | Re: DMA_NONE data_direction in scsi |
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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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