> And as xfermask stripped out DMA bits, host->simplex_claimed
> is always NULL with current implementation.
>
> By allowing DMA either if simplex_claimed is NULL or if it
> points to current port DMA can be finally used - it gets
> assigned to first port which contains any DMA capable
> device.
Doh, sorry I should have caught that when testing.
> Signed-off-by: Petr Vandrovec <petr@xxxxxxxxxxxxxx>
Acked-by: Alan Cox <alan@xxxxxxxxxx>
>
> diff -uprdN linux/drivers/ata/libata-core.c linux/drivers/ata/libata-core.c
> --- linux/drivers/ata/libata-core.c 2007-03-07 22:13:24.000000000 -0800
> +++ linux/drivers/ata/libata-core.c 2007-03-08 00:15:37.000000000 -0800
> @@ -3455,7 +3455,8 @@ static void ata_dev_xfermask(struct ata_
> "device is on DMA blacklist, disabling DMA\n");
> }
>
> - if ((host->flags & ATA_HOST_SIMPLEX) && host->simplex_claimed != ap) {
> + if ((host->flags & ATA_HOST_SIMPLEX) &&
> + host->simplex_claimed && host->simplex_claimed != ap) {
> xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
> ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
> "other device, disabling DMA\n");
> -
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