Allow libata.pata_dma=0 to disable DMA (default is 1) SATA is unaffected as disabling DMA for SATA makes no sense at all. Signed-off-by: Alan Cox <alan@xxxxxxxxxx> diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.22-rc4-mm2/drivers/ata/libata-core.c linux-2.6.22-rc4-mm2/drivers/ata/libata-core.c --- linux.vanilla-2.6.22-rc4-mm2/drivers/ata/libata-core.c 2007-06-07 14:26:08.000000000 +0100 +++ linux-2.6.22-rc4-mm2/drivers/ata/libata-core.c 2007-06-07 16:53:43.000000000 +0100 @@ -94,6 +94,10 @@ module_param_named(ignore_hpa, ata_ignore_hpa, int, 0644); MODULE_PARM_DESC(ignore_hpa, "Ignore HPA limit (0=keep BIOS limits, 1=ignore limits, using full disk)"); +static int ata_pata_dma = 1; +module_param_named(pata_dma, ata_pata_dma, int, 0644); +MODULE_PARM_DESC(pata_dma, "Use DMA on PATA devices"); + static int ata_probe_timeout = ATA_TMOUT_INTERNAL / HZ; module_param(ata_probe_timeout, int, 0444); MODULE_PARM_DESC(ata_probe_timeout, "Set ATA probing timeout (seconds)"); @@ -2815,7 +2831,12 @@ ata_dev_xfermask(dev); pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0); - dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask); + + if (ata_pata_dma || ap->cbl == ATA_CBL_SATA) + dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask); + else + dma_mask = 0; + dev->pio_mode = ata_xfer_mask2mode(pio_mask); dev->dma_mode = ata_xfer_mask2mode(dma_mask); - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
