[PATCH] libata-sff: Don't call bmdma_stop on non DMA capable controllers

[Alan <alan@lxorguk.ukuu.org.uk>]

Fixes bogus accesses to ports 0-15 with a non DMA capable controller.
This I think should go in for 2.6.20

Arguably it shouldn't be called for PIO commands at all but thats a
matter for Jeff to decide 

Signed-off-by: Alan Cox <alan@redhat.com>

diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.20-rc4-mm1/drivers/ata/libata-sff.c linux-2.6.20-rc4-mm1/drivers/ata/libata-sff.c
--- linux.vanilla-2.6.20-rc4-mm1/drivers/ata/libata-sff.c	2007-01-22 16:26:50.000000000 +0000
+++ linux-2.6.20-rc4-mm1/drivers/ata/libata-sff.c	2007-01-24 17:31:40.000000000 +0000
@@ -827,7 +827,8 @@
  */
 void ata_bmdma_post_internal_cmd(struct ata_queued_cmd *qc)
 {
-	ata_bmdma_stop(qc);
+	if (qc->ap->ioaddr.bmdma_addr)
+		ata_bmdma_stop(qc);
 }
 
 #ifdef CONFIG_PCI
-
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