Add Seagate STT20000A to DMA blacklist.

[Dave Jones]

http://bugzilla.kernel.org/show_bug.cgi?id=1044 points out an
additional hard disk that doesn't handle DMA transfers correctly.
This patch is the libata variant of the earlier patch to drivers/ide/

Signed-off-by: Dave Jones <davej@xxxxxxxxxx>

--- linux-2.6/drivers/ata/libata-core.c~	2007-05-21 14:27:40.000000000 -0400
+++ linux-2.6/drivers/ata/libata-core.c	2007-05-21 14:28:48.000000000 -0400
@@ -3771,6 +3771,7 @@ static const struct ata_blacklist_entry 
 	{ "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,ATA_HORKAGE_NODMA },
 	{ "_NEC DV5800A", 	NULL,		ATA_HORKAGE_NODMA },
 	{ "SAMSUNG CD-ROM SN-124","N001",	ATA_HORKAGE_NODMA },
+	{ "Seagate STT20000A", NULL,		ATA_HORKAGE_NODMA },
 
 	/* Weird ATAPI devices */
 	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 |

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