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[PATCH] libata: check Word 88 validity in ata_id_xfer_mask()

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Check bit 2 of Word 53 for Word 88 validity before using Word 88 to
determine UDMA mask.  Note that the original xfer mask implementation
using ata_get_mode_mask() didn't consider bit 2 of Word 53.  This
patch introduces different (correct) behavior.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo 2006-03-12 12:34:35 +09:00 committed by Jeff Garzik
parent 2044470ccc
commit fb21f0d0ec
1 changed files with 4 additions and 1 deletions
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5
drivers/scsi/libata-core.c
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@ -819,7 +819,10 @@ static unsigned int ata_id_xfermask(const u16 *id)
}
mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
udma_mask = 0;
if (id[ATA_ID_FIELD_VALID] & (1 << 2))
udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
}