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path: root/drivers/scsi/libata-core.c
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Diffstat (limited to 'drivers/scsi/libata-core.c')
-rw-r--r--drivers/scsi/libata-core.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index c17df3f22fd..439b6db1380 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -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);
}