[PATCH] libata: Fix heuristic typos add LBA48PIO flag and support code, add IRQ flag for next diff

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index b42acbe0e9a5..e6044455ca45 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -611,6 +611,10 @@ int ata_rwcmd_protocol(struct ata_queued_cmd *qc)
         if (dev->flags & ATA_DFLAG_PIO) {
                 tf->protocol = ATA_PROT_PIO;
                 index = dev->multi_count ? 0 : 8;
+        } else if (lba48 && (qc->ap->flags & ATA_FLAG_PIO_LBA48)) {
+                /* Unable to use DMA due to host limitation */
+                tf->protocol = ATA_PROT_PIO;
+                index = dev->multi_count ? 0 : 4;
         } else {
                 tf->protocol = ATA_PROT_DMA;
                 index = 16;