[PATCH] libata - fix bracketing and DMA oops

The upstream tree has the ATA_DFLAG_PIO bug fixed but does not have the
pass throuugh bug fix

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/scsi/libata-scsi.c b/drivers/scsi/libata-scsi.c
index 2007b4b6e1b4..3ce7c198ff0d 100644
--- a/drivers/scsi/libata-scsi.c
+++ b/drivers/scsi/libata-scsi.c
@@ -1921,7 +1921,7 @@ unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf,
                 return 0;
 
         dpofua = 0;
-        if (ata_dev_supports_fua(args->id) && dev->flags & ATA_DFLAG_LBA48 &&
+        if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) &&
             (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
                 dpofua = 1 << 4;
 
@@ -2408,9 +2408,14 @@ ata_scsi_pass_thru(struct ata_queued_cmd *qc, const u8 *scsicmd)
 {
         struct ata_taskfile *tf = &(qc->tf);
         struct scsi_cmnd *cmd = qc->scsicmd;
+        struct ata_device *dev = qc->dev;
 
         if ((tf->protocol = ata_scsi_map_proto(scsicmd[1])) == ATA_PROT_UNKNOWN)
                 goto invalid_fld;
+                
+        /* We may not issue DMA commands if no DMA mode is set */
+        if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0)
+                goto invalid_fld;
 
         if (scsicmd[1] & 0xe0)
                 /* PIO multi not supported yet */