diff options
| author |   Mark Lord <mlord@pobox.com> | 2006-03-21 21:11:53 -0500 |
|---|---|---|
| committer |   Jeff Garzik <jeff@garzik.org> | 2006-03-21 21:11:53 -0500 |
| commit | 806a6e7a9904d4a1dfd3fd79d373bf31d71d34cb (patch) | |
| tree | a88aa5b3e7aa20fb144686b5b36ce88282f923ad /drivers/scsi/sata_mv.c | |
| parent | [PATCH] libata: ata_scsi_slave_config cleanup (diff) | |
| download | linux-dev-806a6e7a9904d4a1dfd3fd79d373bf31d71d34cb.tar.xz linux-dev-806a6e7a9904d4a1dfd3fd79d373bf31d71d34cb.zip | |
[libata] sata_mv: off-by-1 fix
This patch addresses a number of weird behaviours observed
for the sata_mv driver, by fixing an "off by one" bug in processing
of the EDMA response queue.
Basically, sata_mv was looking in the wrong place for
command results, and this produced a lot of unpredictable behaviour.
Signed-off-by: Mark Lord <mlord@pobox.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers/scsi/sata_mv.c')
| -rw-r--r-- | drivers/scsi/sata_mv.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/scsi/sata_mv.c b/drivers/scsi/sata_mv.c index e561281967dd..eed67ae2dc08 100644 --- a/drivers/scsi/sata_mv.c +++ b/drivers/scsi/sata_mv.c @@ -1263,6 +1263,7 @@ static u8 mv_get_crpb_status(struct ata_port *ap) void __iomem *port_mmio = mv_ap_base(ap); struct mv_port_priv *pp = ap->private_data; u32 out_ptr; + u8 ata_status; out_ptr = readl(port_mmio + EDMA_RSP_Q_OUT_PTR_OFS); @@ -1270,6 +1271,8 @@ static u8 mv_get_crpb_status(struct ata_port *ap) WARN_ON(((out_ptr >> EDMA_RSP_Q_PTR_SHIFT) & MV_MAX_Q_DEPTH_MASK) != pp->rsp_consumer); + ata_status = pp->crpb[pp->rsp_consumer].flags >> CRPB_FLAG_STATUS_SHIFT; + /* increment our consumer index... */ pp->rsp_consumer = mv_inc_q_index(&pp->rsp_consumer); @@ -1284,7 +1287,7 @@ static u8 mv_get_crpb_status(struct ata_port *ap) writelfl(out_ptr, port_mmio + EDMA_RSP_Q_OUT_PTR_OFS); /* Return ATA status register for completed CRPB */ - return (pp->crpb[pp->rsp_consumer].flags >> CRPB_FLAG_STATUS_SHIFT); + return ata_status; } /** |