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[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>
This commit is contained in:
Mark Lord 2006-03-21 21:11:53 -05:00 committed by Jeff Garzik
parent a6cce2a79d
commit 806a6e7a99
1 changed files with 4 additions and 1 deletions
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5
drivers/scsi/sata_mv.c
View File

@ -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;
}
/**