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sata_nv: complain on spurious completion notifiers 

Recently Tejun wrote a patch to ahci.c to make it raise a HSM violation
if the drive attempted to complete a tag that wasn't outstanding. We could
run into the same problem with sata_nv ADMA. This adds code to raise a HSM
violation error if the controller gives us a notifier tag that isn't
outstanding, since the drive may be issuing spurious completions.

Signed-off-by: Robert Hancock <hancockr@shaw.ca>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Robert Hancock 2007-02-21 23:53:03 -06:00 committed by Jeff Garzik
parent 32d9091156
commit 2a54cf76d1
1 changed files with 11 additions and 0 deletions
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11
drivers/ata/sata_nv.c
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@ -740,6 +740,17 @@ static int nv_adma_check_cpb(struct ata_port *ap, int cpb_num, int force_err)
DPRINTK("Completing qc from tag %d with err_mask %u\n",cpb_num,
qc->err_mask);
ata_qc_complete(qc);
} else {
struct ata_eh_info *ehi = &ap->eh_info;
/* Notifier bits set without a command may indicate the drive
is misbehaving. Raise host state machine violation on this
condition. */
ata_port_printk(ap, KERN_ERR, "notifier for tag %d with no command?\n",
cpb_num);
ehi->err_mask |= AC_ERR_HSM;
ehi->action |= ATA_EH_SOFTRESET;
ata_port_freeze(ap);
return 1;
}
}
return 0;