[PATCH] sata_nv: complain on spurious completion notifiers

From: Robert Hancock
Date: Thu Feb 22 2007 - 00:54:54 EST

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@xxxxxxx>

--- linux-2.6.21-rc1edit/drivers/ata/sata_nv.c.prev 2007-02-21 22:17:31.000000000 -0600
+++ linux-2.6.21-rc1edit/drivers/ata/sata_nv.c 2007-02-21 22:22:14.000000000 -0600
@@ -740,6 +740,17 @@ static int nv_adma_check_cpb(struct ata_
DPRINTK("Completing qc from tag %d with err_mask %u\n",cpb_num,
+ } 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;

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