linux-kernel - [PATCH] sata_nv: complain on spurious completion notifiers

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Message-id: <45DD2FBF.1040808@shaw.ca>
Date:	Wed, 21 Feb 2007 23:53:03 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-ide@...r.kernel.org, Jeff Garzik <jeff@...zik.org>,
	Andrew Morton <akpm@...l.org>, Tejun Heo <htejun@...il.com>
Subject: [PATCH] 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@...w.ca>

--- 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,
 				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;

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