linux-kernel - [200/244] [SCSI] isci: Leave requests alone if already terminating.

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Date:	Wed, 28 Sep 2011 15:02:44 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Jeff Skirvin <jeffrey.d.skirvin@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	James Bottomley <JBottomley@...allels.com>
Subject: [200/244] [SCSI] isci: Leave requests alone if already terminating.

3.0-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Jeff Skirvin <jeffrey.d.skirvin@...el.com>

commit 39ea2c5b5ffaa344467da53e885cfa4ac0105050 upstream.

Instead of immediately completing any request that has a second
termination call made on it, wait for the TC done/abort HW event.

Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@...el.com>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: James Bottomley <JBottomley@...allels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/scsi/isci/request.c |   12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

--- a/drivers/scsi/isci/request.c
+++ b/drivers/scsi/isci/request.c
@@ -732,12 +732,20 @@ sci_io_request_terminate(struct isci_req
 		sci_change_state(&ireq->sm, SCI_REQ_ABORTING);
 		return SCI_SUCCESS;
 	case SCI_REQ_TASK_WAIT_TC_RESP:
+		/* The task frame was already confirmed to have been
+		 * sent by the SCU HW.  Since the state machine is
+		 * now only waiting for the task response itself,
+		 * abort the request and complete it immediately
+		 * and don't wait for the task response.
+		 */
 		sci_change_state(&ireq->sm, SCI_REQ_ABORTING);
 		sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
 		return SCI_SUCCESS;
 	case SCI_REQ_ABORTING:
-		sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
-		return SCI_SUCCESS;
+		/* If a request has a termination requested twice, return
+		 * a failure indication, since HW confirmation of the first
+		 * abort is still outstanding.
+		 */
 	case SCI_REQ_COMPLETED:
 	default:
 		dev_warn(&ireq->owning_controller->pdev->dev,


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