linux-kernel - [25/45] USB: EHCI: fix counting of transaction error retries

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Date:	Tue, 30 Mar 2010 15:48:45 -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,
	Alan Stern <stern@...land.harvard.edu>,
	Reinoud Koornstra <koornstra@...com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [25/45] USB: EHCI: fix counting of transaction error retries

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

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

From: Alan Stern <stern@...land.harvard.edu>

commit ef4638f955f2c4a667c8af20769d03f5ed3781ca upstream.

This patch (as1274) simplifies the counting of transaction-error
retries.  Now we will count up from 0 to QH_XACTERR_MAX instead of
down from QH_XACTERR_MAX to 0.

The patch also fixes a small bug: qh->xacterr was not getting
initialized for interrupt endpoints.

Signed-off-by: Alan Stern <stern@...land.harvard.edu>
Tested-by: Matthijs Kooijman <matthijs@...in.nl>
Cc: Reinoud Koornstra <koornstra@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/usb/host/ehci-q.c     |   11 +++++------
 drivers/usb/host/ehci-sched.c |    1 +
 2 files changed, 6 insertions(+), 6 deletions(-)

--- a/drivers/usb/host/ehci-q.c
+++ b/drivers/usb/host/ehci-q.c
@@ -346,12 +346,11 @@ qh_completions (struct ehci_hcd *ehci, s
 				 */
 				if ((token & QTD_STS_XACT) &&
 						QTD_CERR(token) == 0 &&
-						--qh->xacterrs > 0 &&
+						++qh->xacterrs < QH_XACTERR_MAX &&
 						!urb->unlinked) {
 					ehci_dbg(ehci,
-	"detected XactErr len %d/%d retry %d\n",
-	qtd->length - QTD_LENGTH(token), qtd->length,
-	QH_XACTERR_MAX - qh->xacterrs);
+	"detected XactErr len %zu/%zu retry %d\n",
+	qtd->length - QTD_LENGTH(token), qtd->length, qh->xacterrs);
 
 					/* reset the token in the qtd and the
 					 * qh overlay (which still contains
@@ -451,7 +450,7 @@ halt:
 		last = qtd;
 
 		/* reinit the xacterr counter for the next qtd */
-		qh->xacterrs = QH_XACTERR_MAX;
+		qh->xacterrs = 0;
 	}
 
 	/* last urb's completion might still need calling */
@@ -898,7 +897,7 @@ static void qh_link_async (struct ehci_h
 	head->qh_next.qh = qh;
 	head->hw_next = dma;
 
-	qh->xacterrs = QH_XACTERR_MAX;
+	qh->xacterrs = 0;
 	qh->qh_state = QH_STATE_LINKED;
 	/* qtd completions reported later by interrupt */
 }
--- a/drivers/usb/host/ehci-sched.c
+++ b/drivers/usb/host/ehci-sched.c
@@ -542,6 +542,7 @@ static int qh_link_periodic (struct ehci
 		}
 	}
 	qh->qh_state = QH_STATE_LINKED;
+	qh->xacterrs = 0;
 	qh_get (qh);
 
 	/* update per-qh bandwidth for usbfs */


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