From: broonie@sirena.org.uk <broonie@sirena.org.uk>
Date: Wed, 14 Mar 2007 19:49:15 +0000 (+0000)
Subject: natsemi: Avoid IntrStatus lossage if RX state machine resets.
X-Git-Tag: v2.6.21-rc4~1^2
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d2a900365b8963d7ca46f05d8e7176d1be3cc71d;p=linux-2.6

natsemi: Avoid IntrStatus lossage if RX state machine resets.

This patch fixes the poll routine for the natsemi driver so that if the
driver detects an RX state machine lockup then no interrupts will be
lost while the driver recovers from that.

Signed-Off-By: Mark Brown <broonie@sirena.org.uk>

Signed-off-by: Jeff Garzik <jeff@garzik.org>
---

diff --git a/drivers/net/natsemi.c b/drivers/net/natsemi.c
index 5f88200724..349b96a3ec 100644
--- a/drivers/net/natsemi.c
+++ b/drivers/net/natsemi.c
@@ -2169,6 +2169,14 @@ static int natsemi_poll(struct net_device *dev, int *budget)
 			       dev->name, np->intr_status,
 			       readl(ioaddr + IntrMask));
 
+		/* netdev_rx() may read IntrStatus again if the RX state
+		 * machine falls over so do it first. */
+		if (np->intr_status &
+		    (IntrRxDone | IntrRxIntr | RxStatusFIFOOver |
+		     IntrRxErr | IntrRxOverrun)) {
+			netdev_rx(dev, &work_done, work_to_do);
+		}
+
 		if (np->intr_status &
 		    (IntrTxDone | IntrTxIntr | IntrTxIdle | IntrTxErr)) {
 			spin_lock(&np->lock);
@@ -2180,12 +2188,6 @@ static int natsemi_poll(struct net_device *dev, int *budget)
 		if (np->intr_status & IntrAbnormalSummary)
 			netdev_error(dev, np->intr_status);
 
-		if (np->intr_status &
-		    (IntrRxDone | IntrRxIntr | RxStatusFIFOOver |
-		     IntrRxErr | IntrRxOverrun)) {
-			netdev_rx(dev, &work_done, work_to_do);
-		}
-
 		*budget -= work_done;
 		dev->quota -= work_done;