From: Roel Kluin <roel.kluin@gmail.com>
Date: Wed, 4 Mar 2009 08:05:56 +0000 (-0800)
Subject: net pcmcia: worklimit reaches -1
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=b9bdcd9bd78d253dcc8e13c29f0acd67e080e7c1;p=openwrt%2Fstaging%2Fblogic.git

net pcmcia: worklimit reaches -1

with while (--worklimit >= 0); worklimit reaches -1 after the loop. In
3c589_cs.c this caused a warning not to be printed.

In 3c574_cs.c contrastingly, el3_rx() treats worklimit differently:

static int el3_rx(struct net_device *dev, int worklimit)
{
	while (--worklimit >= 0) { ... }
	return worklimit;
}

el3_rx() is only called by function el3_interrupt(): twice:

static irqreturn_t el3_interrupt(int irq, void *dev_id)
{
        int work_budget = max_interrupt_work;
	while(...) {
		if (...)
			work_budget = el3_rx(dev, work_budget);
		if (...)
			work_budget = el3_rx(dev, work_budget);
		if (--work_budget < 0) {
		        ...
		        break;
		}
	}
}
The error path can occur 2 too early.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/pcmcia/3c574_cs.c b/drivers/net/pcmcia/3c574_cs.c
index e5cb6b1f0ebd..2404a838b1fe 100644
--- a/drivers/net/pcmcia/3c574_cs.c
+++ b/drivers/net/pcmcia/3c574_cs.c
@@ -1035,7 +1035,8 @@ static int el3_rx(struct net_device *dev, int worklimit)
 	DEBUG(3, "%s: in rx_packet(), status %4.4x, rx_status %4.4x.\n",
 		  dev->name, inw(ioaddr+EL3_STATUS), inw(ioaddr+RxStatus));
 	while (!((rx_status = inw(ioaddr + RxStatus)) & 0x8000) &&
-		   (--worklimit >= 0)) {
+			worklimit > 0) {
+		worklimit--;
 		if (rx_status & 0x4000) { /* Error, update stats. */
 			short error = rx_status & 0x3800;
 			dev->stats.rx_errors++;
diff --git a/drivers/net/pcmcia/3c589_cs.c b/drivers/net/pcmcia/3c589_cs.c
index 73ecc657999d..1e01b8a6dbf3 100644
--- a/drivers/net/pcmcia/3c589_cs.c
+++ b/drivers/net/pcmcia/3c589_cs.c
@@ -857,7 +857,8 @@ static int el3_rx(struct net_device *dev)
     DEBUG(3, "%s: in rx_packet(), status %4.4x, rx_status %4.4x.\n",
 	  dev->name, inw(ioaddr+EL3_STATUS), inw(ioaddr+RX_STATUS));
     while (!((rx_status = inw(ioaddr + RX_STATUS)) & 0x8000) &&
-	   (--worklimit >= 0)) {
+		    worklimit > 0) {
+	worklimit--;
 	if (rx_status & 0x4000) { /* Error, update stats. */
 	    short error = rx_status & 0x3800;
 	    dev->stats.rx_errors++;