Subject: [PATCH] netconsole support for b44

From: Con Kolivas <[email-masked]>
Date: Tue, 12 Oct 2004 21:39:23 +1000

This patch adds poll support to the b44 driver to allow netconsole 
support. Style lifted straight from 8139too.c

here is the dmesg output with it in place:

netconsole: device eth0 not up yet, forcing it
netconsole: carrier detect appears flaky, waiting 10 seconds
b44: eth0: Link is down.
b44: eth0: Link is up at 100 Mbps, full duplex.
b44: eth0: Flow control is on for TX and on for RX.
netconsole: network logging started

output confirmed by netcat on other system.

Signed-off-by: Con Kolivas <[email-masked]>
Index: linux-2.6.9-rc4-ck1/drivers/net/b44.c
===================================================================
--- linux-2.6.9-rc4-ck1.orig/drivers/net/b44.c	2004-10-11 16:15:59.000000000 +1000
+++ linux-2.6.9-rc4-ck1/drivers/net/b44.c	2004-10-12 21:18:39.492813689 +1000
@@ -97,6 +97,10 @@ MODULE_DEVICE_TABLE(pci, b44_pci_tbl);
 static void b44_halt(struct b44 *);
 static void b44_init_rings(struct b44 *);
 static void b44_init_hw(struct b44 *);
+static int b44_poll(struct net_device *dev, int *budget);
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void b44_poll_controller(struct net_device *dev);
+#endif
 
 static inline unsigned long br32(const struct b44 *bp, unsigned long reg)
 {
@@ -1297,6 +1301,19 @@ err_out_free:
 }
 #endif
 
+#ifdef CONFIG_NET_POLL_CONTROLLER
+/*
+ * Polling receive - used by netconsole and other diagnostic tools
+ * to allow network i/o with interrupts disabled.
+ */
+static void b44_poll_controller(struct net_device *dev)
+{
+	disable_irq(dev->irq);
+	b44_interrupt (dev->irq, dev, NULL);
+	enable_irq(dev->irq);
+}
+#endif
+
 static int b44_close(struct net_device *dev)
 {
 	struct b44 *bp = netdev_priv(dev);
@@ -1793,6 +1810,9 @@ static int __devinit b44_init_one(struct
 	dev->poll = b44_poll;
 	dev->weight = 64;
 	dev->watchdog_timeo = B44_TX_TIMEOUT;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	dev->poll_controller = b44_poll_controller;
+#endif
 	dev->change_mtu = b44_change_mtu;
 	dev->irq = pdev->irq;
 	SET_ETHTOOL_OPS(dev, &b44_ethtool_ops);