SONIC interrupt handling

Install the built-in macsonic interrupt handler on both IRQs when using
via_alt_mapping. Otherwise the rare interrupt that still comes from the
nubus slot will wedge the nubus.

$ cat /proc/interrupts
auto 2: 89176 via2
auto 3: 744367 sonic
auto 4: 0 scc
auto 6: 318363 via1
auto 7: 0 NMI
mac 9: 119413 framebuffer vbl
mac 10: 1971 ADB
mac 14: 198517 timer
mac 17: 89104 nubus
mac 19: 72 Mac ESP SCSI
mac 56: 629 sonic
mac 62: 1142593 ide0

Version 1 of this patch had a bug where a nubus sonic card would register
two interrupt handlers. Only a built-in sonic needs both.

Versions 2 and 3 needed some cleanups, as Raylynn Knight and Christoph
Hellwig pointed out (thanks).

Signed-off-by: Finn Thain <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/net/jazzsonic.c

···
 	0xffff			/* end of list */
 };
 
+static int jazzsonic_open(struct net_device* dev)
+{
+	if (request_irq(dev->irq, &sonic_interrupt, IRQF_DISABLED, "sonic", dev)) {
+		printk(KERN_ERR "%s: unable to get IRQ %d.\n", dev->name, dev->irq);
+		return -EAGAIN;
+	}
+	return sonic_open(dev);
+}
+
+static int jazzsonic_close(struct net_device* dev)
+{
+	int err;
+	err = sonic_close(dev);
+	free_irq(dev->irq, dev);
+	return err;
+}
+
 static int __init sonic_probe1(struct net_device *dev)
 {
 	static unsigned version_printed;
···
 	lp->rra_laddr = lp->rda_laddr + (SIZEOF_SONIC_RD * SONIC_NUM_RDS
 	                     * SONIC_BUS_SCALE(lp->dma_bitmode));
 
-	dev->open = sonic_open;
-	dev->stop = sonic_close;
+	dev->open = jazzsonic_open;
+	dev->stop = jazzsonic_close;
 	dev->hard_start_xmit = sonic_send_packet;
 	dev->get_stats = sonic_get_stats;
 	dev->set_multicast_list = &sonic_multicast_list;
···
 MODULE_DESCRIPTION("Jazz SONIC ethernet driver");
 module_param(sonic_debug, int, 0);
 MODULE_PARM_DESC(sonic_debug, "jazzsonic debug level (1-4)");
-
-#define SONIC_IRQ_FLAG IRQF_DISABLED
 
 #include "sonic.c"
 

drivers/net/macsonic.c

···
 		addr[i] = bitrev8(addr[i]);
 }
 
+static irqreturn_t macsonic_interrupt(int irq, void *dev_id)
+{
+	irqreturn_t result;
+	unsigned long flags;
+
+	local_irq_save(flags);
+	result = sonic_interrupt(irq, dev_id);
+	local_irq_restore(flags);
+	return result;
+}
+
+static int macsonic_open(struct net_device* dev)
+{
+	if (request_irq(dev->irq, &sonic_interrupt, IRQ_FLG_FAST, "sonic", dev)) {
+		printk(KERN_ERR "%s: unable to get IRQ %d.\n", dev->name, dev->irq);
+		return -EAGAIN;
+	}
+	/* Under the A/UX interrupt scheme, the onboard SONIC interrupt comes
+	 * in at priority level 3. However, we sometimes get the level 2 inter-
+	 * rupt as well, which must prevent re-entrance of the sonic handler.
+	 */
+	if (dev->irq == IRQ_AUTO_3)
+		if (request_irq(IRQ_NUBUS_9, &macsonic_interrupt, IRQ_FLG_FAST, "sonic", dev)) {
+			printk(KERN_ERR "%s: unable to get IRQ %d.\n", dev->name, IRQ_NUBUS_9);
+			free_irq(dev->irq, dev);
+			return -EAGAIN;
+		}
+	return sonic_open(dev);
+}
+
+static int macsonic_close(struct net_device* dev)
+{
+	int err;
+	err = sonic_close(dev);
+	free_irq(dev->irq, dev);
+	if (dev->irq == IRQ_AUTO_3)
+		free_irq(IRQ_NUBUS_9, dev);
+	return err;
+}
+
 int __init macsonic_init(struct net_device* dev)
 {
 	struct sonic_local* lp = netdev_priv(dev);
···
 	lp->rra_laddr = lp->rda_laddr + (SIZEOF_SONIC_RD * SONIC_NUM_RDS
 	                     * SONIC_BUS_SCALE(lp->dma_bitmode));
 
-	dev->open = sonic_open;
-	dev->stop = sonic_close;
+	dev->open = macsonic_open;
+	dev->stop = macsonic_close;
 	dev->hard_start_xmit = sonic_send_packet;
 	dev->get_stats = sonic_get_stats;
 	dev->set_multicast_list = &sonic_multicast_list;
···
 MODULE_DESCRIPTION("Macintosh SONIC ethernet driver");
 module_param(sonic_debug, int, 0);
 MODULE_PARM_DESC(sonic_debug, "macsonic debug level (1-4)");
-
-#define SONIC_IRQ_FLAG IRQ_FLG_FAST
 
 #include "sonic.c"
 

drivers/net/sonic.c

···
 	if (sonic_debug > 2)
 		printk("sonic_open: initializing sonic driver.\n");
 
-	/*
-	 * We don't need to deal with auto-irq stuff since we
-	 * hardwire the sonic interrupt.
-	 */
-/*
- * XXX Horrible work around:  We install sonic_interrupt as fast interrupt.
- * This means that during execution of the handler interrupt are disabled
- * covering another bug otherwise corrupting data.  This doesn't mean
- * this glue works ok under all situations.
- *
- * Note (dhd): this also appears to prevent lockups on the Macintrash
- * when more than one Ethernet card is installed (knock on wood)
- *
- * Note (fthain): whether the above is still true is anyones guess. Certainly
- * the buffer handling algorithms will not tolerate re-entrance without some
- * mutual exclusion added. Anyway, the memcpy has now been eliminated from the
- * rx code to make this a faster "fast interrupt".
- */
-	if (request_irq(dev->irq, &sonic_interrupt, SONIC_IRQ_FLAG, "sonic", dev)) {
-		printk(KERN_ERR "\n%s: unable to get IRQ %d .\n", dev->name, dev->irq);
-		return -EAGAIN;
-	}
-
 	for (i = 0; i < SONIC_NUM_RRS; i++) {
 		struct sk_buff *skb = dev_alloc_skb(SONIC_RBSIZE + 2);
 		if (skb == NULL) {
···
 			lp->rx_skb[i] = NULL;
 		}
 	}
-
-	free_irq(dev->irq, dev);	/* release the IRQ */
 
 	return 0;
 }