Re: [PATCH 475] HP300 LANCE

[Christoph Hellwig <hch@infradead.org>]

On Sun, Oct 31, 2004 at 11:03:30AM +0100, Geert Uytterhoeven wrote:
> HP300 LANCE updates from Kars de Jong:
>   - Updated HP LANCE driver to use the new DIO semantics
>   - If only HP LANCE or MVME147 LANCE is selected, enable compile-time
>     choice of LANCE register access. If both are defined, go through the
>     function pointer
>   - Added support for CONFIG_NET_POLL_CONTROLLER
>   - Fixed problem with disabling board interrupts in hplance_close() which
>     caused the driver to lock up

There's tons of leaks in the hplcance probing code, and it doesn't release
he memory region on removal either.

Untested patch to fix those issues below:

--- 1.12/drivers/net/hplance.c	2004-10-06 22:44:40 +02:00
+++ edited/drivers/net/hplance.c	2004-11-01 10:20:17 +01:00
@@ -71,30 +71,42 @@
 	.remove    = __devexit_p(hplance_remove_one),
 };
 
+/* XXX(hch): should probably move to a better place */
+#define dio_resource_start(d) \
+	((d)->resource.start)
+#define dio_resource_len(d) \
+	((d)->resource.end - (d)->resource.start)
+
 /* Find all the HP Lance boards and initialise them... */
 static int __devinit hplance_init_one(struct dio_dev *d,
 				const struct dio_device_id *ent)
 {
 	struct net_device *dev;
-	int err;
+	int err = -ENOMEM;
 
 	dev = alloc_etherdev(sizeof(struct hplance_private));
 	if (!dev)
-		return -ENOMEM;
+		goto out;
 
-	if (!request_mem_region(d->resource.start, d->resource.end-d->resource.start, d->name))
-		return -EBUSY;
+	err = -EBUSY;
+	if (!request_mem_region(dio_resource_start(d),
+				dio_resource_len(d), d->name))
+		goto out_free_netdev;
 
-	SET_MODULE_OWNER(dev);
-        
 	hplance_init(dev, d);
 	err = register_netdev(dev);
-	if (err) {
-		free_netdev(dev);
-		return err;
-	}
+	if (err)
+		goto out_free_netdev;
+
 	dio_set_drvdata(d, dev);
 	return 0;
+
+ out_release_mem_region:
+	release_mem_region(dio_resource_start(d), dio_resource_len(d));
+ out_free_netdev:
+	free_netdev(dev);
+ out:
+	return err;
 }
 
 static void __devexit hplance_remove_one(struct dio_dev *d)
@@ -102,6 +114,7 @@
 	struct net_device *dev = dio_get_drvdata(d);
 
 	unregister_netdev(dev);
+	release_mem_region(dio_resource_start(d), dio_resource_len(d));
 	free_netdev(dev);
 }