Maybe you guys can spot something I'm missing here. alloc_netdev is
supposed to guarantee that dev->priv is aligned by 32 bytes:
struct net_device *alloc_netdev(int sizeof_priv, const char *mask,
void (*setup)(struct net_device *))
struct net_device *dev;
/* ensure 32-byte alignment of the private area */
alloc_size = sizeof (*dev) + sizeof_priv + 31;
dev = (struct net_device *) kmalloc (alloc_size, GFP_KERNEL);
if (dev == NULL)
printk(KERN_ERR "alloc_dev: Unable to allocate device
memset(dev, 0, alloc_size);
dev->priv = (void *) (((long)(dev + 1) + 31) & ~31);
Now... shouldn't that last line of code be "dev + 1 + sizeof(*dev)" ?
It seems to work 2. for a long time, so I am doubting myself...
surely it would have caused memory corruption or something by now if I
have really found a bug.