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SubjectRe: PROBLEM: 2.6.11-rc2 hangs on bridge shutdown (br0)
From
On Sat, Feb 05, 2005 at 08:10:44PM -0800, David S. Miller wrote:
>
> > Alternatively we can
> > remove the dst->dev == dev check in dst_dev_event and dst_ifdown
> > and move that test down to the individual ifdown functions.
>
> I think there is a hole in this idea.... maybe.
>
> If the idea is to scan dst_garbage_list down in ipv6 specific code,
> you can't do that since 'dst' objects from every pool in the kernel
> get put onto the dst_garbage_list. It is generic.

The idea is to move the check into dst->ops->ifdown. By definition
ipv6_dst_ifdown will only see rt6_info entries. So dst_dev_event
will become

for (dst = dst_garbage_list; dst; dst = dst->next) {
dst_ifdown(dst, event != NETDEV_DOWN);
}
dst_ifdown will become

...

do {
if (dst->dev == dev && unregister) {
...
}
dst->ops->ifdown(dst, dev, unregister);
} while ((dst = dst->child) && dst->flags & DST_NOHASH);
...

Note the extra dev argument to ifdown. ipv6_dst_ifdown will be

static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
int how)
{
struct rt6_info *rt = (struct rt6_info *)dst;
struct inet6_dev *idev = rt->rt6i_idev;
if (idev != NULL && idev->dev != &loopback_dev && idev->dev == dev) {
struct inet6_dev *loopback_idev = in6_dev_get(&loopback_dev);
if (loopback_idev != NULL) {
rt->rt6i_idev = loopback_idev;
in6_dev_put(idev);
}
}
}
Cheers,
--
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