Messages in this thread Patches in this message | | | Subject | Re: 2.6.7-rc3: waiting for eth0 to become free | From | Felipe Alfaro Solana <> | Date | Wed, 09 Jun 2004 17:18:02 +0200 |
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On Tue, 2004-06-08 at 14:02 -0700, Stephen Hemminger wrote: > On Tue, 08 Jun 2004 22:09:29 +0200 > Felipe Alfaro Solana <felipe_alfaro@linuxmail.org> wrote: > > > On Tue, 2004-06-08 at 12:42 -0700, Stephen Hemminger wrote: > > > On Tue, 08 Jun 2004 21:18:30 +0200 > > > Felipe Alfaro Solana <felipe_alfaro@linuxmail.org> wrote: > > > > > > > Hi! > > > > > > > > On my laptop, when using a CardBus 3c59x-based NIC, I need to run > > > > "cardctl eject" so the system won't freeze when resuming. "cardctl > > > > eject" worked fine in 2.6.7-rc2-mm2, even when there were programs with > > > > network sockets opened (for example, Evolution mantaining a connection > > > > against an IMAP server): the card is ejected (well, not physically), > > > > even when there are ESTABLISHED connections. > > > > > > > > However, starting with 2.6.7-rc3, "cardctl eject" hangs if a program > > > > holds any socket open. After a while the "unregister_netdevice: waiting > > > > for eth0 to become free" message starts appearing on the kernel message > > > > ring. The only apparent solution is killing that program, ejecting the > > > > card from its slot and wait until 3c59x.o usage count reaches zero. > > > > > > > > Can someone tell me what's going on here? > > > > Thank you very much. > > > > > > What protocols are you running? Is IPV6 loaded? > > > > I'm using IPv4, IPv6 and IPSec ESP with AES/CBC. > > Do you want .config? > > Not really, could you see if it is an IPv6 vs IPSec problem by not running/loading > one or the other. > > What is happening is that some subsystem is holding a reference to the device (calling dev_hold()) > but not cleaning up (calling dev_put). It can be a hard to track which of the many > things routing, etc are not being cleared properly. Look for routes that still > get stuck (ip route) and neighbor cache entries. Most of these end up being > protocol bugs.
The two attached patches, one for net/ipv4/route.c, the other for net/ ipv6/route.c fix all my problems when running "cardctl eject" while a program mantains an open network socket (ESTABLISHED).
Both patches apply cleanly against 2.6.7-rc3 and 2.6.7-rc3-mm1. I'm not completely sure what has changed in 2.6.7-rc3 that is breaking cardctl for me, as it Just Worked(TM) fine in 2.6.7-rc2.
Hope this can throw some light at this issue. Thanks!
--- linux/net/ipv4/route.c 2004-06-09 16:10:40.612487739 +0200 +++ linux/net/ipv4/route.c 2004-06-09 16:47:34.927939813 +0200 @@ -1040,8 +1040,6 @@ rt->u.dst.child = NULL; if (rt->u.dst.dev) dev_hold(rt->u.dst.dev); - if (rt->idev) - in_dev_hold(rt->idev); rt->u.dst.obsolete = 0; rt->u.dst.lastuse = jiffies; rt->u.dst.path = &rt->u.dst; @@ -1496,7 +1494,6 @@ rth->fl.iif = dev->ifindex; rth->u.dst.dev = &loopback_dev; dev_hold(rth->u.dst.dev); - rth->idev = in_dev_get(rth->u.dst.dev); rth->fl.oif = 0; rth->rt_gateway = daddr; rth->rt_spec_dst= spec_dst; @@ -1706,7 +1703,6 @@ rth->fl.iif = dev->ifindex; rth->u.dst.dev = out_dev->dev; dev_hold(rth->u.dst.dev); - rth->idev = in_dev_get(rth->u.dst.dev); rth->fl.oif = 0; rth->rt_spec_dst= spec_dst; @@ -1786,7 +1782,6 @@ rth->fl.iif = dev->ifindex; rth->u.dst.dev = &loopback_dev; dev_hold(rth->u.dst.dev); - rth->idev = in_dev_get(rth->u.dst.dev); rth->rt_gateway = daddr; rth->rt_spec_dst= spec_dst; rth->u.dst.input= ip_local_deliver; @@ -2170,7 +2165,6 @@ rth->rt_iif = oldflp->oif ? : dev_out->ifindex; rth->u.dst.dev = dev_out; dev_hold(dev_out); - rth->idev = in_dev_get(dev_out); rth->rt_gateway = fl.fl4_dst; rth->rt_spec_dst= fl.fl4_src; --- linux/net/ipv6/route.c 2004-06-09 15:10:03.000000000 +0200 +++ linux/net/ipv6/route.c 2004-06-09 16:52:51.219867318 +0200 @@ -584,14 +584,14 @@ if (unlikely(rt == NULL)) goto out; - dev_hold(dev); + if(dev) + dev_hold(dev); if (neigh) neigh_hold(neigh); else neigh = ndisc_get_neigh(dev, addr); rt->rt6i_dev = dev; - rt->rt6i_idev = in6_dev_get(dev); rt->rt6i_nexthop = neigh; rt->rt6i_expires = 0; rt->rt6i_flags = RTF_LOCAL; @@ -882,7 +882,6 @@ if (!rt->u.dst.metrics[RTAX_ADVMSS-1]) rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_pmtu(&rt->u.dst)); rt->u.dst.dev = dev; - rt->rt6i_idev = in6_dev_get(dev); return rt6_ins(rt, nlh, _rtattr); out: @@ -1301,7 +1300,6 @@ rt->u.dst.input = ip6_input; rt->u.dst.output = ip6_output; rt->rt6i_dev = &loopback_dev; - rt->rt6i_idev = in6_dev_get(&loopback_dev); rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_pmtu(&rt->u.dst)); rt->u.dst.metrics[RTAX_HOPLIMIT-1] = ipv6_get_hoplimit(rt->rt6i_dev); | |