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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2012-05-09 13:29:51 +0000 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2012-05-20 22:56:53 +0100 |
| commit | 03f3b8447061afb212e374e274b0b799c0776e3f (patch) | |
| tree | 6a66ecce8b820585746b7c7786ed2aac115206e2 | |
| parent | 7338d50a12ca0b3af8460896c6aa554a33a731b8 (diff) | |
| download | linux-stable-03f3b8447061afb212e374e274b0b799c0776e3f.tar.gz linux-stable-03f3b8447061afb212e374e274b0b799c0776e3f.tar.bz2 linux-stable-03f3b8447061afb212e374e274b0b799c0776e3f.zip | |
pktgen: fix crash at module unload
commit c57b54684060c8aced64a5b78ff69ff289af97b9 upstream.
commit 7d3d43dab4e9 (net: In unregister_netdevice_notifier unregister
the netdevices.) makes pktgen crashing at module unload.
[ 296.820578] BUG: spinlock bad magic on CPU#6, rmmod/3267
[ 296.820719] lock: ffff880310c38000, .magic: ffff8803, .owner: <none>/-1, .owner_cpu: -1
[ 296.820943] Pid: 3267, comm: rmmod Not tainted 3.4.0-rc5+ #254
[ 296.821079] Call Trace:
[ 296.821211] [<ffffffff8168a715>] spin_dump+0x8a/0x8f
[ 296.821345] [<ffffffff8168a73b>] spin_bug+0x21/0x26
[ 296.821507] [<ffffffff812b4741>] do_raw_spin_lock+0x131/0x140
[ 296.821648] [<ffffffff8169188e>] _raw_spin_lock+0x1e/0x20
[ 296.821786] [<ffffffffa00cc0fd>] __pktgen_NN_threads+0x4d/0x140 [pktgen]
[ 296.821928] [<ffffffffa00ccf8d>] pktgen_device_event+0x10d/0x1e0 [pktgen]
[ 296.822073] [<ffffffff8154ed4f>] unregister_netdevice_notifier+0x7f/0x100
[ 296.822216] [<ffffffffa00d2a0b>] pg_cleanup+0x48/0x73 [pktgen]
[ 296.822357] [<ffffffff8109528e>] sys_delete_module+0x17e/0x2a0
[ 296.822502] [<ffffffff81699652>] system_call_fastpath+0x16/0x1b
Hold the pktgen_thread_lock while splicing pktgen_threads, and test
pktgen_exiting in pktgen_device_event() to make unload faster.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
| -rw-r--r-- | net/core/pktgen.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/net/core/pktgen.c b/net/core/pktgen.c index 0001c243b35c..657e5f919754 100644 --- a/net/core/pktgen.c +++ b/net/core/pktgen.c @@ -1932,7 +1932,7 @@ static int pktgen_device_event(struct notifier_block *unused, { struct net_device *dev = ptr; - if (!net_eq(dev_net(dev), &init_net)) + if (!net_eq(dev_net(dev), &init_net) || pktgen_exiting) return NOTIFY_DONE; /* It is OK that we do not hold the group lock right now, @@ -3758,12 +3758,18 @@ static void __exit pg_cleanup(void) { struct pktgen_thread *t; struct list_head *q, *n; + struct list_head list; /* Stop all interfaces & threads */ pktgen_exiting = true; - list_for_each_safe(q, n, &pktgen_threads) { + mutex_lock(&pktgen_thread_lock); + list_splice(&list, &pktgen_threads); + mutex_unlock(&pktgen_thread_lock); + + list_for_each_safe(q, n, &list) { t = list_entry(q, struct pktgen_thread, th_list); + list_del(&t->th_list); kthread_stop(t->tsk); kfree(t); } |