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| author | Denis V. Lunev <den@openvz.org> | 2008-05-21 02:12:44 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-05-21 02:12:44 +0400 |
| commit | d3ede327e83f202c3a0962e207318f65717c5eb7 (patch) | |
| tree | 2875979c06b127edc325bf77518837c28477ebd5 /net/core | |
| parent | 5fb13570543f4ae022996c9d7c0c099c8abf22dd (diff) | |
| download | linux-d3ede327e83f202c3a0962e207318f65717c5eb7.tar.xz | |
pktgen: make sure that pktgen_thread_worker has been executed
The following courruption can happen during pktgen stop:
list_del corruption. prev->next should be ffff81007e8a5e70, but was 6b6b6b6b6b6b6b6b
kernel BUG at lib/list_debug.c:67!
:pktgen:pktgen_thread_worker+0x374/0x10b0
? autoremove_wake_function+0x0/0x40
? _spin_unlock_irqrestore+0x42/0x80
? :pktgen:pktgen_thread_worker+0x0/0x10b0
kthread+0x4d/0x80
child_rip+0xa/0x12
? restore_args+0x0/0x30
? kthread+0x0/0x80
? child_rip+0x0/0x12
RIP list_del+0x48/0x70
The problem is that pktgen_thread_worker can not be executed if kthread_stop
has been called too early. Insert a completion on the normal initialization
path to make sure that pktgen_thread_worker will gain the control for sure.
Signed-off-by: Denis V. Lunev <den@openvz.org>
Acked-by: Alexey Dobriyan <adobriyan@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/pktgen.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/net/core/pktgen.c b/net/core/pktgen.c index 8dca21110493..fdf537707e51 100644 --- a/net/core/pktgen.c +++ b/net/core/pktgen.c @@ -390,6 +390,7 @@ struct pktgen_thread { int cpu; wait_queue_head_t queue; + struct completion start_done; }; #define REMOVE 1 @@ -3414,6 +3415,7 @@ static int pktgen_thread_worker(void *arg) BUG_ON(smp_processor_id() != cpu); init_waitqueue_head(&t->queue); + complete(&t->start_done); pr_debug("pktgen: starting pktgen/%d: pid=%d\n", cpu, task_pid_nr(current)); @@ -3615,6 +3617,7 @@ static int __init pktgen_create_thread(int cpu) INIT_LIST_HEAD(&t->if_list); list_add_tail(&t->th_list, &pktgen_threads); + init_completion(&t->start_done); p = kthread_create(pktgen_thread_worker, t, "kpktgend_%d", cpu); if (IS_ERR(p)) { @@ -3639,6 +3642,7 @@ static int __init pktgen_create_thread(int cpu) } wake_up_process(p); + wait_for_completion(&t->start_done); return 0; } |