From: Ursula Braun <braunu@xxxxxxxxxx> Linux may hang when running af_iucv socket programs concurrently with a load of module netiucv. iucv_register() tries to take the iucv_table_lock with spin_lock_irq. This conflicts with iucv_connect() which has a need for an smp_call_function while holding the iucv_table_lock. Solution: use bh-disabling locking in iucv_register() Signed-off-by: Ursula Braun <braunu@xxxxxxxxxx> --- net/iucv/iucv.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff -urpN linux-2.6/net/iucv/iucv.c linux-2.6-patched/net/iucv/iucv.c --- linux-2.6/net/iucv/iucv.c 2008-02-07 13:24:12.000000000 +0100 +++ linux-2.6-patched/net/iucv/iucv.c 2008-02-07 13:24:34.000000000 +0100 @@ -693,9 +693,9 @@ int iucv_register(struct iucv_handler *h iucv_setmask_up(); INIT_LIST_HEAD(&handler->paths); - spin_lock_irq(&iucv_table_lock); + spin_lock_bh(&iucv_table_lock); list_add_tail(&handler->list, &iucv_handler_list); - spin_unlock_irq(&iucv_table_lock); + spin_unlock_bh(&iucv_table_lock); rc = 0; out_mutex: mutex_unlock(&iucv_register_mutex); -- - To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
