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[IUCV]: wrong irq-disabling locking at module load time 

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@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ursula Braun 2008-02-07 18:06:52 -08:00 committed by David S. Miller
parent a219994bf5
commit 435bc9dfc6
1 changed files with 2 additions and 2 deletions
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4
net/iucv/iucv.c
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@ -693,9 +693,9 @@ int iucv_register(struct iucv_handler *handler, int smp)
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);