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[ATM]: avoid race conditions related to atm_devs list

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Use semaphore to protect atm_devs list, as no one need access to it from
interrupt context.  Avoid race conditions between atm_dev_register(),
atm_dev_lookup() and atm_dev_deregister().  Fix double spin_unlock() bug.

Signed-off-by: Stanislaw Gruszka <stf_xl@wp.pl>
Signed-off-by: Chas Williams <chas@cmf.nrl.navy.mil>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stanislaw Gruszka
2005-11-29 16:16:21 -08:00
committed by David S. Miller
parent 4969328026
commit aaaaaadbe7
3 changed files with 20 additions and 23 deletions
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4
net/atm/common.c
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@@ -427,12 +427,12 @@ int vcc_connect(struct socket *sock, int itf, short vpi, int vci)
dev = try_then_request_module(atm_dev_lookup(itf), "atm-device-%d", itf);
} else {
dev = NULL;
spin_lock(&atm_dev_lock);
down(&atm_dev_mutex);
if (!list_empty(&atm_devs)) {
dev = list_entry(atm_devs.next, struct atm_dev, dev_list);
atm_dev_hold(dev);
}
spin_unlock(&atm_dev_lock);
up(&atm_dev_mutex);
}
if (!dev)
return -ENODEV;