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[ATM]: deregistration removes device from atm_devs list immediately

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atm_dev_deregister() removes device from atm_dev list immediately to
prevent operations on a phantom device.  Decision to free device based
only on ->refcnt  now. Remove shutdown_atm_dev() use atm_dev_deregister()
instead.  atm_dev_deregister() also asynchronously releases all vccs
related to device.

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 16:16:41 -08:00 • committed by David S. Miller
parent aaaaaadbe7
commit 64bf69ddff
6 changed files with 51 additions and 56 deletions
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14
include/linux/atmdev.h
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@ -274,7 +274,7 @@ enum {
enum {
ATM_DF_CLOSE, /* close device when last VCC is closed */
ATM_DF_REMOVED, /* device was removed from atm_devs list */
};
@ -415,7 +415,6 @@ struct atm_dev *atm_dev_register(const char *type,const struct atmdev_ops *ops,
int number,unsigned long *flags); /* number == -1: pick first available */
struct atm_dev *atm_dev_lookup(int number);
void atm_dev_deregister(struct atm_dev *dev);
void shutdown_atm_dev(struct atm_dev *dev);
void vcc_insert_socket(struct sock *sk);
@ -457,11 +456,12 @@ static inline void atm_dev_hold(struct atm_dev *dev)
static inline void atm_dev_put(struct atm_dev *dev)
{
atomic_dec(&dev->refcnt);
if ((atomic_read(&dev->refcnt) == 1) &&
test_bit(ATM_DF_CLOSE,&dev->flags))
shutdown_atm_dev(dev);
if (atomic_dec_and_test(&dev->refcnt)) {
BUG_ON(!test_bit(ATM_DF_REMOVED, &dev->flags));
if (dev->ops->dev_close)
dev->ops->dev_close(dev);
kfree(dev);
}
}