[ATM]: deregistration removes device from atm_devs list immediately
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>
diff --git a/net/atm/common.c b/net/atm/common.c
index 9e016f4..6656b11 100644
--- a/net/atm/common.c
+++ b/net/atm/common.c
@@ -221,6 +221,29 @@
EXPORT_SYMBOL(vcc_release_async);
+void atm_dev_release_vccs(struct atm_dev *dev)
+{
+ int i;
+
+ write_lock_irq(&vcc_sklist_lock);
+ for (i = 0; i < VCC_HTABLE_SIZE; i++) {
+ struct hlist_head *head = &vcc_hash[i];
+ struct hlist_node *node, *tmp;
+ struct sock *s;
+ struct atm_vcc *vcc;
+
+ sk_for_each_safe(s, node, tmp, head) {
+ vcc = atm_sk(s);
+ if (vcc->dev == dev) {
+ vcc_release_async(vcc, -EPIPE);
+ sk_del_node_init(s);
+ }
+ }
+ }
+ write_unlock_irq(&vcc_sklist_lock);
+}
+
+
static int adjust_tp(struct atm_trafprm *tp,unsigned char aal)
{
int max_sdu;
@@ -332,12 +355,13 @@
return -EINVAL;
if (vci > 0 && vci < ATM_NOT_RSV_VCI && !capable(CAP_NET_BIND_SERVICE))
return -EPERM;
- error = 0;
+ error = -ENODEV;
if (!try_module_get(dev->ops->owner))
- return -ENODEV;
+ return error;
vcc->dev = dev;
write_lock_irq(&vcc_sklist_lock);
- if ((error = find_ci(vcc, &vpi, &vci))) {
+ if (test_bit(ATM_DF_REMOVED, &dev->flags) ||
+ (error = find_ci(vcc, &vpi, &vci))) {
write_unlock_irq(&vcc_sklist_lock);
goto fail_module_put;
}
diff --git a/net/atm/common.h b/net/atm/common.h
index e49ed41c..4887c31 100644
--- a/net/atm/common.h
+++ b/net/atm/common.h
@@ -47,4 +47,6 @@
/* SVC */
int svc_change_qos(struct atm_vcc *vcc,struct atm_qos *qos);
+void atm_dev_release_vccs(struct atm_dev *dev);
+
#endif
diff --git a/net/atm/resources.c b/net/atm/resources.c
index ad533b0..c8c459f 100644
--- a/net/atm/resources.c
+++ b/net/atm/resources.c
@@ -70,6 +70,7 @@
return dev;
}
+
struct atm_dev *atm_dev_register(const char *type, const struct atmdev_ops *ops,
int number, unsigned long *flags)
{
@@ -123,37 +124,22 @@
void atm_dev_deregister(struct atm_dev *dev)
{
- unsigned long warning_time;
+ BUG_ON(test_bit(ATM_DF_REMOVED, &dev->flags));
+ set_bit(ATM_DF_REMOVED, &dev->flags);
- atm_proc_dev_deregister(dev);
-
+ /*
+ * if we remove current device from atm_devs list, new device
+ * with same number can appear, such we need deregister proc,
+ * release async all vccs and remove them from vccs list too
+ */
down(&atm_dev_mutex);
list_del(&dev->dev_list);
up(&atm_dev_mutex);
- warning_time = jiffies;
- while (atomic_read(&dev->refcnt) != 1) {
- msleep(250);
- if ((jiffies - warning_time) > 10 * HZ) {
- printk(KERN_EMERG "atm_dev_deregister: waiting for "
- "dev %d to become free. Usage count = %d\n",
- dev->number, atomic_read(&dev->refcnt));
- warning_time = jiffies;
- }
- }
+ atm_dev_release_vccs(dev);
+ atm_proc_dev_deregister(dev);
- kfree(dev);
-}
-
-void shutdown_atm_dev(struct atm_dev *dev)
-{
- if (atomic_read(&dev->refcnt) > 1) {
- set_bit(ATM_DF_CLOSE, &dev->flags);
- return;
- }
- if (dev->ops->dev_close)
- dev->ops->dev_close(dev);
- atm_dev_deregister(dev);
+ atm_dev_put(dev);
}
@@ -433,4 +419,3 @@
EXPORT_SYMBOL(atm_dev_register);
EXPORT_SYMBOL(atm_dev_deregister);
EXPORT_SYMBOL(atm_dev_lookup);
-EXPORT_SYMBOL(shutdown_atm_dev);