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RDS: Rewrite connection cleanup, fixing oops on rmmod

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This fixes a bug where a connection was unexpectedly
not on *any* list while being destroyed. It also
cleans up some code duplication and regularizes some
function names.

* Grab appropriate lock in conn_free() and explain in comment
* Ensure via locking that a conn is never not on either
  a dev's list or the nodev list
* Add rds_xx_remove_conn() to match rds_xx_add_conn()
* Make rds_xx_add_conn() return void
* Rename remove_{,nodev_}conns() to
  destroy_{,nodev_}conns() and unify their implementation
  in a helper function
* Document lock ordering as nodev conn_lock before
  dev_conn_lock

Reported-by: Yosef Etigin <yosefe@voltaire.com>
Signed-off-by: Andy Grover <andy.grover@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andy Grover
2009-04-01 08:20:19 +00:00
committed by David S. Miller
parent f1cffcbfcc
commit 745cbccac3
8 changed files with 119 additions and 95 deletions
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54
net/rds/iw_rdma.c
View File

@@ -196,7 +196,7 @@ int rds_iw_update_cm_id(struct rds_iw_device *rds_iwdev, struct rdma_cm_id *cm_i
return rds_iw_add_cm_id(rds_iwdev, cm_id);
}
int rds_iw_add_conn(struct rds_iw_device *rds_iwdev, struct rds_connection *conn)
void rds_iw_add_conn(struct rds_iw_device *rds_iwdev, struct rds_connection *conn)
{
struct rds_iw_connection *ic = conn->c_transport_data;
@@ -205,45 +205,45 @@ int rds_iw_add_conn(struct rds_iw_device *rds_iwdev, struct rds_connection *conn
BUG_ON(list_empty(&iw_nodev_conns));
BUG_ON(list_empty(&ic->iw_node));
list_del(&ic->iw_node);
spin_unlock_irq(&iw_nodev_conns_lock);
spin_lock_irq(&rds_iwdev->spinlock);
list_add_tail(&ic->iw_node, &rds_iwdev->conn_list);
spin_unlock_irq(&rds_iwdev->spinlock);
ic->rds_iwdev = rds_iwdev;
return 0;
}
void rds_iw_remove_nodev_conns(void)
{
struct rds_iw_connection *ic, *_ic;
LIST_HEAD(tmp_list);
/* avoid calling conn_destroy with irqs off */
spin_lock_irq(&iw_nodev_conns_lock);
list_splice(&iw_nodev_conns, &tmp_list);
INIT_LIST_HEAD(&iw_nodev_conns);
spin_unlock_irq(&iw_nodev_conns_lock);
list_for_each_entry_safe(ic, _ic, &tmp_list, iw_node) {
if (ic->conn->c_passive)
rds_conn_destroy(ic->conn->c_passive);
rds_conn_destroy(ic->conn);
}
ic->rds_iwdev = rds_iwdev;
}
void rds_iw_remove_conns(struct rds_iw_device *rds_iwdev)
void rds_iw_remove_conn(struct rds_iw_device *rds_iwdev, struct rds_connection *conn)
{
struct rds_iw_connection *ic = conn->c_transport_data;
/* place conn on nodev_conns_list */
spin_lock(&iw_nodev_conns_lock);
spin_lock_irq(&rds_iwdev->spinlock);
BUG_ON(list_empty(&ic->iw_node));
list_del(&ic->iw_node);
spin_unlock_irq(&rds_iwdev->spinlock);
list_add_tail(&ic->iw_node, &iw_nodev_conns);
spin_unlock(&iw_nodev_conns_lock);
rds_iw_remove_cm_id(ic->rds_iwdev, ic->i_cm_id);
ic->rds_iwdev = NULL;
}
void __rds_iw_destroy_conns(struct list_head *list, spinlock_t *list_lock)
{
struct rds_iw_connection *ic, *_ic;
LIST_HEAD(tmp_list);
/* avoid calling conn_destroy with irqs off */
spin_lock_irq(&rds_iwdev->spinlock);
list_splice(&rds_iwdev->conn_list, &tmp_list);
INIT_LIST_HEAD(&rds_iwdev->conn_list);
spin_unlock_irq(&rds_iwdev->spinlock);
spin_lock_irq(list_lock);
list_splice(list, &tmp_list);
INIT_LIST_HEAD(list);
spin_unlock_irq(list_lock);
list_for_each_entry_safe(ic, _ic, &tmp_list, iw_node) {
if (ic->conn->c_passive)