[PATCH 21/64] fcoe: move the host-list add/remove to keep out VN_Ports

Robert Love
2009-08-25T21:00:15Z

From: Chris Leech <christopher.leech@intel.com>

We only want the FCoE create and destroy routines to deal with top level
N_Ports, the VN_Ports are tracked on the vport list (see scsi_transport_fc).

Signed-off-by: Chris Leech <christopher.leech@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
---

drivers/scsi/fcoe/fcoe.c | 31 +++++++++++++++++++------------
1 files changed, 19 insertions(+), 12 deletions(-)

diff --git a/drivers/scsi/fcoe/fcoe.c b/drivers/scsi/fcoe/fcoe.c
index 43added..c9a0346 100644
--- a/drivers/scsi/fcoe/fcoe.c
+++ b/drivers/scsi/fcoe/fcoe.c
@@ -616,9 +616,6 @@ static void fcoe_if_destroy(struct fc_lport *lport)
/* Logout of the fabric */
fc_fabric_logoff(lport);

- /* Remove the instance from fcoe's list */
- fcoe_hostlist_remove(lport);
-
/* Cleanup the fc_lport */
fc_lport_destroy(lport);
fc_fcp_destroy(lport);
@@ -757,11 +754,13 @@ static struct fc_lport *fcoe_if_create(struct fcoe_interface *fcoe,

/*
* fcoe_em_alloc() and fcoe_hostlist_add() both
- * need to be atomic under fcoe_hostlist_lock
+ * need to be atomic with respect to other changes to the hostlist
* since fcoe_em_alloc() looks for an existing EM
* instance on host list updated by fcoe_hostlist_add().
+ *
+ * This is currently handled through the fcoe_config_mutex begin held.
*/
- write_lock(&fcoe_hostlist_lock);
+
/* lport exch manager allocation */
rc = fcoe_em_config(lport);
if (rc) {
@@ -770,10 +769,6 @@ static struct fc_lport *fcoe_if_create(struct fcoe_interface *fcoe,
goto out_lp_destroy;
}

- /* add to lports list */
- fcoe_hostlist_add(lport);
- write_unlock(&fcoe_hostlist_lock);
-
dev_hold(netdev);
fcoe_interface_get(fcoe);
return lport;
@@ -1713,6 +1708,8 @@ static int fcoe_destroy(const char *buffer, struct kernel_param *kp)
rc = -ENODEV;
goto out_putdev;
}
+ /* Remove the instance from fcoe's list */
+ fcoe_hostlist_remove(lport);
port = lport_priv(lport);
fcoe = port->fcoe;
fcoe_if_destroy(lport);
@@ -1782,6 +1779,9 @@ static int fcoe_create(const char *buffer, struct kernel_param *kp)
/* Make this the "master" N_Port */
fcoe->ctlr.lp = lport;

+ /* add to lports list */
+ fcoe_hostlist_add(lport);
+
/* start FIP Discovery and FLOGI */
lport->boot_time = jiffies;
fc_fabric_login(lport);
@@ -1954,8 +1954,6 @@ struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev)
* fcoe_hostlist_add() - Add a lport to lports list
* @lp: ptr to the fc_lport to be added
*
- * Called with write fcoe_hostlist_lock held.
- *
* Returns: 0 for success
*/
int fcoe_hostlist_add(const struct fc_lport *lport)
@@ -1963,12 +1961,14 @@ int fcoe_hostlist_add(const struct fc_lport *lport)
struct fcoe_interface *fcoe;
struct fcoe_port *port;

+ write_lock_bh(&fcoe_hostlist_lock);
fcoe = fcoe_hostlist_lookup_port(fcoe_netdev(lport));
if (!fcoe) {
port = lport_priv(lport);
fcoe = port->fcoe;
list_add_tail(&fcoe->list, &fcoe_hostlist);
}
+ write_unlock_bh(&fcoe_hostlist_lock);
return 0;
}

@@ -2045,14 +2045,21 @@ static void __exit fcoe_exit(void)
{
unsigned int cpu;
struct fcoe_interface *fcoe, *tmp;
+ LIST_HEAD(local_list);

mutex_lock(&fcoe_config_mutex);

fcoe_dev_cleanup();

/* releases the associated fcoe hosts */
- list_for_each_entry_safe(fcoe, tmp, &fcoe_hostlist, list)
+ write_lock_bh(&fcoe_hostlist_lock);
+ list_splice_init(&fcoe_hostlist, &local_list);
+ write_unlock_bh(&fcoe_hostlist_lock);
+
+ list_for_each_entry_safe(fcoe, tmp, &local_list, list) {
+ list_del(&fcoe->list);
fcoe_if_destroy(fcoe->ctlr.lp);
+ }

unregister_hotcpu_notifier(&fcoe_cpu_notifier);