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[SCSI] fcoe: use rtnl mutex in place of hostlist lock

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This just cuts down on the number of locks we're dealing with, and
eliminates the need to take another lock in the netdev notifier.

Signed-off-by: Chris Leech <christopher.leech@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Chris Leech 2009-08-25 14:00:28 -07:00 committed by James Bottomley
parent 2e70e24151
commit 090eb6c41a
1 changed files with 11 additions and 26 deletions
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37
drivers/scsi/fcoe/fcoe.c
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@ -58,8 +58,8 @@ MODULE_PARM_DESC(ddp_min, "Minimum I/O size in bytes for " \
DEFINE_MUTEX(fcoe_config_mutex);
/* fcoe host list */
/* must only by accessed under the RTNL mutex */
LIST_HEAD(fcoe_hostlist);
DEFINE_RWLOCK(fcoe_hostlist_lock);
DEFINE_PER_CPU(struct fcoe_percpu_s, fcoe_percpu);
/* Function Prototypes */
@ -527,8 +527,6 @@ bool fcoe_oem_match(struct fc_frame *fp)
* fcoe_em_config() - allocates em for this lport
* @lp: the fcoe that em is to allocated for
*
* Called with write fcoe_hostlist_lock held.
*
* Returns : 0 on success
*/
static inline int fcoe_em_config(struct fc_lport *lp)
@ -1539,7 +1537,6 @@ static int fcoe_device_notification(struct notifier_block *notifier,
u32 mfs;
int rc = NOTIFY_OK;
write_lock(&fcoe_hostlist_lock);
list_for_each_entry(fcoe, &fcoe_hostlist, list) {
if (fcoe->netdev == netdev) {
lp = fcoe->ctlr.lp;
@ -1586,7 +1583,6 @@ static int fcoe_device_notification(struct notifier_block *notifier,
fcoe_clean_pending_queue(lp);
}
out:
write_unlock(&fcoe_hostlist_lock);
return rc;
}
@ -1643,16 +1639,14 @@ static int fcoe_destroy(const char *buffer, struct kernel_param *kp)
goto out_nodev;
}
write_lock(&fcoe_hostlist_lock);
rtnl_lock();
fcoe = fcoe_hostlist_lookup_port(netdev);
if (!fcoe) {
write_unlock(&fcoe_hostlist_lock);
rtnl_unlock();
rc = -ENODEV;
goto out_putdev;
}
list_del(&fcoe->list);
write_unlock(&fcoe_hostlist_lock);
rtnl_lock();
fcoe_interface_cleanup(fcoe);
rtnl_unlock();
fcoe_if_destroy(fcoe->ctlr.lp);
@ -1870,9 +1864,8 @@ int fcoe_reset(struct Scsi_Host *shost)
* fcoe_hostlist_lookup_port() - find the corresponding lport by a given device
* @dev: this is currently ptr to net_device
*
* Called with fcoe_hostlist_lock held.
*
* Returns: NULL or the located fcoe_port
* Locking: must be called with the RNL mutex held
*/
static struct fcoe_interface *
fcoe_hostlist_lookup_port(const struct net_device *dev)
@ -1891,15 +1884,13 @@ fcoe_hostlist_lookup_port(const struct net_device *dev)
* @netdev: ptr to net_device
*
* Returns: 0 for success
* Locking: must be called with the RTNL mutex held
*/
struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev)
static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev)
{
struct fcoe_interface *fcoe;
read_lock(&fcoe_hostlist_lock);
fcoe = fcoe_hostlist_lookup_port(netdev);
read_unlock(&fcoe_hostlist_lock);
return (fcoe) ? fcoe->ctlr.lp : NULL;
}
@ -1908,20 +1899,19 @@ struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev)
* @lp: ptr to the fc_lport to be added
*
* Returns: 0 for success
* Locking: must be called with the RTNL mutex held
*/
int fcoe_hostlist_add(const struct fc_lport *lport)
static 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;
}
@ -1979,7 +1969,6 @@ static void __exit fcoe_exit(void)
{
unsigned int cpu;
struct fcoe_interface *fcoe, *tmp;
LIST_HEAD(local_list);
struct fcoe_port *port;
mutex_lock(&fcoe_config_mutex);
@ -1987,18 +1976,14 @@ static void __exit fcoe_exit(void)
fcoe_dev_cleanup();
/* releases the associated fcoe hosts */
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) {
rtnl_lock();
list_for_each_entry_safe(fcoe, tmp, &fcoe_hostlist, list) {
list_del(&fcoe->list);
port = lport_priv(fcoe->ctlr.lp);
rtnl_lock();
fcoe_interface_cleanup(fcoe);
rtnl_unlock();
schedule_work(&port->destroy_work);
}
rtnl_unlock();
unregister_hotcpu_notifier(&fcoe_cpu_notifier);