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authorStephen Hemminger <shemminger@vyatta.com>2009-06-12 19:02:46 +0000
committerDavid S. Miller <davem@davemloft.net>2009-06-13 23:28:54 -0700
commit7e0838404541d2758bee089632690aabd82f3d5d (patch)
tree08625e067250aab61a621cdae5aeb21f579bde3f /drivers/net/bonding
parentd93216051ae60995736518ca9ebb58a0e6ade212 (diff)
bonding: remove bonding read/write semaphore
The whole read/write semaphore locking can be removed. It doesn't add any protection that isn't already done by using the RTNL mutex properly. Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/bonding')
-rw-r--r--drivers/net/bonding/bond_main.c16
-rw-r--r--drivers/net/bonding/bond_sysfs.c23
-rw-r--r--drivers/net/bonding/bonding.h3
3 files changed, 6 insertions, 36 deletions
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 99ddd283e15..23b832ffe7a 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -3489,10 +3489,10 @@ static int bond_event_changename(struct bonding *bond)
{
bond_remove_proc_entry(bond);
bond_create_proc_entry(bond);
- down_write(&(bonding_rwsem));
+
bond_destroy_sysfs_entry(bond);
bond_create_sysfs_entry(bond);
- up_write(&(bonding_rwsem));
+
return NOTIFY_DONE;
}
@@ -4015,7 +4015,6 @@ static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd
return -EPERM;
}
- down_write(&(bonding_rwsem));
slave_dev = dev_get_by_name(&init_net, ifr->ifr_slave);
pr_debug("slave_dev=%p: \n", slave_dev);
@@ -4048,7 +4047,6 @@ static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd
dev_put(slave_dev);
}
- up_write(&(bonding_rwsem));
return res;
}
@@ -5123,8 +5121,6 @@ int bond_create(const char *name)
int res;
rtnl_lock();
- down_write(&bonding_rwsem);
-
/* Check to see if the bond already exists. */
if (name) {
list_for_each_entry(bond, &bond_dev_list, bond_list)
@@ -5173,24 +5169,20 @@ int bond_create(const char *name)
goto out_bond;
}
- up_write(&bonding_rwsem);
- rtnl_unlock(); /* allows sysfs registration of net device */
res = bond_create_sysfs_entry(netdev_priv(bond_dev));
if (res < 0)
goto out_unreg;
+ rtnl_unlock();
return 0;
out_unreg:
- rtnl_lock();
- down_write(&bonding_rwsem);
unregister_netdevice(bond_dev);
out_bond:
bond_deinit(bond_dev);
out_netdev:
free_netdev(bond_dev);
out_rtnl:
- up_write(&bonding_rwsem);
rtnl_unlock();
return res;
}
@@ -5209,8 +5201,6 @@ static int __init bonding_init(void)
bond_create_proc_dir();
- init_rwsem(&bonding_rwsem);
-
for (i = 0; i < max_bonds; i++) {
res = bond_create(NULL);
if (res)
diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index 1172fe64935..8041b679353 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -44,20 +44,6 @@
/*---------------------------- Declarations -------------------------------*/
static int expected_refcount = -1;
-/*--------------------------- Data Structures -----------------------------*/
-
-/* Bonding sysfs lock. Why can't we just use the subsystem lock?
- * Because kobject_register tries to acquire the subsystem lock. If
- * we already hold the lock (which we would if the user was creating
- * a new bond through the sysfs interface), we deadlock.
- * This lock is only needed when deleting a bond - we need to make sure
- * that we don't collide with an ongoing ioctl.
- */
-
-struct rw_semaphore bonding_rwsem;
-
-
-
/*------------------------------ Functions --------------------------------*/
@@ -70,7 +56,7 @@ static ssize_t bonding_show_bonds(struct class *cls, char *buf)
int res = 0;
struct bonding *bond;
- down_read(&(bonding_rwsem));
+ rtnl_lock();
list_for_each_entry(bond, &bond_dev_list, bond_list) {
if (res > (PAGE_SIZE - IFNAMSIZ)) {
@@ -84,7 +70,8 @@ static ssize_t bonding_show_bonds(struct class *cls, char *buf)
}
if (res)
buf[res-1] = '\n'; /* eat the leftover space */
- up_read(&(bonding_rwsem));
+
+ rtnl_unlock();
return res;
}
@@ -122,7 +109,6 @@ static ssize_t bonding_store_bonds(struct class *cls, const char *buffer, size_t
if (command[0] == '-') {
rtnl_lock();
- down_write(&bonding_rwsem);
list_for_each_entry(bond, &bond_dev_list, bond_list)
if (strnicmp(bond->dev->name, ifname, IFNAMSIZ) == 0) {
@@ -157,7 +143,6 @@ err_no_cmd:
return -EPERM;
out_unlock:
- up_write(&bonding_rwsem);
rtnl_unlock();
/* Always return either count or an error. If you return 0, you'll
@@ -253,7 +238,6 @@ static ssize_t bonding_store_slaves(struct device *d,
if (!rtnl_trylock())
return restart_syscall();
- down_write(&(bonding_rwsem));
sscanf(buffer, "%16s", command); /* IFNAMSIZ*/
ifname = command + 1;
@@ -357,7 +341,6 @@ err_no_cmd:
ret = -EPERM;
out:
- up_write(&(bonding_rwsem));
rtnl_unlock();
return ret;
}
diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
index a6efa096371..af81e9b7fe3 100644
--- a/drivers/net/bonding/bonding.h
+++ b/drivers/net/bonding/bonding.h
@@ -351,9 +351,6 @@ extern const struct bond_parm_tbl arp_validate_tbl[];
extern const struct bond_parm_tbl fail_over_mac_tbl[];
extern struct bond_parm_tbl ad_select_tbl[];
-/* exported from bond_sysfs.c */
-extern struct rw_semaphore bonding_rwsem;
-
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
void bond_send_unsolicited_na(struct bonding *bond);
void bond_register_ipv6_notifier(void);