bonding: Convert more locks to _bh, acquire rtnl, for new locking
Convert more lock acquisitions to _bh flavor to avoid deadlock
with workqueue activity and add acquisition of RTNL in appropriate places.
Affects ALB mode, as well as core bonding functions and sysfs.
Signed-off-by: Andy Gospodarek <andy@greyhouse.net>
Signed-off-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index 19d970e..7a06ade 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -229,7 +229,7 @@
int i, res = 0;
struct bonding *bond = to_bond(d);
- read_lock_bh(&bond->lock);
+ read_lock(&bond->lock);
bond_for_each_slave(bond, slave, i) {
if (res > (PAGE_SIZE - IFNAMSIZ)) {
/* not enough space for another interface name */
@@ -240,7 +240,7 @@
}
res += sprintf(buf + res, "%s ", slave->dev->name);
}
- read_unlock_bh(&bond->lock);
+ read_unlock(&bond->lock);
res += sprintf(buf + res, "\n");
res++;
return res;
@@ -282,18 +282,18 @@
/* Got a slave name in ifname. Is it already in the list? */
found = 0;
- read_lock_bh(&bond->lock);
+ read_lock(&bond->lock);
bond_for_each_slave(bond, slave, i)
if (strnicmp(slave->dev->name, ifname, IFNAMSIZ) == 0) {
printk(KERN_ERR DRV_NAME
": %s: Interface %s is already enslaved!\n",
bond->dev->name, ifname);
ret = -EPERM;
- read_unlock_bh(&bond->lock);
+ read_unlock(&bond->lock);
goto out;
}
- read_unlock_bh(&bond->lock);
+ read_unlock(&bond->lock);
printk(KERN_INFO DRV_NAME ": %s: Adding slave %s.\n",
bond->dev->name, ifname);
dev = dev_get_by_name(&init_net, ifname);
@@ -1133,6 +1133,9 @@
}
out:
write_unlock_bh(&bond->lock);
+
+ rtnl_unlock();
+
return count;
}
static DEVICE_ATTR(primary, S_IRUGO | S_IWUSR, bonding_show_primary, bonding_store_primary);
@@ -1190,6 +1193,7 @@
struct bonding *bond = to_bond(d);
int count;
+ rtnl_lock();
read_lock(&bond->curr_slave_lock);
curr = bond->curr_active_slave;
@@ -1269,6 +1273,8 @@
}
out:
write_unlock_bh(&bond->lock);
+ rtnl_unlock();
+
return count;
}