bonding: adjust locking comments
Now that locks have been removed, remove some unnecessary comments and
adjust others to reflect reality. Also add a comment to "mode_lock" to
describe its current users and give a brief summary why they need it.
Signed-off-by: Nikolay Aleksandrov <nikolay@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c
index 876b97f..85af961 100644
--- a/drivers/net/bonding/bond_alb.c
+++ b/drivers/net/bonding/bond_alb.c
@@ -119,7 +119,6 @@
SLAVE_TLB_INFO(slave).head = TLB_NULL_INDEX;
}
-/* Caller must hold bond lock for read, BH disabled */
static void __tlb_clear_slave(struct bonding *bond, struct slave *slave,
int save_load)
{
@@ -142,7 +141,6 @@
tlb_init_slave(slave);
}
-/* Caller must hold bond lock for read */
static void tlb_clear_slave(struct bonding *bond, struct slave *slave,
int save_load)
{
@@ -199,7 +197,6 @@
(s64) (SLAVE_TLB_INFO(slave).load << 3); /* Bytes to bits */
}
-/* Caller must hold bond lock for read */
static struct slave *tlb_get_least_loaded_slave(struct bonding *bond)
{
struct slave *slave, *least_loaded;
@@ -337,7 +334,6 @@
return RX_HANDLER_ANOTHER;
}
-/* Caller must hold bond lock for read */
static struct slave *rlb_next_rx_slave(struct bonding *bond)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
@@ -370,7 +366,7 @@
return rx_slave;
}
-/* Caller must hold rcu_read_lock() for read */
+/* Caller must hold rcu_read_lock() */
static struct slave *__rlb_next_rx_slave(struct bonding *bond)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
@@ -749,7 +745,6 @@
return tx_slave;
}
-/* Caller must hold bond lock for read */
static void rlb_rebalance(struct bonding *bond)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
@@ -1677,7 +1672,6 @@
}
-/* Caller must hold bond lock for read */
void bond_alb_handle_link_change(struct bonding *bond, struct slave *slave, char link)
{
struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 116cf69..2d90a8b 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1629,7 +1629,7 @@
/*
* Try to release the slave device <slave> from the bond device <master>
* It is legal to access curr_active_slave without a lock because all the function
- * is write-locked. If "all" is true it means that the function is being called
+ * is RTNL-locked. If "all" is true it means that the function is being called
* while destroying a bond interface and all slaves are being released.
*
* The rules for slave state should be:
@@ -2494,7 +2494,7 @@
* place for the slave. Returns 0 if no changes are found, >0 if changes
* to link states must be committed.
*
- * Called with rcu_read_lock hold.
+ * Called with rcu_read_lock held.
*/
static int bond_ab_arp_inspect(struct bonding *bond)
{
@@ -2642,7 +2642,7 @@
/*
* Send ARP probes for active-backup mode ARP monitor.
*
- * Called with rcu_read_lock hold.
+ * Called with rcu_read_lock held.
*/
static bool bond_ab_arp_probe(struct bonding *bond)
{
diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
index 0cda34b..3aff1a8 100644
--- a/drivers/net/bonding/bonding.h
+++ b/drivers/net/bonding/bonding.h
@@ -195,6 +195,12 @@
s32 slave_cnt; /* never change this value outside the attach/detach wrappers */
int (*recv_probe)(const struct sk_buff *, struct bonding *,
struct slave *);
+ /* mode_lock is used for mode-specific locking needs, currently used by:
+ * 3ad mode (4) - protect against running bond_3ad_unbind_slave() and
+ * bond_3ad_state_machine_handler() concurrently.
+ * TLB mode (5) - to sync the use and modifications of its hash table
+ * ALB mode (6) - to sync the use and modifications of its hash table
+ */
spinlock_t mode_lock;
u8 send_peer_notif;
u8 igmp_retrans;