[net-next, v2 07/11] bnge: remove refcount from L2 filter

[Vikas Gupta <vikas.gupta@broadcom.com>]

A reference count was previously used under the assumption that any
context holding the last reference could delete the L2 filter.
However, going forward, the filter will only be removed by the same
context that created it, making refcount unnecessary.

The primary and secondary MAC addresses passed by the kernel are
guaranteed to be distinct, so each results in a filter being created
exactly once.

Signed-off-by: Vikas Gupta <vikas.gupta@broadcom.com>
Reviewed-by: Dharmender Garg <dharmender.garg@broadcom.com>
---
 .../net/ethernet/broadcom/bnge/bnge_filter.c  | 25 +++----------------
 .../net/ethernet/broadcom/bnge/bnge_filter.h  |  1 -
 2 files changed, 4 insertions(+), 22 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnge/bnge_filter.c b/drivers/net/ethernet/broadcom/bnge/bnge_filter.c
index d1279a4babcd..be392d154be3 100644
--- a/drivers/net/ethernet/broadcom/bnge/bnge_filter.c
+++ b/drivers/net/ethernet/broadcom/bnge/bnge_filter.c
@@ -13,8 +13,6 @@
 
 void bnge_del_l2_filter(struct bnge_net *bn, struct bnge_l2_filter *fltr)
 {
-	if (!refcount_dec_and_test(&fltr->refcnt))
-		return;
 	hlist_del_rcu(&fltr->base.hlist);
 	kfree_rcu(fltr, base.rcu);
 }
@@ -31,18 +29,17 @@ static void bnge_init_l2_filter(struct bnge_net *bn,
 
 	head = &bn->l2_fltr_hash_tbl[idx];
 	hlist_add_head_rcu(&fltr->base.hlist, head);
-	refcount_set(&fltr->refcnt, 1);
 }
 
-static struct bnge_l2_filter *__bnge_lookup_l2_filter(struct bnge_net *bn,
-						      struct bnge_l2_key *key,
-						      u32 idx)
+struct bnge_l2_filter *bnge_lookup_l2_filter(struct bnge_net *bn,
+					     struct bnge_l2_key *key,
+					     u32 idx)
 {
 	struct bnge_l2_filter *fltr;
 	struct hlist_head *head;
 
 	head = &bn->l2_fltr_hash_tbl[idx];
-	hlist_for_each_entry_rcu(fltr, head, base.hlist) {
+	hlist_for_each_entry(fltr, head, base.hlist) {
 		struct bnge_l2_key *l2_key = &fltr->l2_key;
 
 		if (ether_addr_equal(l2_key->dst_mac_addr, key->dst_mac_addr) &&
@@ -52,20 +49,6 @@ static struct bnge_l2_filter *__bnge_lookup_l2_filter(struct bnge_net *bn,
 	return NULL;
 }
 
-struct bnge_l2_filter *bnge_lookup_l2_filter(struct bnge_net *bn,
-					     struct bnge_l2_key *key,
-					     u32 idx)
-{
-	struct bnge_l2_filter *fltr;
-
-	rcu_read_lock();
-	fltr = __bnge_lookup_l2_filter(bn, key, idx);
-	if (fltr)
-		refcount_inc(&fltr->refcnt);
-	rcu_read_unlock();
-	return fltr;
-}
-
 static struct bnge_l2_filter *bnge_alloc_l2_filter(struct bnge_net *bn,
 						   struct bnge_l2_key *key,
 						   gfp_t gfp)
diff --git a/drivers/net/ethernet/broadcom/bnge/bnge_filter.h b/drivers/net/ethernet/broadcom/bnge/bnge_filter.h
index 44ee1357a0ff..16a5d91517c9 100644
--- a/drivers/net/ethernet/broadcom/bnge/bnge_filter.h
+++ b/drivers/net/ethernet/broadcom/bnge/bnge_filter.h
@@ -42,7 +42,6 @@ struct bnge_l2_filter {
 	/* base filter must be the first member */
 	struct bnge_filter_base	base;
 	struct bnge_l2_key	l2_key;
-	refcount_t		refcnt;
 };
 
 void bnge_del_l2_filter(struct bnge_net *bn, struct bnge_l2_filter *fltr);
-- 
2.47.1