netdev - [PATCH AUTOSEL 5.10 057/137] net: bridge: mrp: Update ring transitions.

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Date:   Tue,  6 Jul 2021 07:20:43 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Horatiu Vultur <horatiu.vultur@...rochip.com>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>,
        bridge@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 5.10 057/137] net: bridge: mrp: Update ring transitions.

From: Horatiu Vultur <horatiu.vultur@...rochip.com>

[ Upstream commit fcb34635854a5a5814227628867ea914a9805384 ]

According to the standard IEC 62439-2, the number of transitions needs
to be counted for each transition 'between' ring state open and ring
state closed and not from open state to closed state.

Therefore fix this for both ring and interconnect ring.

Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/bridge/br_mrp.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/net/bridge/br_mrp.c b/net/bridge/br_mrp.c
index d1336a7ad7ff..3259f5480127 100644
--- a/net/bridge/br_mrp.c
+++ b/net/bridge/br_mrp.c
@@ -607,8 +607,7 @@ int br_mrp_set_ring_state(struct net_bridge *br,
 	if (!mrp)
 		return -EINVAL;
 
-	if (mrp->ring_state == BR_MRP_RING_STATE_CLOSED &&
-	    state->ring_state != BR_MRP_RING_STATE_CLOSED)
+	if (mrp->ring_state != state->ring_state)
 		mrp->ring_transitions++;
 
 	mrp->ring_state = state->ring_state;
@@ -690,8 +689,7 @@ int br_mrp_set_in_state(struct net_bridge *br, struct br_mrp_in_state *state)
 	if (!mrp)
 		return -EINVAL;
 
-	if (mrp->in_state == BR_MRP_IN_STATE_CLOSED &&
-	    state->in_state != BR_MRP_IN_STATE_CLOSED)
+	if (mrp->in_state != state->in_state)
 		mrp->in_transitions++;
 
 	mrp->in_state = state->in_state;
-- 
2.30.2