From: Saeed Mahameed <saeedm@mellanox.com>
Date: Wed, 7 Feb 2018 20:48:43 -0800
Subject: net/mlx5: Add missing likely/unlikely hints to cq events
Patch-mainline: v4.17-rc1
Git-commit: d2ff4fa575000058def5f5c602784e233211d4e7
References: bsc#1103990 FATE#326006

If a hardware event is targeting a CQ, that CQ should exist.
Add unlikely to error handling flows.

Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Reviewed-by: Gal Pressman <galp@mellanox.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/mellanox/mlx5/core/cq.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/net/ethernet/mellanox/mlx5/core/cq.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/cq.c
@@ -97,7 +97,7 @@ void mlx5_cq_completion(struct mlx5_eq *
 		refcount_inc(&cq->refcount);
 	spin_unlock(&table->lock);
 
-	if (!cq) {
+	if (unlikely(!cq)) {
 		mlx5_core_warn(eq->dev, "Completion event for bogus CQ 0x%x\n", cqn);
 		return;
 	}
@@ -118,12 +118,12 @@ void mlx5_cq_event(struct mlx5_eq *eq, u
 	spin_lock(&table->lock);
 
 	cq = radix_tree_lookup(&table->tree, cqn);
-	if (cq)
+	if (likely(cq))
 		refcount_inc(&cq->refcount);
 
 	spin_unlock(&table->lock);
 
-	if (!cq) {
+	if (unlikely(!cq)) {
 		mlx5_core_warn(eq->dev, "Async event for bogus CQ 0x%x\n", cqn);
 		return;
 	}