From: Maninder Singh <maninder1.s@samsung.com>
Date: Wed, 8 Jul 2015 04:13:35 +0000 (+0530)
Subject: IB/mlx4: Optimize freeing of items on error unwind
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a39a98ff4cc8b514fe6fa551f6ed59cd60e07da2;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

IB/mlx4: Optimize freeing of items on error unwind

On failure, we loop through all possible pointers and test them before
calling kfree.  But really, why even attempt to free items we didn't
allocate when we can easily loop through exactly and only the devices
for which the original memory allocation succeeded and free just those.

Signed-off-by: Maninder Singh <maninder1.s@samsung.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
---

diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c
index f419a728a22b..064454aee863 100644
--- a/drivers/infiniband/hw/mlx4/main.c
+++ b/drivers/infiniband/hw/mlx4/main.c
@@ -2670,17 +2670,15 @@ static void do_slave_init(struct mlx4_ib_dev *ibdev, int slave, int do_init)
 	dm = kcalloc(ports, sizeof(*dm), GFP_ATOMIC);
 	if (!dm) {
 		pr_err("failed to allocate memory for tunneling qp update\n");
-		goto out;
+		return;
 	}
 
 	for (i = 0; i < ports; i++) {
 		dm[i] = kmalloc(sizeof (struct mlx4_ib_demux_work), GFP_ATOMIC);
 		if (!dm[i]) {
 			pr_err("failed to allocate memory for tunneling qp update work struct\n");
-			for (i = 0; i < dev->caps.num_ports; i++) {
-				if (dm[i])
-					kfree(dm[i]);
-			}
+			while (--i >= 0)
+				kfree(dm[i]);
 			goto out;
 		}
 	}