linux-kernel - [PATCH v2 15/35] net/ethernet: Use kmemdup rather than duplicating its implementation

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Message-Id: <20190703162915.32553-1-huangfq.daxian@gmail.com>
Date:   Thu,  4 Jul 2019 00:29:15 +0800
From:   Fuqian Huang <huangfq.daxian@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Tariq Toukan <tariqt@...lanox.com>,
        "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        Fuqian Huang <huangfq.daxian@...il.com>
Subject: [PATCH v2 15/35] net/ethernet: Use kmemdup rather than duplicating its implementation

kmemdup is introduced to duplicate a region of memory in a neat way.
Rather than kmalloc/kzalloc + memcpy, which the programmer needs to
write the size twice (sometimes lead to mistakes), kmemdup improves
readability, leads to smaller code and also reduce the chances of mistakes.
Suggestion to use kmemdup rather than using kmalloc/kzalloc + memcpy.

Signed-off-by: Fuqian Huang <huangfq.daxian@...il.com>
---
Changes in v2:
  - Fix a typo in commit message (memset -> memcpy)

 drivers/net/ethernet/mellanox/mlx4/resource_tracker.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c b/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c
index 4356f3a58002..e971a6bdf0d5 100644
--- a/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c
+++ b/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c
@@ -4437,14 +4437,13 @@ int mlx4_QP_FLOW_STEERING_ATTACH_wrapper(struct mlx4_dev *dev, int slave,
 		goto err_detach;
 
 	mbox_size = qp_attach_mbox_size(inbox->buf);
-	rrule->mirr_mbox = kmalloc(mbox_size, GFP_KERNEL);
+	rrule->mirr_mbox = kmemdup(inbox->buf, mbox_size, GFP_KERNEL);
 	if (!rrule->mirr_mbox) {
 		err = -ENOMEM;
 		goto err_put_rule;
 	}
 	rrule->mirr_mbox_size = mbox_size;
 	rrule->mirr_rule_id = 0;
-	memcpy(rrule->mirr_mbox, inbox->buf, mbox_size);
 
 	/* set different port */
 	ctrl = (struct mlx4_net_trans_rule_hw_ctrl *)rrule->mirr_mbox;
-- 
2.11.0