linux-kernel - [PATCH 1/2] IB/hns: Use kmalloc_array() in hns_roce_cmd_use

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Date:   Thu, 16 Feb 2017 10:02:58 +0100
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     linux-rdma@...r.kernel.org, Doug Ledford <dledford@...hat.com>,
        Hal Rosenstock <hal.rosenstock@...il.com>,
        Sean Hefty <sean.hefty@...el.com>,
        Wei Hu <xavier.huwei@...wei.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH 1/2] IB/hns: Use kmalloc_array() in hns_roce_cmd_use_events()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Thu, 16 Feb 2017 08:50:11 +0100

* A multiplication for the size determination of a memory allocation
  indicated that an array data structure should be processed.
  Thus use the corresponding function "kmalloc_array".

  This issue was detected by using the Coccinelle software.

* Replace the specification of a data structure by a pointer dereference
  to make the corresponding size determination a bit safer according to
  the Linux coding style convention.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/infiniband/hw/hns/hns_roce_cmd.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/infiniband/hw/hns/hns_roce_cmd.c b/drivers/infiniband/hw/hns/hns_roce_cmd.c
index 8c1f7a6f84d2..b94dcd823ad1 100644
--- a/drivers/infiniband/hw/hns/hns_roce_cmd.c
+++ b/drivers/infiniband/hw/hns/hns_roce_cmd.c
@@ -299,9 +299,9 @@ int hns_roce_cmd_use_events(struct hns_roce_dev *hr_dev)
 	struct hns_roce_cmdq *hr_cmd = &hr_dev->cmd;
 	int i;
 
-	hr_cmd->context = kmalloc(hr_cmd->max_cmds *
-				  sizeof(struct hns_roce_cmd_context),
-				  GFP_KERNEL);
+	hr_cmd->context = kmalloc_array(hr_cmd->max_cmds,
+					sizeof(*hr_cmd->context),
+					GFP_KERNEL);
 	if (!hr_cmd->context)
 		return -ENOMEM;
 
-- 
2.11.1