linux-kernel - [PATCH 1/7] HID: sensor-hub: Use devm_kcalloc() in sensor_hub

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Date:   Mon, 24 Apr 2017 22:16:09 +0200
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     linux-iio@...r.kernel.org, linux-input@...r.kernel.org,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Bruno Prémont <bonbons@...ux-vserver.org>,
        Henrik Rydberg <rydberg@...math.org>,
        Jiri Kosina <jikos@...nel.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH 1/7] HID: sensor-hub: Use devm_kcalloc() in sensor_hub_probe()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Mon, 24 Apr 2017 19:25:29 +0200

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

  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/hid/hid-sensor-hub.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/hid/hid-sensor-hub.c b/drivers/hid/hid-sensor-hub.c
index 4ef73374a8f9..349494fc8def 100644
--- a/drivers/hid/hid-sensor-hub.c
+++ b/drivers/hid/hid-sensor-hub.c
@@ -672,9 +672,11 @@ static int sensor_hub_probe(struct hid_device *hdev,
 		ret = -EINVAL;
 		goto err_stop_hw;
 	}
-	sd->hid_sensor_hub_client_devs = devm_kzalloc(&hdev->dev, dev_cnt *
-						      sizeof(struct mfd_cell),
-						      GFP_KERNEL);
+	sd->hid_sensor_hub_client_devs
+		= devm_kcalloc(&hdev->dev,
+			       dev_cnt,
+			       sizeof(*sd->hid_sensor_hub_client_devs),
+			       GFP_KERNEL);
 	if (sd->hid_sensor_hub_client_devs == NULL) {
 		hid_err(hdev, "Failed to allocate memory for mfd cells\n");
 		ret = -ENOMEM;
-- 
2.12.2