linux-kernel - [PATCH 2/2] ACPI-scan: Improve a size determination in three functions

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Date:   Fri, 29 Sep 2017 22:18:58 +0200
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     linux-acpi@...r.kernel.org, Len Brown <lenb@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Zhang Rui <rui.zhang@...el.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH 2/2] ACPI-scan: Improve a size determination in three
 functions

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Fri, 29 Sep 2017 22:00:25 +0200

Replace the specification of data structures by pointer dereferences
as the parameter for the operator "sizeof" to make the corresponding size
determination a bit safer according to the Linux coding style convention.

This issue was detected by using the Coccinelle software.

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

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 7df7bea1e177..34bc7274dc8e 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -650,7 +650,7 @@ int acpi_device_add(struct acpi_device *device,
 	INIT_LIST_HEAD(&device->del_list);
 	mutex_init(&device->physical_node_lock);
 
-	new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
+	new_bus_id = kzalloc(sizeof(*new_bus_id), GFP_KERNEL);
 	if (!new_bus_id) {
 		result = -ENOMEM;
 		goto err_detach;
@@ -1577,7 +1577,7 @@ static int acpi_add_single_object(struct acpi_device **child,
 	struct acpi_device *device;
 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 
-	device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
+	device = kzalloc(sizeof(*device), GFP_KERNEL);
 	if (!device)
 		return -ENOMEM;
 
@@ -1786,7 +1786,7 @@ static void acpi_device_dep_initialize(struct acpi_device *adev)
 		if (skip)
 			continue;
 
-		dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
+		dep = kzalloc(sizeof(*dep), GFP_KERNEL);
 		if (!dep)
 			return;
 
-- 
2.14.2