linux-kernel - [PATCH] HID: amd_sfh: Drop redundant memset

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Message-ID: <1650532656-27602-1-git-send-email-baihaowen@meizu.com>
Date:   Thu, 21 Apr 2022 17:17:36 +0800
From:   Haowen Bai <baihaowen@...zu.com>
To:     Basavaraj Natikar <basavaraj.natikar@....com>,
        Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>
CC:     Haowen Bai <baihaowen@...zu.com>, <linux-input@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] HID: amd_sfh: Drop redundant memset

The region set by the call to memset is immediately overwritten by the
subsequent call to memcpy. So we drop redundant memset.

Signed-off-by: Haowen Bai <baihaowen@...zu.com>
---
 drivers/hid/amd-sfh-hid/hid_descriptor/amd_sfh_hid_desc.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/drivers/hid/amd-sfh-hid/hid_descriptor/amd_sfh_hid_desc.c b/drivers/hid/amd-sfh-hid/hid_descriptor/amd_sfh_hid_desc.c
index 76095bd53c65..26ccdcfbcda5 100644
--- a/drivers/hid/amd-sfh-hid/hid_descriptor/amd_sfh_hid_desc.c
+++ b/drivers/hid/amd-sfh-hid/hid_descriptor/amd_sfh_hid_desc.c
@@ -33,27 +33,22 @@ int get_report_descriptor(int sensor_idx, u8 *rep_desc)
 {
 	switch (sensor_idx) {
 	case accel_idx: /* accel */
-		memset(rep_desc, 0, sizeof(accel3_report_descriptor));
 		memcpy(rep_desc, accel3_report_descriptor,
 		       sizeof(accel3_report_descriptor));
 		break;
 	case gyro_idx: /* gyro */
-		memset(rep_desc, 0, sizeof(gyro3_report_descriptor));
 		memcpy(rep_desc, gyro3_report_descriptor,
 		       sizeof(gyro3_report_descriptor));
 		break;
 	case mag_idx: /* Magnetometer */
-		memset(rep_desc, 0, sizeof(comp3_report_descriptor));
 		memcpy(rep_desc, comp3_report_descriptor,
 		       sizeof(comp3_report_descriptor));
 		break;
 	case als_idx: /* ambient light sensor */
-		memset(rep_desc, 0, sizeof(als_report_descriptor));
 		memcpy(rep_desc, als_report_descriptor,
 		       sizeof(als_report_descriptor));
 		break;
 	case HPD_IDX: /* HPD sensor */
-		memset(rep_desc, 0, sizeof(hpd_report_descriptor));
 		memcpy(rep_desc, hpd_report_descriptor,
 		       sizeof(hpd_report_descriptor));
 		break;
-- 
2.7.4