linux-kernel - [PATCH] drm/amdgpu: Senseless code and unnecessary memset

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Date:   Tue,  5 Apr 2022 20:36:31 +0300
From:   Grigory Vasilyev <h0tc0d3@...il.com>
To:     Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        Melissa Wen <mwen@...lia.com>
Cc:     Grigory Vasilyev <h0tc0d3@...il.com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jani Nikula <jani.nikula@...el.com>,
        Jiawei Gu <Jiawei.Gu@....com>,
        Lucas De Marchi <lucas.demarchi@...el.com>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] drm/amdgpu: Senseless code and unnecessary memset

Using memset on local arrays before exiting the function is pointless.
Compilator will remove this code. Also for local arrays is preferable to
use {0} instead of memset. Mistakes are often made when working with
memset.

Signed-off-by: Grigory Vasilyev <h0tc0d3@...il.com>
---
 drivers/gpu/drm/amd/amdgpu/atom.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/atom.c b/drivers/gpu/drm/amd/amdgpu/atom.c
index be9d61bcb8ae..537e48fbbe6b 100644
--- a/drivers/gpu/drm/amd/amdgpu/atom.c
+++ b/drivers/gpu/drm/amd/amdgpu/atom.c
@@ -1538,11 +1538,9 @@ struct atom_context *amdgpu_atom_parse(struct card_info *card, void *bios)
 int amdgpu_atom_asic_init(struct atom_context *ctx)
 {
 	int hwi = CU16(ctx->data_table + ATOM_DATA_FWI_PTR);
-	uint32_t ps[16];
+	uint32_t ps[16] = {0};
 	int ret;
 
-	memset(ps, 0, 64);
-
 	ps[0] = cpu_to_le32(CU32(hwi + ATOM_FWI_DEFSCLK_PTR));
 	ps[1] = cpu_to_le32(CU32(hwi + ATOM_FWI_DEFMCLK_PTR));
 	if (!ps[0] || !ps[1])
@@ -1551,10 +1549,6 @@ int amdgpu_atom_asic_init(struct atom_context *ctx)
 	if (!CU16(ctx->cmd_table + 4 + 2 * ATOM_CMD_INIT))
 		return 1;
 	ret = amdgpu_atom_execute_table(ctx, ATOM_CMD_INIT, ps);
-	if (ret)
-		return ret;
-
-	memset(ps, 0, 64);
 
 	return ret;
 }
-- 
2.35.1