linux-kernel - [PATCH] drm/amd/powerplay: remove unnecessary call to memset

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1505133446-32349-1-git-send-email-himanshujha199640@gmail.com>
Date:   Mon, 11 Sep 2017 18:07:26 +0530
From:   Himanshu Jha <himanshujha199640@...il.com>
To:     airlied@...ux.ie
Cc:     christian.koenig@....com, alexander.deucher@....com,
        Rex.Zhu@....com, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Himanshu Jha <himanshujha199640@...il.com>
Subject: [PATCH] drm/amd/powerplay: remove unnecessary call to memset

call to memset to assign 0 value immediately after allocating
memory with kzalloc is unnecesaary as kzalloc allocates the memory
filled with 0 value.

Semantic patch used to resolve this issue:

@@
expression e,e2; constant c;
statement S;
@@

  e = kzalloc(e2, c);
  if(e == NULL) S
- memset(e, 0, e2);

Signed-off-by: Himanshu Jha <himanshujha199640@...il.com>
---
 .../drm/amd/powerplay/hwmgr/process_pptables_v1_0.c  | 20 --------------------
 1 file changed, 20 deletions(-)

diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/process_pptables_v1_0.c b/drivers/gpu/drm/amd/powerplay/hwmgr/process_pptables_v1_0.c
index 84f01fd3..d1af148 100644
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/process_pptables_v1_0.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/process_pptables_v1_0.c
@@ -173,8 +173,6 @@ static int get_vddc_lookup_table(
 	if (NULL == table)
 		return -ENOMEM;
 
-	memset(table, 0x00, table_size);
-
 	table->count = vddc_lookup_pp_tables->ucNumEntries;
 
 	for (i = 0; i < vddc_lookup_pp_tables->ucNumEntries; i++) {
@@ -335,8 +333,6 @@ static int get_valid_clk(
 	if (NULL == table)
 		return -ENOMEM;
 
-	memset(table, 0x00, table_size);
-
 	table->count = (uint32_t)clk_volt_pp_table->count;
 
 	for (i = 0; i < table->count; i++) {
@@ -390,8 +386,6 @@ static int get_mclk_voltage_dependency_table(
 	if (NULL == mclk_table)
 		return -ENOMEM;
 
-	memset(mclk_table, 0x00, table_size);
-
 	mclk_table->count = (uint32_t)mclk_dep_table->ucNumEntries;
 
 	for (i = 0; i < mclk_dep_table->ucNumEntries; i++) {
@@ -439,8 +433,6 @@ static int get_sclk_voltage_dependency_table(
 		if (NULL == sclk_table)
 			return -ENOMEM;
 
-		memset(sclk_table, 0x00, table_size);
-
 		sclk_table->count = (uint32_t)tonga_table->ucNumEntries;
 
 		for (i = 0; i < tonga_table->ucNumEntries; i++) {
@@ -473,8 +465,6 @@ static int get_sclk_voltage_dependency_table(
 		if (NULL == sclk_table)
 			return -ENOMEM;
 
-		memset(sclk_table, 0x00, table_size);
-
 		sclk_table->count = (uint32_t)polaris_table->ucNumEntries;
 
 		for (i = 0; i < polaris_table->ucNumEntries; i++) {
@@ -525,8 +515,6 @@ static int get_pcie_table(
 		if (pcie_table == NULL)
 			return -ENOMEM;
 
-		memset(pcie_table, 0x00, table_size);
-
 		/*
 		* Make sure the number of pcie entries are less than or equal to sclk dpm levels.
 		* Since first PCIE entry is for ULV, #pcie has to be <= SclkLevel + 1.
@@ -567,8 +555,6 @@ static int get_pcie_table(
 		if (pcie_table == NULL)
 			return -ENOMEM;
 
-		memset(pcie_table, 0x00, table_size);
-
 		/*
 		* Make sure the number of pcie entries are less than or equal to sclk dpm levels.
 		* Since first PCIE entry is for ULV, #pcie has to be <= SclkLevel + 1.
@@ -615,8 +601,6 @@ static int get_cac_tdp_table(
 	if (NULL == tdp_table)
 		return -ENOMEM;
 
-	memset(tdp_table, 0x00, table_size);
-
 	hwmgr->dyn_state.cac_dtp_table = kzalloc(table_size, GFP_KERNEL);
 
 	if (NULL == hwmgr->dyn_state.cac_dtp_table) {
@@ -624,8 +608,6 @@ static int get_cac_tdp_table(
 		return -ENOMEM;
 	}
 
-	memset(hwmgr->dyn_state.cac_dtp_table, 0x00, table_size);
-
 	if (table->ucRevId < 3) {
 		const ATOM_Tonga_PowerTune_Table *tonga_table =
 			(ATOM_Tonga_PowerTune_Table *)table;
@@ -725,8 +707,6 @@ static int get_mm_clock_voltage_table(
 	if (NULL == mm_table)
 		return -ENOMEM;
 
-	memset(mm_table, 0x00, table_size);
-
 	mm_table->count = mm_dependency_table->ucNumEntries;
 
 	for (i = 0; i < mm_dependency_table->ucNumEntries; i++) {
-- 
2.7.4