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From 858d8b322e68798defb121cf5b17ca55db2e1189 Mon Sep 17 00:00:00 2001
From: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
Date: Tue, 19 Feb 2019 12:55:09 -0600
Subject: [PATCH 1272/2940] drm/amd/powerplay/smu10_hwmgr: use struct_size() in
kzalloc()
One of the more common cases of allocation size calculations is finding
the size of a structure that has a zero-sized array at the end, along
with memory for some number of elements for that array. For example:
struct foo {
int stuff;
struct boo entry[];
};
size = sizeof(struct foo) + count * sizeof(struct boo);
instance = kzalloc(size, GFP_KERNEL);
Instead of leaving these open-coded and prone to type mistakes, we can
now use the new struct_size() helper:
instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL);
Notice that, in this case, variable table_size is not necessary, hence
it is removed.
This code was detected with the help of Coccinelle.
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
drivers/gpu/drm/amd/powerplay/hwmgr/smu10_hwmgr.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/smu10_hwmgr.c b/drivers/gpu/drm/amd/powerplay/hwmgr/smu10_hwmgr.c
index 5273de3c5b98..0ad8fe4a6277 100644
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/smu10_hwmgr.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/smu10_hwmgr.c
@@ -139,12 +139,10 @@ static int smu10_construct_max_power_limits_table(struct pp_hwmgr *hwmgr,
static int smu10_init_dynamic_state_adjustment_rule_settings(
struct pp_hwmgr *hwmgr)
{
- uint32_t table_size =
- sizeof(struct phm_clock_voltage_dependency_table) +
- (7 * sizeof(struct phm_clock_voltage_dependency_record));
+ struct phm_clock_voltage_dependency_table *table_clk_vlt;
- struct phm_clock_voltage_dependency_table *table_clk_vlt =
- kzalloc(table_size, GFP_KERNEL);
+ table_clk_vlt = kzalloc(struct_size(table_clk_vlt, entries, 7),
+ GFP_KERNEL);
if (NULL == table_clk_vlt) {
pr_err("Can not allocate memory!\n");
--
2.17.1
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