From: Gustavo A. R. Silva Date: Tue, 19 Feb 2019 18:42:32 +0000 (-0600) Subject: drm/amd/powerplay/smu8_hwmgr: use struct_size() in kzalloc() X-Git-Tag: v5.15~6763^2~10^2~7 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=7f5725f9802502651644e874bb9a59e66215839d;p=platform%2Fkernel%2Flinux-starfive.git drm/amd/powerplay/smu8_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 Signed-off-by: Alex Deucher --- diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/smu8_hwmgr.c b/drivers/gpu/drm/amd/powerplay/hwmgr/smu8_hwmgr.c index 553a203..019d6a2 100644 --- a/drivers/gpu/drm/amd/powerplay/hwmgr/smu8_hwmgr.c +++ b/drivers/gpu/drm/amd/powerplay/hwmgr/smu8_hwmgr.c @@ -272,12 +272,10 @@ static int smu8_init_dynamic_state_adjustment_rule_settings( struct pp_hwmgr *hwmgr, ATOM_CLK_VOLT_CAPABILITY *disp_voltage_table) { - 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");