From: Gustavo A. R. Silva Date: Tue, 19 Feb 2019 18:55:09 +0000 (-0600) Subject: drm/amd/powerplay/smu10_hwmgr: use struct_size() in kzalloc() X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=bcb35dad1d3181e3cb4e5ac067bfc4aed53c592c;p=linux.git 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 Signed-off-by: Alex Deucher --- diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/smu10_hwmgr.c b/drivers/gpu/drm/amd/powerplay/hwmgr/smu10_hwmgr.c index f95c5f50eb0f0..b45b0d0e77265 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");