There is a regular need in the kernel to provide a way to declare having a dynamically sized set of trailing elements in a structure. Kernel code should always use “flexible array members”[1] for these cases. The older style of one-element or zero-length arrays should no longer be used[2].
Refactor the code according to the use of a flexible-array member in struct phm_clock_voltage_dependency_table, instead of a one-element array, and use the struct_size() helper to calculate the size for the allocation.
[1] https://en.wikipedia.org/wiki/Flexible_array_member [2] https://www.kernel.org/doc/html/v5.9-rc1/process/deprecated.html#zero-length...
Build-tested-by: kernel test robot lkp@intel.com Link: https://lore.kernel.org/lkml/5f7c295c.8iqp1Ifc6oiVDq%2F%2F%25lkp@intel.com/ Signed-off-by: Gustavo A. R. Silva gustavoars@kernel.org --- drivers/gpu/drm/amd/pm/inc/hwmgr.h | 4 ++-- drivers/gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c | 9 +++------ drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu8_hwmgr.c | 2 +- drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu_helper.c | 5 ++--- 4 files changed, 8 insertions(+), 12 deletions(-)
diff --git a/drivers/gpu/drm/amd/pm/inc/hwmgr.h b/drivers/gpu/drm/amd/pm/inc/hwmgr.h index 3898a95ec28b..a1dbfd5636e6 100644 --- a/drivers/gpu/drm/amd/pm/inc/hwmgr.h +++ b/drivers/gpu/drm/amd/pm/inc/hwmgr.h @@ -122,8 +122,8 @@ struct phm_acpclock_voltage_dependency_record { };
struct phm_clock_voltage_dependency_table { - uint32_t count; /* Number of entries. */ - struct phm_clock_voltage_dependency_record entries[1]; /* Dynamically allocate count entries. */ + uint32_t count; /* Number of entries. */ + struct phm_clock_voltage_dependency_record entries[]; /* Dynamically allocate count entries. */ };
struct phm_phase_shedding_limits_record { diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c index 719597c5d27d..d94a7d8e0587 100644 --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c @@ -377,14 +377,11 @@ static int get_clock_voltage_dependency_table(struct pp_hwmgr *hwmgr, const ATOM_PPLIB_Clock_Voltage_Dependency_Table *table) {
- unsigned long table_size, i; + unsigned long i; struct phm_clock_voltage_dependency_table *dep_table;
- table_size = sizeof(unsigned long) + - sizeof(struct phm_clock_voltage_dependency_table) - * table->ucNumEntries; - - dep_table = kzalloc(table_size, GFP_KERNEL); + dep_table = kzalloc(struct_size(dep_table, entries, table->ucNumEntries), + GFP_KERNEL); if (NULL == dep_table) return -ENOMEM;
diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu8_hwmgr.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu8_hwmgr.c index 35ed47ebaf09..ed9b89980184 100644 --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu8_hwmgr.c +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu8_hwmgr.c @@ -276,7 +276,7 @@ static int smu8_init_dynamic_state_adjustment_rule_settings( { struct phm_clock_voltage_dependency_table *table_clk_vlt;
- table_clk_vlt = kzalloc(struct_size(table_clk_vlt, entries, 7), + table_clk_vlt = kzalloc(struct_size(table_clk_vlt, entries, 8), GFP_KERNEL);
if (NULL == table_clk_vlt) { diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu_helper.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu_helper.c index 60b5ca974356..b485f8b1d6f2 100644 --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu_helper.c +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu_helper.c @@ -492,13 +492,12 @@ int phm_get_sclk_for_voltage_evv(struct pp_hwmgr *hwmgr, */ int phm_initializa_dynamic_state_adjustment_rule_settings(struct pp_hwmgr *hwmgr) { - uint32_t table_size; struct phm_clock_voltage_dependency_table *table_clk_vlt; struct phm_ppt_v1_information *pptable_info = (struct phm_ppt_v1_information *)(hwmgr->pptable);
/* initialize vddc_dep_on_dal_pwrl table */ - table_size = sizeof(uint32_t) + 4 * sizeof(struct phm_clock_voltage_dependency_record); - table_clk_vlt = kzalloc(table_size, GFP_KERNEL); + table_clk_vlt = kzalloc(struct_size(table_clk_vlt, entries, 4), + GFP_KERNEL);
if (NULL == table_clk_vlt) { pr_err("Can not allocate space for vddc_dep_on_dal_pwrl! \n");