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_ppt_v1_mm_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/5f7d61e2.qiTVTyG2pVoG8bb0%25lkp@intel.com/ Signed-off-by: Gustavo A. R. Silva gustavoars@kernel.org --- drivers/gpu/drm/amd/pm/powerplay/hwmgr/hwmgr_ppt.h | 2 +- .../amd/pm/powerplay/hwmgr/process_pptables_v1_0.c | 11 ++++------- .../amd/pm/powerplay/hwmgr/vega10_processpptables.c | 9 +++------ 3 files changed, 8 insertions(+), 14 deletions(-)
diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/hwmgr_ppt.h b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/hwmgr_ppt.h index c167083b0872..923cc04e405a 100644 --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/hwmgr_ppt.h +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/hwmgr_ppt.h @@ -71,7 +71,7 @@ typedef struct phm_ppt_v1_mm_clock_voltage_dependency_record phm_ppt_v1_mm_clock
struct phm_ppt_v1_mm_clock_voltage_dependency_table { uint32_t count; /* Number of entries. */ - phm_ppt_v1_mm_clock_voltage_dependency_record entries[1]; /* Dynamically allocate count entries. */ + phm_ppt_v1_mm_clock_voltage_dependency_record entries[]; /* Dynamically allocate count entries. */ }; typedef struct phm_ppt_v1_mm_clock_voltage_dependency_table phm_ppt_v1_mm_clock_voltage_dependency_table;
diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/process_pptables_v1_0.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/process_pptables_v1_0.c index 0725531fbfff..5d8016cd1986 100644 --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/process_pptables_v1_0.c +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/process_pptables_v1_0.c @@ -678,19 +678,16 @@ static int get_mm_clock_voltage_table( const ATOM_Tonga_MM_Dependency_Table * mm_dependency_table ) { - uint32_t table_size, i; + uint32_t i; const ATOM_Tonga_MM_Dependency_Record *mm_dependency_record; phm_ppt_v1_mm_clock_voltage_dependency_table *mm_table; phm_ppt_v1_mm_clock_voltage_dependency_record *mm_table_record;
PP_ASSERT_WITH_CODE((0 != mm_dependency_table->ucNumEntries), "Invalid PowerPlay Table!", return -1); - table_size = sizeof(uint32_t) + - sizeof(phm_ppt_v1_mm_clock_voltage_dependency_record) - * mm_dependency_table->ucNumEntries; - mm_table = kzalloc(table_size, GFP_KERNEL); - - if (NULL == mm_table) + mm_table = kzalloc(struct_size(mm_table, entries, mm_dependency_table->ucNumEntries), + GFP_KERNEL); + if (!mm_table) return -ENOMEM;
mm_table->count = mm_dependency_table->ucNumEntries; diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_processpptables.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_processpptables.c index 787b23fa25e7..4f6a73a2cf28 100644 --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_processpptables.c +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega10_processpptables.c @@ -344,18 +344,15 @@ static int get_mm_clock_voltage_table( phm_ppt_v1_mm_clock_voltage_dependency_table **vega10_mm_table, const ATOM_Vega10_MM_Dependency_Table *mm_dependency_table) { - uint32_t table_size, i; + uint32_t i; const ATOM_Vega10_MM_Dependency_Record *mm_dependency_record; phm_ppt_v1_mm_clock_voltage_dependency_table *mm_table;
PP_ASSERT_WITH_CODE((mm_dependency_table->ucNumEntries != 0), "Invalid PowerPlay Table!", return -1);
- table_size = sizeof(uint32_t) + - sizeof(phm_ppt_v1_mm_clock_voltage_dependency_record) * - mm_dependency_table->ucNumEntries; - mm_table = kzalloc(table_size, GFP_KERNEL); - + mm_table = kzalloc(struct_size(mm_table, entries, mm_dependency_table->ucNumEntries), + GFP_KERNEL); if (!mm_table) return -ENOMEM;