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_uvd_clock_voltage_dependency_table, instead of a one-element array, and use the struct_size() helper to calculate the size for the allocation. Also, save some heap space as the original code is multiplying table->numEntries by sizeof(struct phm_uvd_clock_voltage_dependency_table) when it should have multiplied it by sizeof(phm_uvd_clock_voltage_dependency_record) instead. [1] https://en.wikipedia.org/wiki/Flexible_array_member [2] https://www.kernel.org/doc/html/v5.9-rc1/process/deprecated.html#zero-length-and-one-element-arrays Build-tested-by: kernel test robot <lkp@xxxxxxxxx> Link: https://lore.kernel.org/lkml/5f7c433e.pXkC6KsN6HN%2FLdhj%25lkp@xxxxxxxxx/ Signed-off-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx> --- drivers/gpu/drm/amd/pm/inc/hwmgr.h | 2 +- .../gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c | 11 ++++------- 2 files changed, 5 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/amd/pm/inc/hwmgr.h b/drivers/gpu/drm/amd/pm/inc/hwmgr.h index e84cff09af2d..2f1886bc5535 100644 --- a/drivers/gpu/drm/amd/pm/inc/hwmgr.h +++ b/drivers/gpu/drm/amd/pm/inc/hwmgr.h @@ -140,7 +140,7 @@ struct phm_uvd_clock_voltage_dependency_record { struct phm_uvd_clock_voltage_dependency_table { uint8_t count; - struct phm_uvd_clock_voltage_dependency_record entries[1]; + struct phm_uvd_clock_voltage_dependency_record entries[]; }; struct phm_acp_clock_voltage_dependency_record { diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c index d9bed4df6f65..305d95c4162d 100644 --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c @@ -1105,15 +1105,12 @@ static int get_uvd_clock_voltage_limit_table(struct pp_hwmgr *hwmgr, const ATOM_PPLIB_UVD_Clock_Voltage_Limit_Table *table, const UVDClockInfoArray *array) { - unsigned long table_size, i; + unsigned long i; struct phm_uvd_clock_voltage_dependency_table *uvd_table; - table_size = sizeof(unsigned long) + - sizeof(struct phm_uvd_clock_voltage_dependency_table) * - table->numEntries; - - uvd_table = kzalloc(table_size, GFP_KERNEL); - if (NULL == uvd_table) + uvd_table = kzalloc(struct_size(uvd_table, entries, table->numEntries), + GFP_KERNEL); + if (!uvd_table) return -ENOMEM; uvd_table->count = table->numEntries; -- 2.27.0 _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
