diff options
author | Gustavo A. R. Silva <gustavoars@kernel.org> | 2020-10-07 19:07:38 +0300 |
---|---|---|
committer | Alex Deucher <alexander.deucher@amd.com> | 2020-10-09 21:43:30 +0300 |
commit | aa8d10a10fd78443a647983cc5e4c233bbe2c963 (patch) | |
tree | 0b3e38b58f05d847ea46acd1a10120e223037ea5 /drivers/gpu/drm/amd | |
parent | 637f7576ece1db9474a6d4700fdcef3c82ea87b5 (diff) | |
download | linux-aa8d10a10fd78443a647983cc5e4c233bbe2c963.tar.xz |
drm/amd/pm: Replace one-element array with flexible-array in struct phm_cac_leakage_table
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_cac_leakage_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->ucNumEntries by sizeof(struct phm_cac_leakage_table) when it
should have been multiplied it by sizeof(struct phm_cac_leakage_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@intel.com>
Link: https://lore.kernel.org/lkml/5f7c5d38.iT%2FQTjN+659XUDo5%25lkp@intel.com/
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd')
-rw-r--r-- | drivers/gpu/drm/amd/pm/inc/hwmgr.h | 2 | ||||
-rw-r--r-- | drivers/gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c | 13 |
2 files changed, 6 insertions, 9 deletions
diff --git a/drivers/gpu/drm/amd/pm/inc/hwmgr.h b/drivers/gpu/drm/amd/pm/inc/hwmgr.h index b8e33325fac6..7e0c948a7097 100644 --- a/drivers/gpu/drm/amd/pm/inc/hwmgr.h +++ b/drivers/gpu/drm/amd/pm/inc/hwmgr.h @@ -393,7 +393,7 @@ union phm_cac_leakage_record { struct phm_cac_leakage_table { uint32_t count; - union phm_cac_leakage_record entries[1]; + union phm_cac_leakage_record entries[]; }; struct phm_samu_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 7719f52e6d52..e059802d1e25 100644 --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c @@ -1384,17 +1384,14 @@ static int get_cac_leakage_table(struct pp_hwmgr *hwmgr, const ATOM_PPLIB_CAC_Leakage_Table *table) { struct phm_cac_leakage_table *cac_leakage_table; - unsigned long table_size, i; + unsigned long i; - if (hwmgr == NULL || table == NULL || ptable == NULL) + if (!hwmgr || !table || !ptable) return -EINVAL; - table_size = sizeof(ULONG) + - (sizeof(struct phm_cac_leakage_table) * table->ucNumEntries); - - cac_leakage_table = kzalloc(table_size, GFP_KERNEL); - - if (cac_leakage_table == NULL) + cac_leakage_table = kzalloc(struct_size(cac_leakage_table, entries, table->ucNumEntries), + GFP_KERNEL); + if (!cac_leakage_table) return -ENOMEM; cac_leakage_table->count = (ULONG)table->ucNumEntries; |