From: Gustavo A. R. Silva Date: Wed, 7 Oct 2020 16:06:14 +0000 (-0500) Subject: drm/amd/pm: Replace one-element array with flexible-array in struct phm_phase_sheddin... X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=9526e431c5260eeebfa575ff38f2d5cd6077f8f9;p=linux.git drm/amd/pm: Replace one-element array with flexible-array in struct phm_phase_shedding_limits_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_phase_shedding_limits_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 ptable->ucNumEntries by sizeof(struct phm_phase_shedding_limits_table) when it should have multiplied it by sizeof(struct phm_phase_shedding_limits_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 Link: https://lore.kernel.org/lkml/5f7c5d36.6PStUZp2HRxAz7IM%25lkp@intel.com/ Acked-by: Christian König Signed-off-by: Gustavo A. R. Silva Signed-off-by: Alex Deucher --- diff --git a/drivers/gpu/drm/amd/pm/inc/hwmgr.h b/drivers/gpu/drm/amd/pm/inc/hwmgr.h index 361cb11253517..ad614e32079e3 100644 --- a/drivers/gpu/drm/amd/pm/inc/hwmgr.h +++ b/drivers/gpu/drm/amd/pm/inc/hwmgr.h @@ -161,7 +161,7 @@ struct phm_vce_clock_voltage_dependency_record { struct phm_phase_shedding_limits_table { uint32_t count; - struct phm_phase_shedding_limits_record entries[1]; + struct phm_phase_shedding_limits_record entries[]; }; struct phm_vceclock_voltage_dependency_table { diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c index a1b1980459788..b2ef76580c6aa 100644 --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/processpptables.c @@ -1530,16 +1530,12 @@ static int init_phase_shedding_table(struct pp_hwmgr *hwmgr, (((unsigned long)powerplay_table4) + le16_to_cpu(powerplay_table4->usVddcPhaseShedLimitsTableOffset)); struct phm_phase_shedding_limits_table *table; - unsigned long size, i; + unsigned long i; - size = sizeof(unsigned long) + - (sizeof(struct phm_phase_shedding_limits_table) * - ptable->ucNumEntries); - - table = kzalloc(size, GFP_KERNEL); - - if (table == NULL) + table = kzalloc(struct_size(table, entries, ptable->ucNumEntries), + GFP_KERNEL); + if (!table) return -ENOMEM; table->count = (unsigned long)ptable->ucNumEntries;