[PATCH] Revert "drm/[radeon|amdgpu]: Replace one-element array and use struct_size() helper"

[Alex Deucher <alexdeucher@xxxxxxxxx>]

This reverts commit 4dea25853a6c0c16e373665153bd9eb6edc6319e.

This changes structs used by the hardware and breaks dpm on some cards.

Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
---
 drivers/gpu/drm/amd/amdgpu/si_dpm.c       | 5 +++--
 drivers/gpu/drm/amd/amdgpu/sislands_smc.h | 2 +-
 drivers/gpu/drm/radeon/si_dpm.c           | 5 +++--
 3 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/si_dpm.c b/drivers/gpu/drm/amd/amdgpu/si_dpm.c
index 0fc56c5bac08..c00ba4b23c9a 100644
--- a/drivers/gpu/drm/amd/amdgpu/si_dpm.c
+++ b/drivers/gpu/drm/amd/amdgpu/si_dpm.c
@@ -5715,9 +5715,10 @@ static int si_upload_sw_state(struct amdgpu_device *adev,
 	int ret;
 	u32 address = si_pi->state_table_start +
 		offsetof(SISLANDS_SMC_STATETABLE, driverState);
+	u32 state_size = sizeof(SISLANDS_SMC_SWSTATE) +
+		((new_state->performance_level_count - 1) *
+		 sizeof(SISLANDS_SMC_HW_PERFORMANCE_LEVEL));
 	SISLANDS_SMC_SWSTATE *smc_state = &si_pi->smc_statetable.driverState;
-	size_t state_size = struct_size(smc_state, levels,
-					new_state->performance_level_count);
 
 	memset(smc_state, 0, state_size);
 
diff --git a/drivers/gpu/drm/amd/amdgpu/sislands_smc.h b/drivers/gpu/drm/amd/amdgpu/sislands_smc.h
index a089dbf8f7a9..d2930eceaf3c 100644
--- a/drivers/gpu/drm/amd/amdgpu/sislands_smc.h
+++ b/drivers/gpu/drm/amd/amdgpu/sislands_smc.h
@@ -186,7 +186,7 @@ struct SISLANDS_SMC_SWSTATE
     uint8_t                             levelCount;
     uint8_t                             padding2;
     uint8_t                             padding3;
-    SISLANDS_SMC_HW_PERFORMANCE_LEVEL   levels[];
+    SISLANDS_SMC_HW_PERFORMANCE_LEVEL   levels[1];
 };
 
 typedef struct SISLANDS_SMC_SWSTATE SISLANDS_SMC_SWSTATE;
diff --git a/drivers/gpu/drm/radeon/si_dpm.c b/drivers/gpu/drm/radeon/si_dpm.c
index bab01ca864c6..a167e1c36d24 100644
--- a/drivers/gpu/drm/radeon/si_dpm.c
+++ b/drivers/gpu/drm/radeon/si_dpm.c
@@ -5253,9 +5253,10 @@ static int si_upload_sw_state(struct radeon_device *rdev,
 	int ret;
 	u32 address = si_pi->state_table_start +
 		offsetof(SISLANDS_SMC_STATETABLE, driverState);
+	u32 state_size = sizeof(SISLANDS_SMC_SWSTATE) +
+		((new_state->performance_level_count - 1) *
+		 sizeof(SISLANDS_SMC_HW_PERFORMANCE_LEVEL));
 	SISLANDS_SMC_SWSTATE *smc_state = &si_pi->smc_statetable.driverState;
-	size_t state_size = struct_size(smc_state, levels,
-					new_state->performance_level_count);
 
 	memset(smc_state, 0, state_size);
 
-- 
2.25.4

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