[PATCH 1/4] drm/amd/pm: drop unnecessary feature->mutex lock protections(V2)

[Evan Quan]

As these operations are performed in hardware setup and there
is actually no race conditions during this period considering:
1. the hardware setup is serial and cannnot be in parallel
2. all other operations can be performed only after hardware
   setup complete.

V2: rich the commit log description

Change-Id: I096d7ab0855ff59b0ecb56fd9d6d9946b3605fc8
Signed-off-by: Evan Quan <evan.quan at amd.com>
---
 drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c      | 4 ----
 drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c | 2 --
 2 files changed, 6 deletions(-)

diff --git a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
index 09dc5303762b..b7cad8ef6153 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
@@ -361,20 +361,16 @@ static int smu_get_driver_allowed_feature_mask(struct smu_context *smu)
 	int ret = 0;
 	uint32_t allowed_feature_mask[SMU_FEATURE_MAX/32];
 
-	mutex_lock(&feature->mutex);
 	bitmap_zero(feature->allowed, SMU_FEATURE_MAX);
-	mutex_unlock(&feature->mutex);
 
 	ret = smu_get_allowed_feature_mask(smu, allowed_feature_mask,
 					     SMU_FEATURE_MAX/32);
 	if (ret)
 		return ret;
 
-	mutex_lock(&feature->mutex);
 	bitmap_or(feature->allowed, feature->allowed,
 		      (unsigned long *)allowed_feature_mask,
 		      feature->feature_num);
-	mutex_unlock(&feature->mutex);
 
 	return ret;
 }
diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c b/drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c
index 548db1edd352..28a19ffd22a1 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c
@@ -721,7 +721,6 @@ int smu_v11_0_set_allowed_mask(struct smu_context *smu)
 	int ret = 0;
 	uint32_t feature_mask[2];
 
-	mutex_lock(&feature->mutex);
 	if (bitmap_empty(feature->allowed, SMU_FEATURE_MAX) || feature->feature_num < 64)
 		goto failed;
 
@@ -738,7 +737,6 @@ int smu_v11_0_set_allowed_mask(struct smu_context *smu)
 		goto failed;
 
 failed:
-	mutex_unlock(&feature->mutex);
 	return ret;
 }
 
-- 
2.28.0