[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.q...@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

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