drm/amd/pm: drop unnecessary feature->mutex lock protections(V2)

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 cannot be in parallel
2. all other operations can be performed only after hardware
   setup complete.

V2: rich the commit log description

Signed-off-by: Evan Quan <evan.quan@amd.com>
Acked-by: Nirmoy Das <nirmoy.das@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
index bce723a..b98deca 100644 (file)
--- 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 f5aeb0b..48987f3 100644 (file)
--- 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;
 }