drm/amd/display: Fix potential memory leak in DMUB hw_init

[Why]
On resume we perform DMUB hw_init which allocates memory:
dm_resume->dm_dmub_hw_init->dc_dmub_srv_create->kzalloc
That results in memory leak in suspend/resume scenarios.

[How]
Allocate memory for the DC wrapper to DMUB only if it was not
allocated before.
No need to reallocate it on suspend/resume.

Signed-off-by: Lang Yu <Lang.Yu@amd.com>
Signed-off-by: Roman Li <roman.li@amd.com>
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 6d541de..9bca822 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -982,7 +982,8 @@ static int dm_dmub_hw_init(struct amdgpu_device *adev)
                abm->dmcu_is_running = dmcu->funcs->is_dmcu_initialized(dmcu);
        }
 
-       adev->dm.dc->ctx->dmub_srv = dc_dmub_srv_create(adev->dm.dc, dmub_srv);
+       if (!adev->dm.dc->ctx->dmub_srv)
+               adev->dm.dc->ctx->dmub_srv = dc_dmub_srv_create(adev->dm.dc, dmub_srv);
        if (!adev->dm.dc->ctx->dmub_srv) {
                DRM_ERROR("Couldn't allocate DC DMUB server!\n");
                return -ENOMEM;
@@ -2003,7 +2004,6 @@ static int dm_suspend(void *handle)
 
        amdgpu_dm_irq_suspend(adev);
 
-
        dc_set_power_state(dm->dc, DC_ACPI_CM_POWER_STATE_D3);
 
        return 0;