drm/amd/powerplay: add powerplay valid check to avoid null point. (v2)

In case CONFIG_DRM_AMD_POWERPLAY is defined and amdgpu.powerplay=0.
some functions in powrplay can also be called by DAL. and the input parameter is *adev.
if just check point not NULL was not enough and will lead to NULL point error.

V2: AGD: rebase on upstream

Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

2 files changed, 15 insertions, 3 deletions

diff --git a/drivers/gpu/drm/amd/powerplay/amd_powerplay.c b/drivers/gpu/drm/amd/powerplay/amd_powerplay.c
index db0370bd60e3..2764bd327034 100644
--- a/drivers/gpu/drm/amd/powerplay/amd_powerplay.c
+++ b/drivers/gpu/drm/amd/powerplay/amd_powerplay.c
@@ -30,6 +30,12 @@
 #include "power_state.h"
 #include "eventmanager.h"
 
+#define PP_CHECK(handle)                                                \
+        do {                                                            \
+                if ((handle) == NULL || (handle)->pp_valid != PP_VALID) \
+                        return -EINVAL;                                 \
+        } while (0)
+
 static int pp_early_init(void *handle)
 {
         return 0;
@@ -537,6 +543,8 @@ static int amd_pp_instance_init(struct amd_pp_init *pp_init,
         if (handle == NULL)
                 return -ENOMEM;
 
+        handle->pp_valid = PP_VALID;
+
         ret = smum_init(pp_init, handle);
         if (ret)
                 goto fail_smum;
@@ -611,8 +619,7 @@ int amd_powerplay_display_configuration_change(void *handle, const void *input)
         struct pp_hwmgr  *hwmgr;
         const struct amd_pp_display_configuration *display_config = input;
 
-        if (handle == NULL)
-                return -EINVAL;
+        PP_CHECK((struct pp_instance *)handle);
 
         hwmgr = ((struct pp_instance *)handle)->hwmgr;
 
@@ -625,7 +632,9 @@ int amd_powerplay_get_display_power_level(void *handle,
 {
         struct pp_hwmgr  *hwmgr;
 
-        if (handle == NULL || output == NULL)
+        PP_CHECK((struct pp_instance *)handle);
+
+        if (output == NULL)
                 return -EINVAL;
 
         hwmgr = ((struct pp_instance *)handle)->hwmgr;
diff --git a/drivers/gpu/drm/amd/powerplay/inc/pp_instance.h b/drivers/gpu/drm/amd/powerplay/inc/pp_instance.h
index 7b60b617dff6..4d8ed1f33de4 100644
--- a/drivers/gpu/drm/amd/powerplay/inc/pp_instance.h
+++ b/drivers/gpu/drm/amd/powerplay/inc/pp_instance.h
@@ -27,7 +27,10 @@
 #include "hwmgr.h"
 #include "eventmgr.h"
 
+#define PP_VALID  0x1F1F1F1F
+
 struct pp_instance {
+        uint32_t pp_valid;
         struct pp_smumgr *smu_mgr;
         struct pp_hwmgr *hwmgr;
         struct pp_eventmgr *eventmgr;