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From 7995b11e4c858d71cc003bfb61abf4341138100c Mon Sep 17 00:00:00 2001
From: Rex Zhu <Rex.Zhu@amd.com>
Date: Tue, 29 Dec 2015 13:56:03 +0800
Subject: [PATCH 0155/1110] 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>
---
drivers/gpu/drm/amd/powerplay/amd_powerplay.c | 15 ++++++++++++---
drivers/gpu/drm/amd/powerplay/inc/pp_instance.h | 3 +++
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 db0370b..2764bd3 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 7b60b61..4d8ed1f 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;
--
2.7.4
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