[PATCH] drm/amd/powerplay: add smu message mutex

[Xiao, Jack]

Add smu message mutex preventing against race condition issue.

Signed-off-by: Jack Xiao <Jack.Xiao at amd.com>
---
 drivers/gpu/drm/amd/powerplay/inc/amdgpu_smu.h | 1 +
 drivers/gpu/drm/amd/powerplay/smu_v11_0.c      | 7 ++++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/powerplay/inc/amdgpu_smu.h b/drivers/gpu/drm/amd/powerplay/inc/amdgpu_smu.h
index 3eb1de9..735233e 100644
--- a/drivers/gpu/drm/amd/powerplay/inc/amdgpu_smu.h
+++ b/drivers/gpu/drm/amd/powerplay/inc/amdgpu_smu.h
@@ -374,6 +374,7 @@ struct smu_context
 	const struct smu_funcs		*funcs;
 	const struct pptable_funcs	*ppt_funcs;
 	struct mutex			mutex;
+	struct mutex			msg_mutex;
 	uint64_t pool_size;
 
 	struct smu_table_context	smu_table;
diff --git a/drivers/gpu/drm/amd/powerplay/smu_v11_0.c b/drivers/gpu/drm/amd/powerplay/smu_v11_0.c
index d2eeb62..de737a0 100644
--- a/drivers/gpu/drm/amd/powerplay/smu_v11_0.c
+++ b/drivers/gpu/drm/amd/powerplay/smu_v11_0.c
@@ -104,6 +104,8 @@ static int smu_v11_0_send_msg(struct smu_context *smu, uint16_t msg)
 	if (index < 0)
 		return index;
 
+	mutex_lock(&smu->msg_mutex);
+
 	smu_v11_0_wait_for_response(smu);
 
 	WREG32_SOC15(MP1, 0, mmMP1_SMN_C2PMSG_90, 0);
@@ -111,11 +113,11 @@ static int smu_v11_0_send_msg(struct smu_context *smu, uint16_t msg)
 	smu_v11_0_send_msg_without_waiting(smu, (uint16_t)index);
 
 	ret = smu_v11_0_wait_for_response(smu);
-
 	if (ret)
 		pr_err("Failed to send message 0x%x, response 0x%x\n", index,
 		       ret);
 
+	mutex_unlock(&smu->msg_mutex);
 	return ret;
 
 }
@@ -132,6 +134,8 @@ static int smu_v11_0_send_msg(struct smu_context *smu, uint16_t msg)
 	if (index < 0)
 		return index;
 
+	mutex_lock(&smu->msg_mutex);
+
 	ret = smu_v11_0_wait_for_response(smu);
 	if (ret)
 		pr_err("Failed to send message 0x%x, response 0x%x, param 0x%x\n",
@@ -148,6 +152,7 @@ static int smu_v11_0_send_msg(struct smu_context *smu, uint16_t msg)
 		pr_err("Failed to send message 0x%x, response 0x%x param 0x%x\n",
 		       index, ret, param);
 
+	mutex_unlock(&smu->msg_mutex);
 	return ret;
 }
 
-- 
1.9.1