[PATCH v3 12/12] drm/amdgpu: Fix a bunch of sdma code crash post device unplug

[Andrey Grodzovsky <andrey.grodzovsky@amd.com>]

We can't allocate and submit IBs post device unplug.

Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index fdbe7d4..a62ad20 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -31,6 +31,7 @@
 #include <linux/dma-buf.h>
 
 #include <drm/amdgpu_drm.h>
+#include <drm/drm_drv.h>
 #include "amdgpu.h"
 #include "amdgpu_trace.h"
 #include "amdgpu_amdkfd.h"
@@ -1602,7 +1603,10 @@ static int amdgpu_vm_bo_update_mapping(struct amdgpu_device *adev,
 	struct amdgpu_vm_update_params params;
 	enum amdgpu_sync_mode sync_mode;
 	uint64_t pfn;
-	int r;
+	int r, idx;
+
+	if (!drm_dev_enter(&adev->ddev, &idx))
+		return -ENOENT;
 
 	memset(&params, 0, sizeof(params));
 	params.adev = adev;
@@ -1645,6 +1649,8 @@ static int amdgpu_vm_bo_update_mapping(struct amdgpu_device *adev,
 	if (r)
 		goto error_unlock;
 
+
+	drm_dev_exit(idx);
 	do {
 		uint64_t tmp, num_entries, addr;
 
-- 
2.7.4

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