[PATCH] drm/amdgpu: Add null pointer check before task_info get and put

[Lu Yao]

This patch add null pointer check for amdgpu_vm_put_task_info and
amdgpu_vm_get_task_info_vm, because there is only a warning if create
task_info failed in amdgpu_vm_init.

Fixes: b8f67b9ddf4f ("drm/amdgpu: change vm->task_info handling")
Signed-off-by: Lu Yao <ya...@kylinos.cn>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index c9c48b782ec1..65edd74bd944 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -2336,7 +2336,8 @@ amdgpu_vm_get_vm_from_pasid(struct amdgpu_device *adev, u32 pasid)
*/
void amdgpu_vm_put_task_info(struct amdgpu_task_info *task_info)
{
- kref_put(&task_info->refcount, amdgpu_vm_destroy_task_info);
+ if (task_info)
+ kref_put(&task_info->refcount, amdgpu_vm_destroy_task_info);
}

/**
@@ -2352,7 +2353,7 @@ amdgpu_vm_get_task_info_vm(struct amdgpu_vm *vm)
{
struct amdgpu_task_info *ti = NULL;

- if (vm) {
+ if (vm && vm->task_info) {
ti = vm->task_info;
kref_get(&vm->task_info->refcount);
}
--
2.25.1