gpu: nvgpu: Replace kref for refcounting in nvgpu

- added wrapper struct nvgpu_ref over nvgpu_atomic_t
- added nvgpu_ref_* APIs to access the above struct

JIRA NVGPU-140

Change-Id: Id47f897995dd4721751f7610b6d4d4fbfe4d6b9a
Signed-off-by: Debarshi Dutta <ddutta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1540899
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: svccoveritychecker <svccoveritychecker@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/gpu/nvgpu/common/mm/vm.c b/drivers/gpu/nvgpu/common/mm/vm.c
index 3ed3c7fe..2e2f52df 100644
--- a/drivers/gpu/nvgpu/common/mm/vm.c
+++ b/drivers/gpu/nvgpu/common/mm/vm.c
@@ -404,7 +404,7 @@ static int __nvgpu_vm_init(struct mm_gk20a *mm,
         vm->mapped_buffers = NULL;
 
         nvgpu_mutex_init(&vm->update_gmmu_lock);
-        kref_init(&vm->ref);
+        nvgpu_ref_init(&vm->ref);
         nvgpu_init_list_node(&vm->vm_area_list);
 
         /*
@@ -557,7 +557,7 @@ static void __nvgpu_vm_remove(struct vm_gk20a *vm)
         nvgpu_kfree(g, vm);
 }
 
-static void __nvgpu_vm_remove_kref(struct kref *ref)
+static void __nvgpu_vm_remove_ref(struct nvgpu_ref *ref)
 {
         struct vm_gk20a *vm = container_of(ref, struct vm_gk20a, ref);
 
@@ -566,12 +566,12 @@ static void __nvgpu_vm_remove_kref(struct kref *ref)
 
 void nvgpu_vm_get(struct vm_gk20a *vm)
 {
-        kref_get(&vm->ref);
+        nvgpu_ref_get(&vm->ref);
 }
 
 void nvgpu_vm_put(struct vm_gk20a *vm)
 {
-        kref_put(&vm->ref, __nvgpu_vm_remove_kref);
+        nvgpu_ref_put(&vm->ref, __nvgpu_vm_remove_ref);
 }
 
 int nvgpu_insert_mapped_buf(struct vm_gk20a *vm,