1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/mm_gk20a.c b/drivers/gpu/nvgpu/gk20a/mm_gk20a.c
index 2e26ff44..b0c864d4 100644
--- a/drivers/gpu/nvgpu/gk20a/mm_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/mm_gk20a.c
@@ -873,6 +873,12 @@ static void gk20a_vm_unmap_user(struct vm_gk20a *vm, u64 offset,
                 mutex_lock(&vm->update_gmmu_lock);
         }
 
+        if (mapped_buffer->user_mapped == 0) {
+                mutex_unlock(&vm->update_gmmu_lock);
+                gk20a_err(d, "addr already unmapped from user 0x%llx", offset);
+                return;
+        }
+
         mapped_buffer->user_mapped--;
         if (mapped_buffer->user_mapped == 0)
                 vm->num_user_mapped_buffers--;