drm/vmwgfx: Don't refcount cotable lookups during command buffer validation

The typical pattern of these lookups are
-Lookup
-Put on validate list if not already there.
-Unreference
And since we are the exclusive user of the context during lookup time,
we can be sure that the resource will stay alive during the sequence.
So avoid taking a reference during lookup, and also avoid unreferencing
when done. There are two users outside of command buffer validation and
those are refcounted explicitly.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_shader.c b/drivers/gpu/drm/vmwgfx/vmwgfx_shader.c
index 6915c8258e6b..bf32fe446219 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_shader.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_shader.c
@@ -636,7 +636,8 @@ int vmw_dx_shader_add(struct vmw_cmdbuf_res_manager *man,
 
         res = &shader->res;
         shader->ctx = ctx;
-        shader->cotable = vmw_context_cotable(ctx, SVGA_COTABLE_DXSHADER);
+        shader->cotable = vmw_resource_reference
+                (vmw_context_cotable(ctx, SVGA_COTABLE_DXSHADER));
         shader->id = user_key;
         shader->committed = false;
         INIT_LIST_HEAD(&shader->cotable_head);