Mesa (master): broadcom/vc4: Fix double-unrefcounting of prsc->next with shadows.

[Eric Anholt]

Module: Mesa
Branch: master
Commit: c824a045ea639b8a93cbc2518b16900402d9150f
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=c824a045ea639b8a93cbc2518b16900402d9150f

Author: Eric Anholt <eric at anholt.net>
Date:   Tue Feb 20 16:28:07 2018 +0000

broadcom/vc4: Fix double-unrefcounting of prsc->next with shadows.

When we set up the shadow resource we were copying the original resource
as the template, including its prsc->next field.  When we shadowed the
first YUV plane's resource for linear-to-tiled conversion, we would end up
unbalancing the refcount on the shadow resource's destruction.

---

 src/gallium/drivers/vc4/vc4_state.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/src/gallium/drivers/vc4/vc4_state.c b/src/gallium/drivers/vc4/vc4_state.c
index b4696ed798..7bc87b0c4e 100644
--- a/src/gallium/drivers/vc4/vc4_state.c
+++ b/src/gallium/drivers/vc4/vc4_state.c
@@ -583,12 +583,17 @@ vc4_create_sampler_view(struct pipe_context *pctx, struct pipe_resource *prsc,
              (cso->u.tex.first_level != cso->u.tex.last_level)) ||
             rsc->vc4_format == VC4_TEXTURE_TYPE_RGBA32R) {
                 struct vc4_resource *shadow_parent = rsc;
-                struct pipe_resource tmpl = *prsc;
-
-                tmpl.bind = PIPE_BIND_SAMPLER_VIEW | PIPE_BIND_RENDER_TARGET;
-                tmpl.width0 = u_minify(tmpl.width0, cso->u.tex.first_level);
-                tmpl.height0 = u_minify(tmpl.height0, cso->u.tex.first_level);
-                tmpl.last_level = cso->u.tex.last_level - cso->u.tex.first_level;
+                struct pipe_resource tmpl = {
+                        .target = prsc->target,
+                        .format = prsc->format,
+                        .width0 = u_minify(prsc->width0,
+                                           cso->u.tex.first_level),
+                        .height0 = u_minify(prsc->height0,
+                                            cso->u.tex.first_level),
+                        .bind = PIPE_BIND_SAMPLER_VIEW | PIPE_BIND_RENDER_TARGET,
+                        .last_level = cso->u.tex.last_level - cso->u.tex.first_level,
+                        .nr_samples = prsc->nr_samples,
+                };
 
                 /* Create the shadow texture.  The rest of the texture
                  * parameter setup will use the shadow.