[Mesa-dev] [PATCH] Revert "glsl: don't reference shader prog data during cache fallback"

[Nicolai Hähnle]

From: Nicolai Hähnle <nicolai.haehnle at amd.com>

This reverts commit 0e9991f957e296f46cfff40a94ffba0adf2a58e1.

At least when we fallback because of TGSI, the gl_program objects are
re-allocated, and we don't in fact already have a reference to the
gl_shader_program_data.

This fixes a crash that can be reproduced as follows:

1. Run any GL program with MESA_GLSL=cache_info.
2. Note the SHA of some tgsi_tokens.
3. Remove the corresponding file from ~/.cache/mesa and re-run.

Cc: 17.1 <mesa-stable at lists.freedesktop.org>
---
 src/compiler/glsl/linker.cpp | 3 +--
 src/mesa/main/shaderobj.c    | 3 +--
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/src/compiler/glsl/linker.cpp b/src/compiler/glsl/linker.cpp
index 2e7dd2b..4776d09 100644
--- a/src/compiler/glsl/linker.cpp
+++ b/src/compiler/glsl/linker.cpp
@@ -2243,22 +2243,21 @@ link_intrastage_shaders(void *mem_ctx,
    struct gl_program *gl_prog =
       ctx->Driver.NewProgram(ctx,
                              _mesa_shader_stage_to_program(shader_list[0]->Stage),
                              prog->Name, false);
    if (!gl_prog) {
       prog->data->LinkStatus = linking_failure;
       _mesa_delete_linked_shader(ctx, linked);
       return NULL;
    }
 
-   if (!prog->data->cache_fallback)
-      _mesa_reference_shader_program_data(ctx, &gl_prog->sh.data, prog->data);
+   _mesa_reference_shader_program_data(ctx, &gl_prog->sh.data, prog->data);
 
    /* Don't use _mesa_reference_program() just take ownership */
    linked->Program = gl_prog;
 
    linked->ir = new(linked) exec_list;
    clone_ir_list(mem_ctx, linked->ir, main->ir);
 
    link_fs_inout_layout_qualifiers(prog, linked, shader_list, num_shaders);
    link_tcs_out_layout_qualifiers(prog, gl_prog, shader_list, num_shaders);
    link_tes_in_layout_qualifiers(prog, gl_prog, shader_list, num_shaders);
diff --git a/src/mesa/main/shaderobj.c b/src/mesa/main/shaderobj.c
index 8a5fa5e..f6f7bf5 100644
--- a/src/mesa/main/shaderobj.c
+++ b/src/mesa/main/shaderobj.c
@@ -427,22 +427,21 @@ _mesa_free_shader_program_data(struct gl_context *ctx,
 
 
 /**
  * Free/delete a shader program object.
  */
 void
 _mesa_delete_shader_program(struct gl_context *ctx,
                             struct gl_shader_program *shProg)
 {
    _mesa_free_shader_program_data(ctx, shProg);
-   if (!shProg->data->cache_fallback)
-      _mesa_reference_shader_program_data(ctx, &shProg->data, NULL);
+   _mesa_reference_shader_program_data(ctx, &shProg->data, NULL);
    ralloc_free(shProg);
 }
 
 
 /**
  * Lookup a GLSL program object.
  */
 struct gl_shader_program *
 _mesa_lookup_shader_program(struct gl_context *ctx, GLuint name)
 {
-- 
2.9.3