turnip/pipeline: Don't assume tu_shader is a valid object

Fixes a crash in tu6_emit_fs_config() when 'shader' argument is
assumed to be non-null, which is possible.

Fixes dEQP test:

dEQP-VK.api.descriptor_set.descriptor_set_layout_lifetime.graphics

Reviewed-by: Jonathan Marek <jonathan@marek.ca>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3756>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3756>

diff --git a/src/freedreno/vulkan/tu_pipeline.c b/src/freedreno/vulkan/tu_pipeline.c
index 5519cfe7139b3c9f927374fabbdc668546851931..3d7278a4c897820ee2fe5467764f55aa4a39673d 100644 (file)
--- a/src/freedreno/vulkan/tu_pipeline.c
+++ b/src/freedreno/vulkan/tu_pipeline.c
@@ -468,9 +468,15 @@ tu6_emit_fs_config(struct tu_cs *cs, struct tu_shader *shader,
    if (fs->need_fine_derivatives)
       sp_fs_ctrl |= A6XX_SP_FS_CTRL_REG0_DIFF_FINE;
 
-   uint32_t sp_fs_config = A6XX_SP_FS_CONFIG_NTEX(shader->texture_map.num_desc) |
-                           A6XX_SP_FS_CONFIG_NSAMP(shader->sampler_map.num_desc) |
-                           A6XX_SP_FS_CONFIG_NIBO(tu_shader_nibo(shader));
+   uint32_t sp_fs_config = 0;
+   unsigned shader_nibo = 0;
+   if (shader) {
+      shader_nibo = tu_shader_nibo(shader);
+      sp_fs_config = A6XX_SP_FS_CONFIG_NTEX(shader->texture_map.num_desc) |
+                     A6XX_SP_FS_CONFIG_NSAMP(shader->sampler_map.num_desc) |
+                     A6XX_SP_FS_CONFIG_NIBO(shader_nibo);
+   }
+
    if (fs->instrlen)
       sp_fs_config |= A6XX_SP_FS_CONFIG_ENABLED;
 
@@ -492,7 +498,7 @@ tu6_emit_fs_config(struct tu_cs *cs, struct tu_shader *shader,
                   A6XX_HLSQ_FS_CNTL_ENABLED);
 
    tu_cs_emit_pkt4(cs, REG_A6XX_SP_IBO_COUNT, 1);
-   tu_cs_emit(cs, tu_shader_nibo(shader));
+   tu_cs_emit(cs, shader_nibo);
 }
 
 static void