iris/bufmgr: Check if iris_bo_gem_mmap failed

After refactoring of iris_bo_map_cpu and iris_bo_map_wc - immediate
return of NULL on failure to mmap a buffer was lost.

Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/2855
Fixes: 5bc3f52dd8c2b5acaae959ccae2e1fb7c769bb22
Signed-off-by: Danylo Piliaiev <danylo.piliaiev@globallogic.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4786>

diff --git a/src/gallium/drivers/iris/iris_bufmgr.c b/src/gallium/drivers/iris/iris_bufmgr.c
index 5bf52b3..c8e6d0c 100644 (file)
--- a/src/gallium/drivers/iris/iris_bufmgr.c
+++ b/src/gallium/drivers/iris/iris_bufmgr.c
@@ -980,6 +980,10 @@ iris_bo_map_cpu(struct pipe_debug_callback *dbg,
    if (!bo->map_cpu) {
       DBG("iris_bo_map_cpu: %d (%s)\n", bo->gem_handle, bo->name);
       void *map = iris_bo_gem_mmap(dbg, bo, false);
+      if (!map) {
+         return NULL;
+      }
+
       VG_DEFINED(map, bo->size);
 
       if (p_atomic_cmpxchg(&bo->map_cpu, NULL, map)) {
@@ -1027,6 +1031,10 @@ iris_bo_map_wc(struct pipe_debug_callback *dbg,
    if (!bo->map_wc) {
       DBG("iris_bo_map_wc: %d (%s)\n", bo->gem_handle, bo->name);
       void *map = iris_bo_gem_mmap(dbg, bo, true);
+      if (!map) {
+         return NULL;
+      }
+
       VG_DEFINED(map, bo->size);
 
       if (p_atomic_cmpxchg(&bo->map_wc, NULL, map)) {