[PATCH 1/4] drm/i915: Do not define vma on stack

[Matthew Brost]

From: Venkata Sandeep Dhanalakota <venkata.s.dhanalak...@intel.com>

Defining vma on stack can cause stack overflow, if
vma gets populated with new fields.

Cc: Daniele Ceraolo Spurio <daniele.ceraolospu...@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursu...@intel.com>
Signed-off-by: Venkata Sandeep Dhanalakota <venkata.s.dhanalak...@intel.com>
Signef-off-by: Matthew Brost <matthew.br...@intel.com>
---
 drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c | 18 +++++++++---------
 drivers/gpu/drm/i915/gt/uc/intel_uc_fw.h |  2 ++
 2 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c 
b/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
index 3a16d08608a5..f632dbd32b42 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
@@ -413,20 +413,20 @@ static void uc_fw_bind_ggtt(struct intel_uc_fw *uc_fw)
 {
        struct drm_i915_gem_object *obj = uc_fw->obj;
        struct i915_ggtt *ggtt = __uc_fw_to_gt(uc_fw)->ggtt;
-       struct i915_vma dummy = {
-               .node.start = uc_fw_ggtt_offset(uc_fw),
-               .node.size = obj->base.size,
-               .pages = obj->mm.pages,
-               .vm = &ggtt->vm,
-       };
+       struct i915_vma *dummy = &uc_fw->dummy;
+
+       dummy->node.start = uc_fw_ggtt_offset(uc_fw);
+       dummy->node.size = obj->base.size;
+       dummy->pages = obj->mm.pages;
+       dummy->vm = &ggtt->vm;
 
        GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj));
-       GEM_BUG_ON(dummy.node.size > ggtt->uc_fw.size);
+       GEM_BUG_ON(dummy->node.size > ggtt->uc_fw.size);
 
        /* uc_fw->obj cache domains were not controlled across suspend */
-       drm_clflush_sg(dummy.pages);
+       drm_clflush_sg(dummy->pages);
 
-       ggtt->vm.insert_entries(&ggtt->vm, &dummy, I915_CACHE_NONE, 0);
+       ggtt->vm.insert_entries(&ggtt->vm, dummy, I915_CACHE_NONE, 0);
 }
 
 static void uc_fw_unbind_ggtt(struct intel_uc_fw *uc_fw)
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.h 
b/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.h
index 99bb1fe1af66..693cc0ebcd63 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.h
@@ -10,6 +10,7 @@
 #include "intel_uc_fw_abi.h"
 #include "intel_device_info.h"
 #include "i915_gem.h"
+#include "i915_vma.h"
 
 struct drm_printer;
 struct drm_i915_private;
@@ -75,6 +76,7 @@ struct intel_uc_fw {
        bool user_overridden;
        size_t size;
        struct drm_i915_gem_object *obj;
+       struct i915_vma dummy;
 
        /*
         * The firmware build process will generate a version header file with 
major and
-- 
2.28.0