[PATCH 3/4] drm/xe: Allow freeing of a managed bo

[John.C.Harrison at Intel.com]

From: John Harrison <John.C.Harrison at Intel.com>

If a bo is created via xe_managed_bo_create_pin_map() then it cannot be
freed by the driver using xe_bo_unpin_map_no_vm(), or indeed any other
existing function. The DRM layer will still have a pointer stashed
away for later freeing, causing a invalid memory access on driver
unload. So add a helper for releasing the DRM action as well.

Signed-off-by: John Harrison <John.C.Harrison at Intel.com>
---
 drivers/gpu/drm/xe/xe_bo.c | 5 +++++
 drivers/gpu/drm/xe/xe_bo.h | 1 +
 2 files changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_bo.c b/drivers/gpu/drm/xe/xe_bo.c
index ffca1cea5585..472cadcfc4dd 100644
--- a/drivers/gpu/drm/xe/xe_bo.c
+++ b/drivers/gpu/drm/xe/xe_bo.c
@@ -2222,6 +2222,11 @@ struct xe_bo *xe_managed_bo_create_pin_map(struct xe_device *xe, struct xe_tile
 	return bo;
 }
 
+void xe_managed_bo_unpin_map_no_vm(struct xe_device *xe, struct xe_bo *bo)
+{
+	devm_release_action(xe->drm.dev, __xe_bo_unpin_map_no_vm, bo);
+}
+
 struct xe_bo *xe_managed_bo_create_from_data(struct xe_device *xe, struct xe_tile *tile,
 					     const void *data, size_t size, u32 flags)
 {
diff --git a/drivers/gpu/drm/xe/xe_bo.h b/drivers/gpu/drm/xe/xe_bo.h
index 8cce413b5235..72f4348d0d52 100644
--- a/drivers/gpu/drm/xe/xe_bo.h
+++ b/drivers/gpu/drm/xe/xe_bo.h
@@ -122,6 +122,7 @@ struct xe_bo *xe_bo_create_pin_map_at_aligned(struct xe_device *xe,
 					      u64 alignment);
 struct xe_bo *xe_managed_bo_create_pin_map(struct xe_device *xe, struct xe_tile *tile,
 					   size_t size, u32 flags);
+void xe_managed_bo_unpin_map_no_vm(struct xe_device *xe, struct xe_bo *bo);
 struct xe_bo *xe_managed_bo_create_from_data(struct xe_device *xe, struct xe_tile *tile,
 					     const void *data, size_t size, u32 flags);
 int xe_managed_bo_reinit_in_vram(struct xe_device *xe, struct xe_tile *tile, struct xe_bo **src);
-- 
2.49.0