[PATCH v2] drm/xe/pt: Warn on 0 level before going to next lower level

[Nirmoy Das]

This should not happen so add a warn_on to be more paranoid.

v2: s/should/should not/

Cc: Matthew Auld <matthew.auld at intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Signed-off-by: Nirmoy Das <nirmoy.das at intel.com>
Reviewed-by: Matthew Auld <matthew.auld at intel.com>
---
 drivers/gpu/drm/xe/xe_pt.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_pt.c b/drivers/gpu/drm/xe/xe_pt.c
index 8d3922d2206e..d29c6ed0cbde 100644
--- a/drivers/gpu/drm/xe/xe_pt.c
+++ b/drivers/gpu/drm/xe/xe_pt.c
@@ -731,6 +731,7 @@ static int xe_pt_zap_ptes_entry(struct xe_ptw *parent, pgoff_t offset,
 	pgoff_t end_offset;
 
 	XE_WARN_ON(!*child);
+	XE_WARN_ON(!level);
 	XE_WARN_ON(!level && xe_child->is_compact);
 
 	/*
@@ -1396,6 +1397,7 @@ static int xe_pt_stage_unbind_entry(struct xe_ptw *parent, pgoff_t offset,
 	struct xe_pt *xe_child = container_of(*child, typeof(*xe_child), base);
 
 	XE_WARN_ON(!*child);
+	XE_WARN_ON(!level);
 	XE_WARN_ON(!level && xe_child->is_compact);
 
 	xe_pt_check_kill(addr, next, level - 1, xe_child, action, walk);
-- 
2.42.0