[Intel-gfx] [PATCH 1/2] drm/i915: Fix oops due to missing stack depot

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

We call __save_depot_stack() unconditionally so the stack depot
must always be initialized or else we'll oops on platforms without
runtime pm support.

Presumably we've not seen this in CI due to stack_depot_init()
already getting called via drm_mm_init()+CONFIG_DRM_DEBUG_MM.

Cc: Vlastimil Babka <vbabka at suse.cz>
Cc: Dmitry Vyukov <dvyukov at google.com>
Cc: Marco Elver <elver at google.com> # stackdepot
Cc: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Imre Deak <imre.deak at intel.com>
Fixes: 2dba5eb1c73b ("lib/stackdepot: allow optional init and stack_table allocation by kvmalloc()")
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_runtime_pm.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index 53f1ccb78849..64c2708efc9e 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -68,9 +68,7 @@ static noinline depot_stack_handle_t __save_depot_stack(void)
 static void init_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm)
 {
 	spin_lock_init(&rpm->debug.lock);
-
-	if (rpm->available)
-		stack_depot_init();
+	stack_depot_init();
 }
 
 static noinline depot_stack_handle_t
-- 
2.34.1