drm/i915/dpll: replace BUG_ON() with drm_WARN_ON()

Avoid BUG_ON(). Actually check the dpll count and bail out loudly with
drm_WARN_ON() from the loop before overflowing
i915->dpll.shared_dplls[].

v2: Rebase

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220830093411.1511040-2-jani.nikula@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
index 4c79e15..d437fcf 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
+++ b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
@@ -4199,6 +4199,10 @@ void intel_shared_dpll_init(struct drm_i915_private *dev_priv)
        dpll_info = dpll_mgr->dpll_info;
 
        for (i = 0; dpll_info[i].name; i++) {
+               if (drm_WARN_ON(&dev_priv->drm,
+                               i >= ARRAY_SIZE(dev_priv->display.dpll.shared_dplls)))
+                       break;
+
                drm_WARN_ON(&dev_priv->drm, i != dpll_info[i].id);
                dev_priv->display.dpll.shared_dplls[i].info = &dpll_info[i];
        }
@@ -4206,8 +4210,6 @@ void intel_shared_dpll_init(struct drm_i915_private *dev_priv)
        dev_priv->display.dpll.mgr = dpll_mgr;
        dev_priv->display.dpll.num_shared_dpll = i;
        mutex_init(&dev_priv->display.dpll.lock);
-
-       BUG_ON(dev_priv->display.dpll.num_shared_dpll > I915_NUM_PLLS);
 }
 
 /**