drm/i915: Silence GCC warning for cmn_a_well

Just make the logic simple enough for even GCC to understand (and
foolproof against random changes):

drivers/gpu/drm/i915/intel_runtime_pm.c: warning: 'cmn_a_well' may be
used uninitialized in this function [-Wuninitialized]:  => 871:23

Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1471284383-22324-1-git-send-email-chris@chris-wilson.co.uk
Reviewed-by: Imre Deak <imre.deak@intel.com>

diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index d659d6f..a1d73c2 100644 (file)
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -856,7 +856,7 @@ static void bxt_dpio_cmn_power_well_enable(struct drm_i915_private *dev_priv,
                                           struct i915_power_well *power_well)
 {
        enum skl_disp_power_wells power_well_id = power_well->data;
-       struct i915_power_well *cmn_a_well;
+       struct i915_power_well *cmn_a_well = NULL;
 
        if (power_well_id == BXT_DPIO_CMN_BC) {
                /*
@@ -869,7 +869,7 @@ static void bxt_dpio_cmn_power_well_enable(struct drm_i915_private *dev_priv,
 
        bxt_ddi_phy_init(dev_priv, bxt_power_well_to_phy(power_well));
 
-       if (power_well_id == BXT_DPIO_CMN_BC)
+       if (cmn_a_well)
                intel_power_well_put(dev_priv, cmn_a_well);
 }