From: Chris Wilson Date: Wed, 15 Nov 2017 10:50:35 +0000 Subject: drm/i915/: Initialise trans_min for skl_compute_transition_wm() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Git-commit: be3fa66857051e2943960a06f8046e8445cdfe6e Patch-mainline: v4.17-rc1 References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166 clang spots drivers/gpu/drm/i915/intel_pm.c:4655:6: warning: variable 'trans_min' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized] if (INTEL_GEN(dev_priv) >= 10) but fortunately for us we skip the function unless on a gen10+ device. However, to keep the function generic in case we do want to re-enable it for gen9 again, initialise trans_min to 0. References: ca47667f523e ("drm/i915/gen10: Calculate and enable transition WM") Signed-off-by: Chris Wilson Cc: Mahesh Kumar Cc: Maarten Lankhorst Cc: Jani Nikula Cc: Joonas Lahtinen Cc: Rodrigo Vivi Cc: Ville Syrjälä Link: https://patchwork.freedesktop.org/patch/msgid/20171115105036.1094-3-chris@chris-wilson.co.uk Reviewed-by: Rodrigo Vivi Acked-by: Petr Tesarik --- drivers/gpu/drm/i915/intel_pm.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -4713,6 +4713,7 @@ static void skl_compute_transition_wm(st if (!dev_priv->ipc_enabled) goto exit; + trans_min = 0; if (INTEL_GEN(dev_priv) >= 10) trans_min = 4;