drm/i915: Hold pc8 lock around toggling pc8.gpu_idle

[firefly-linux-kernel-4.4.55.git] / drivers / gpu / drm / i915 / intel_display.c

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index de6edd0f6205d9298980fb67e7398813843a3864..0b77916e7ea64ffc1adbb4f4cf2346c3357227bb 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6585,18 +6585,22 @@ done:
 
 static void hsw_package_c8_gpu_idle(struct drm_i915_private *dev_priv)
 {
+       mutex_lock(&dev_priv->pc8.lock);
        if (!dev_priv->pc8.gpu_idle) {
                dev_priv->pc8.gpu_idle = true;
-               hsw_enable_package_c8(dev_priv);
+               __hsw_enable_package_c8(dev_priv);
        }
+       mutex_unlock(&dev_priv->pc8.lock);
 }
 
 static void hsw_package_c8_gpu_busy(struct drm_i915_private *dev_priv)
 {
+       mutex_lock(&dev_priv->pc8.lock);
        if (dev_priv->pc8.gpu_idle) {
                dev_priv->pc8.gpu_idle = false;
-               hsw_disable_package_c8(dev_priv);
+               __hsw_disable_package_c8(dev_priv);
        }
+       mutex_unlock(&dev_priv->pc8.lock);
 }
 
 #define for_each_power_domain(domain, mask)                            \