On Thu, 2016-02-25 at 21:10 +0000, Chris Wilson wrote:
> commit 09731280028ce03e6a27e1998137f1775a2839f3
> Author: Imre Deak <imre.d...@intel.com>
> Date: Wed Feb 17 14:17:42 2016 +0200
>
> drm/i915: Add helper to get a display power ref if it was already
> enabled
>
> left the rpm wakelock assertions unbalanced if CONFIG_PM was disabled
> as
> intel_runtime_pm_get_if_in_use() would return true without
> incrementing
> the local bookkeeping required for the assertions.
>
> Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
> CC: Mika Kuoppala <mika.kuopp...@intel.com>
> CC: Joonas Lahtinen <joonas.lahti...@linux.intel.com>
> CC: Ville Syrjälä <ville.syrj...@linux.intel.com>
> Cc: Imre Deak <imre.d...@intel.com>
Arg, I broke this in v3. Thanks for catching it:
Reviewed-by: Imre Deak <imre.d...@intel.com>
> ---
> drivers/gpu/drm/i915/intel_runtime_pm.c | 26 ++++++++++++-----------
> ---
> 1 file changed, 12 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c
> b/drivers/gpu/drm/i915/intel_runtime_pm.c
> index e2329768902c..4172e73212cd 100644
> --- a/drivers/gpu/drm/i915/intel_runtime_pm.c
> +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
> @@ -2365,22 +2365,20 @@ bool intel_runtime_pm_get_if_in_use(struct
> drm_i915_private *dev_priv)
> {
> struct drm_device *dev = dev_priv->dev;
> struct device *device = &dev->pdev->dev;
> - int ret;
>
> - if (!IS_ENABLED(CONFIG_PM))
> - return true;
> + if (IS_ENABLED(CONFIG_PM)) {
> + int ret = pm_runtime_get_if_in_use(device);
>
> - ret = pm_runtime_get_if_in_use(device);
> -
> - /*
> - * In cases runtime PM is disabled by the RPM core and we
> get an
> - * -EINVAL return value we are not supposed to call this
> function,
> - * since the power state is undefined. This applies atm to
> the
> - * late/early system suspend/resume handlers.
> - */
> - WARN_ON_ONCE(ret < 0);
> - if (ret <= 0)
> - return false;
> + /*
> + * In cases runtime PM is disabled by the RPM core
> and we get
> + * an -EINVAL return value we are not supposed to
> call this
> + * function, since the power state is undefined.
> This applies
> + * atm to the late/early system suspend/resume
> handlers.
> + */
> + WARN_ON_ONCE(ret < 0);
> + if (ret <= 0)
> + return false;
> + }
>
> atomic_inc(&dev_priv->pm.wakeref_count);
> assert_rpm_wakelock_held(dev_priv);
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