On Thu, 2013-12-19 at 11:54 -0200, Paulo Zanoni wrote:
> From: Paulo Zanoni <paulo.r.zanoni@intel.com>
> 
> We'll need this when we merge PC8 and Runtime PM: the PC8
> enable/disable functions need that lock.
> 
> Also, it's good practice to not hold a lock for longer than strictly
> needed.
> 
> Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>

Reviewed-by: Imre Deak <imre.deak@intel.com>

> ---
>  drivers/gpu/drm/i915/i915_debugfs.c | 12 +++++++-----
>  1 file changed, 7 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index 430eb3e..1cdc5dd 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -1414,7 +1414,7 @@ static int i915_ring_freq_table(struct seq_file *m, void *unused)
>  	struct drm_info_node *node = (struct drm_info_node *) m->private;
>  	struct drm_device *dev = node->minor->dev;
>  	drm_i915_private_t *dev_priv = dev->dev_private;
> -	int ret;
> +	int ret = 0;
>  	int gpu_freq, ia_freq;
>  
>  	if (!(IS_GEN6(dev) || IS_GEN7(dev))) {
> @@ -1422,12 +1422,13 @@ static int i915_ring_freq_table(struct seq_file *m, void *unused)
>  		return 0;
>  	}
>  
> +	intel_runtime_pm_get(dev_priv);
> +
>  	flush_delayed_work(&dev_priv->rps.delayed_resume_work);
>  
>  	ret = mutex_lock_interruptible(&dev_priv->rps.hw_lock);
>  	if (ret)
> -		return ret;
> -	intel_runtime_pm_get(dev_priv);
> +		goto out;
>  
>  	seq_puts(m, "GPU freq (MHz)\tEffective CPU freq (MHz)\tEffective Ring freq (MHz)\n");
>  
> @@ -1444,10 +1445,11 @@ static int i915_ring_freq_table(struct seq_file *m, void *unused)
>  			   ((ia_freq >> 8) & 0xff) * 100);
>  	}
>  
> -	intel_runtime_pm_put(dev_priv);
>  	mutex_unlock(&dev_priv->rps.hw_lock);
>  
> -	return 0;
> +out:
> +	intel_runtime_pm_put(dev_priv);
> +	return ret;
>  }
>  
>  static int i915_gfxec(struct seq_file *m, void *unused)