drm/i915: get/put runtime PM without holding rps.hw_lock

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>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index d90a707..92dd206 100644 (file)
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1468,7 +1468,7 @@ 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))) {
@@ -1476,12 +1476,13 @@ 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");
 
@@ -1498,10 +1499,11 @@ 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)