[patch] drm/i915: unlock on error in i915_ppgtt_info()

[Dan Carpenter]

We need to call intel_runtime_pm_put() and mutex_unlock() before
returning.

Fixes: 7cb5dff8d59d ('drm/i915: fix task reference leak in i915_debugfs.c')
Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c 
b/drivers/gpu/drm/i915/i915_debugfs.c
index afa7982..dcc50f3 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2294,18 +2294,21 @@ static int i915_ppgtt_info(struct seq_file *m, void 
*data)
                struct task_struct *task;

                task = get_pid_task(file->pid, PIDTYPE_PID);
-               if (!task)
-                       return -ESRCH;
+               if (!task) {
+                       ret = -ESRCH;
+                       goto out_put;
+               }
                seq_printf(m, "\nproc: %s\n", task->comm);
                put_task_struct(task);
                idr_for_each(&file_priv->context_idr, per_file_ctx,
                             (void *)(unsigned long)m);
        }

+out_put:
        intel_runtime_pm_put(dev_priv);
        mutex_unlock(&dev->struct_mutex);

-       return 0;
+       return ret;
 }

 static int count_irq_waiters(struct drm_i915_private *i915)