[bug report] mt76: mt7615: wake device before accessing regmap in debugfs

[<dan.carpenter@oracle.com>]

Hello Lorenzo Bianconi,

The patch ea4906c4be49: "mt76: mt7615: wake device before accessing
regmap in debugfs" from Jul 3, 2020, leads to the following static
checker warning:

	drivers/net/wireless/mediatek/mt76/mt7615/debugfs.c:179 mt7615_reset_test_set()
	warn: inconsistent returns 'dev->mt76.mutex'.

drivers/net/wireless/mediatek/mt76/mt7615/debugfs.c
   159  static int
   160  mt7615_reset_test_set(void *data, u64 val)
   161  {
   162          struct mt7615_dev *dev = data;
   163          struct sk_buff *skb;
   164  
   165          if (!mt7615_wait_for_mcu_init(dev))
   166                  return 0;
   167  
   168          mt7615_mutex_acquire(dev);
   169  
   170          skb = alloc_skb(1, GFP_KERNEL);
   171          if (!skb)
   172                  return -ENOMEM;
                        ^^^^^^^^^^^^^^
This is returning with the mutex held.  What is the mutex protecting?
We could move the allocation and the skb_put() before the
mt7615_mutex_acquire().

   173  
   174          skb_put(skb, 1);
   175          mt76_tx_queue_skb_raw(dev, 0, skb, 0);
   176  
   177          mt7615_mutex_release(dev);
   178  
   179          return 0;
   180  }

regards,
dan carpenter

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