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
