[lvc-project] [PATCH 5.10 1/1] mt76: fix mt7615_init_tx_queues() return value

[Жандарович Никита Игоревич]

> > > What is the "fault"?
> >
> > In 5.10.y "mt7615_init_tx_queues() returns 0 regardless of how final
> > mt7615_init_tx_queue() performs. If mt7615_init_tx_queue() fails (due
> > to memory issues, for instance), parent function will still
> > erroneously return 0."
> 
> And how can memory issues actually be triggered in a real system?  Is this a
> fake problem or something you can validate and verify works properly?
> 
> Don't worry about fake issues for stable backports please.
> 
> thanks,
> 
> greg k-h

mt7615_init_tx_queue() calls devm_kzalloc() (which can throw -ENOMEM) and mt76_queue_alloc() (which can also fail). It's hard for me to gauge how probable these failures can be. But I feel like at the very least it's a logical sanity check. 

@@ -82,7 +82,7 @@ mt7615_init_tx_queues(struct mt7615_dev *dev)
 	
        ret = mt7615_init_tx_queue(dev, MT_TXQ_MCU, MT7615_TXQ_MCU,
                                   MT7615_TX_MCU_RING_SIZE);
       return 0;

There is no special reason  for mt7615_init_tx_queues() to ignore last 'ret'. If last mt7615_init_tx_queue(), so should mt7615_init_tx_queues(). And upstream patch (b671da33d1c5973f90f098ff66a91953691df582) addresses this as well. 
If you feel differently, I will of course back down.

regards,

Nikita