Messages in this thread | | | Date | Wed, 7 Jun 2017 15:28:17 +0200 | From | Richard Cochran <> | Subject | Re: [PATCH v2 4/4] net: macb: Add hardware PTP support |
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On Wed, Jun 07, 2017 at 11:13:36AM +0000, Rafal Ozieblo wrote: > Please look at following call-stack: > > 1. macb_interrupt() // spin_lock(&bp->lock) is taken > 2. macb_tx_interrupt() > 3. macb_handle_txtstamp() > 4. skb_tstamp_tx() > 5. __skb_tstamp_tx() > 6. skb_may_tx_timestamp() > 7. read_lock_bh() // second lock is taken
Well, you can always drop the lock, or postpone the call to skb_tstamp_tx() until after the spin lock is released...
> I know that those are different locks and different types. But this could lead > to deadlocks. This is the reason of warning I could see.
Can you please post the lockdep splat?
Thanks, Richard
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