Re: [PATCH] Fix kernel lockup in RTL-8169 gigabit ethernet driver

[Francois Romieu]

Manfred Spraul <manfred@xxxxxxxxxxxxxxxx> :
[...]
> Thanks. The code reloads the tx ring value from memory, thus I don't 
> understand why it deadlocks.

Well...
- rtl8169_interrupt() acks all events before rtl8169_tx_interrupt() is called
- the count of descriptors handled in rtl8169_tx_interrupt() is only limited
  by the number of packets submitted for TX at the time rtl8169_tx_interrupt()
  is called

-> if there is a stream of Tx events, it is possible that Tx descriptors are
   processed before the relevant event is notified to the host by the network
   adapter.

--
Ueimor
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