Merge branch 'rxrpc-fixes'

David Howells says:

====================
rxrpc: Miscellaneous fixes

Here are some fixes for AF_RXRPC:

 (1) Fix listen() allowing preallocation to overrun the prealloc buffer.

 (2) Prevent resending the request if we've seen the reply starting to
     arrive.

 (3) Fix accidental sharing of ACK state between transmission and
     reception.

 (4) Ignore ACKs in which ack.previousPacket regresses.  This indicates the
     highest DATA number so far seen, so should not be seen to go
     backwards.

 (5) Fix the determination of when to generate an IDLE-type ACK,
     simplifying it so that we generate one if we have more than two DATA
     packets that aren't hard-acked (consumed) or soft-acked (in the rx
     buffer, but could be discarded and re-requested).
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

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