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sctp: do not update a_rwnd if we are not issuing a sack
The SACK can be lost pretty much elsewhere, but if its allocation fail, we know we are not sending it, so it is better to revert a_rwnd to its previous value as this may give it a chance to issue a window update later. Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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