From: Jon Maloy <jon.ma...@ericsson.com> Date: Wed, 23 Nov 2016 21:05:26 -0500
> commit 817298102b0b ("tipc: fix link priority propagation") introduced a > compatibility problem between TIPC versions newer than Linux 4.6 and > those older than Linux 4.4. In versions later than 4.4, link STATE > messages only contain a non-zero link priority value when the sender > wants the receiver to change its priority. This has the effect that the > receiver resets itself in order to apply the new priority. This works > well, and is consistent with the said commit. > > However, in versions older than 4.4 a valid link priority is present in > all sent link STATE messages, leading to cyclic link establishment and > reset on the 4.6+ node. > > We fix this by adding a test that the received value should not only > be valid, but also differ from the current value in order to cause the > receiving link endpoint to reset. > > Reported-by: Amar Nv <amar.nv...@gmail.com> > Signed-off-by: Jon Maloy <jon.ma...@ericsson.com> Applied.