From: Florian Fainelli <f.faine...@gmail.com>
Date: Fri, 20 Oct 2017 15:59:30 -0700
> Because SYSTEMPORT is a (semi) normal network device, the stack may attempt to
> queue packets on it oustide of the DSA slave transmit path. When that
> happens,
> the DSA layer has not had a chance to tag packets with the appropriate
> per-port
> and per-queue information, and if that happens and we don't have a port 0
> queue
> 0 available (e.g: on boards where this does not exist), we will hit a NULL
> pointer de-reference in bcm_sysport_select_queue().
>
> Guard against such cases by testing for the TX ring validity.
>
> Fixes: 84ff33eeb23d ("net: systemport: Establish DSA network device queue
> mapping")
> Signed-off-by: Florian Fainelli <f.faine...@gmail.com>
Applied, thanks.
