[OpenWrt-Devel] [PATCH v2 2/2] kernel: atm: pppoatm fix vc-mux connection failures

[David Woodhouse]

On Sat, 2018-06-16 at 09:48 +0000, David Woodhouse wrote:
> 
> > Backport a hot off the press upstream kernel ATM fix:
> >
> > Preserve value of skb->truesize when accounting to vcc
> >
> > "There's a hack in pskb_expand_head() to avoid adjusting skb->truesize
> > for certain skbs. Ideally it would cover ATM too. It doesn't. Just
> > stashing the accounted value and using it in atm_raw_pop() is probably
> > the easiest way to cope."
> >
> > The issue was introduced in upstream by:
> >
> > commit 14afee4b6092fde451ee17604e5f5c89da33e71e
> > Author: Reshetova, Elena <elena.reshetova at intel.com>
> > Date:   Fri Jun 30 13:08:00 2017 +0300
> >
> >     net: convert sock.sk_wmem_alloc from atomic_t to refcount_t
> >
> > Sincerest thanks to Mathias Kresin <dev at kresin.me> for debugging
> > assistance and to David Woodhouse <dwmw2 at infradead.org> for further
> > guidance, cajoling & patience in interpreting the debug I was giving him
> > and producing a fix!
> >
> > Fixes FS#1567
> 
> Is it tested with PPPoA+LLC-encaps and (more importantly) PPPoE+BR2684?
> (Please)

Ah, I see your 5am assertion that it is. Thanks again for going above
and beyond to help diagnose and fix this.
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