From: gfree.wind@xxxxxxxxxxx
Date: Mon, 17 Jul 2017 18:34:42 +0800
> From: Gao Feng <gfree.wind@xxxxxxxxxxx>
>
> The global percpu variable ppp_xmit_recursion is used to detect the ppp
> xmit recursion to avoid the deadlock, which is caused by one CPU tries to
> lock the xmit lock twice. But it would report false recursion when one CPU
> wants to send the skb from two different PPP devices, like one L2TP on the
> PPPoE. It is a normal case actually.
>
> Now use one percpu member of struct ppp instead of the gloable variable to
> detect the xmit recursion of one ppp device.
>
> Fixes: 55454a565836 ("ppp: avoid dealock on recursive xmit")
> Signed-off-by: Gao Feng <gfree.wind@xxxxxxxxxxx>
> Signed-off-by: Liu Jianying <jianying.liu@xxxxxxxxxx>
Indeed, for a per-ppp lock recursion check we need a per-ppp counter.
Applied, thanks!
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