Xie He 1fef73597f
net: hdlc_ppp: Fix issues when mod_timer is called while timer is running ...
ppp_cp_event is called directly or indirectly by ppp_rx with "ppp->lock"
held. It may call mod_timer to add a new timer. However, at the same time
ppp_timer may be already running and waiting for "ppp->lock". In this
case, there's no need for ppp_timer to continue running and it can just
exit.
If we let ppp_timer continue running, it may call add_timer. This causes
kernel panic because add_timer can't be called with a timer pending.
This patch fixes this problem.
Fixes: e022c2f07akhc@pm.waw.pl >
Signed-off-by: Xie He <xie.he.0141@gmail.com >
Signed-off-by: David S. Miller <davem@davemloft.net >
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