pppox: drain queued packets on channel handoff

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PPPIOCGCHAN both returns the channel index and marks a PPPOX socket as
bound to generic PPP, despite its getter semantic. Packets received
before that transition are queued on sk_receive_queue, but a bound
socket is no longer readable. Such packets therefore remain queued until
the socket is destroyed.

After marking a socket bound, wait for receive paths that observed the
old state to finish queueing packets, and then drain the queue into
generic PPP.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Qingfang Deng <qingfang.deng@linux.dev>
Link: https://patch.msgid.link/20260811035314.302878-1-qingfang.deng@linux.dev
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Qingfang Deng 2026-08-11 11:53:10 +08:00 • committed by Jakub Kicinski

parent 4f1d06cf8a

commit 92c1bf630a

1 changed files with 17 additions and 0 deletions

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17

drivers/net/ppp/pppox.c

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