Re: [PATCH net-next] tcp: Revert "tcp: tcp_probe: use spin_lock_bh()"

From: Eric Dumazet <redacted>
Date: Tue, 21 Feb 2017 06:21:47 -0800

This reverts commit e70ac171658679ecf6bea4bbd9e9325cd6079d2b.

jtcp_rcv_established() is in fact called with hard irq being disabled.

Initial bug report from Ricardo Nabinger Sanchez [1] still needs
to be investigated, but does not look like a TCP bug.

[1] https://www.spinics.net/lists/netdev/msg420960.html

Signed-off-by: Eric Dumazet <redacted>
Reported-by: kernel test robot <redacted>
Cc: Ricardo Nabinger Sanchez <redacted>

Applied.

But your analysis was quite sound, we can now invoke TCP input path
from user context, therefore this jprobe needs to use BH locking.  What
is the problem.