Re: [PATCH 1/2] ipv6: do not hold route table lock when send ndisc probe

On Fri, 2012-08-17 at 14:54 -0400, Debabrata Banerjee wrote:

Well it get rids of the deadlock for sure, but I am not sure it
doesn't break something else, one would have to know all of this code
much better to tell. You'll notice read_unlock_bh(&table->tb6_lock)
for the first lock in ip6_pol_route() has more in the critical section
after the rt6_select() call, especially that rather scary BACKTRACK()
macro.

Yeah, I noticed that, ->tb6_lock seems to protect lookup of ->tb6_root,
not sure if 'rt' may still valid after retaking this lock... Hmm,
probably calling ndisc_send_ns() inside a work is a better approach.

I will update the patch.

Thanks!