On Thu, Jul 24, 2014 at 10:41:35PM +0200, Eric Dumazet wrote:

From: Eric Dumazet <edumazet@google.com>

getsockopt() or setsockopt() sometimes returns -EINTR instead of
-ENOPROTOOPT, causing headaches to application developers.

This is because unsupported commands might go through nf_sockopt_find()
and this function returns -EINTR if a signal is pending.

Just use non interruptible mutex functions, as there is no reason
we should sleep for a long time here.

On top of this patch, I think that at least we can also ged rid of
these interruptible mutex from the netfilter/core code too (see
preliminary patch attached).

I can also adapt the callers so they don't check anymore the return
value as they will always succeed.

Comments? Thanks.