tweaks sleeping for an mbuf so it's more mpsafe.

the stack puts an mbuf on the tun ifq, and ifqs protect themselves
with a mutex. rather than invent another lock that tun can wrap
these ifq ops with and also coordinate it's conditionals (reading
and dying) with, try and reuse the ifq mtx for the tun stuff too.

because ifqs are more special than tun, this adds a special
ifq_deq_sleep to ifq code that tun can call. tun just passes the
reading and dying variables to ifq to check, but the tricky stuff
about ifqs are kept in the right place.

with this, tun_dev_read should be callable without the kernel lock.

0 files changed, 0 insertions, 0 deletions