Re: [rfc] more atm cleanup

["David S. Miller" <davem@xxxxxxxxxx>]

   From: chas williams <chas@xxxxxxxxxxxxxxxx>
   Date: Mon, 23 Jun 2003 23:50:54 -0400

   here's a couple of changes, in short, protect/setup br2684 and pppoatm
   ioctl's with a mutex, get rid of sleep in vcc and just use sock->sleep,
   replace wake_up() with sk_state_change and sk_data_ready (sk_write_space
   needs some thinking so we have one wake_up not converted).  vcc->callback()
   also goes away in favor of sk_state_change().
   
This one looks good to me.