8634 epoll fails to wake on certain edge-triggered conditions
8635 epoll should not emit POLLNVAL
8636 recursive epoll should emit EPOLLRDNORM
Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Toomas Soome <tsoome@me.com>
Reviewed by: Igor Kozhukhov <igor@dilos.org>

*** 23,33 ****
   * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
  /*
!  * Copyright (c) 2014, Joyent, Inc. All rights reserved.
   */
  
  /*
   * av1394 asynchronous module
   */
--- 23,33 ----
   * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
  /*
!  * Copyright 2017 Joyent, Inc.
   */
  
  /*
   * av1394 asynchronous module
   */
*** 348,374 ****
  
          AV1394_TNF_EXIT(av1394_async_ioctl);
          return (ret);
  }
  
- /*ARGSUSED*/
  int
  av1394_async_poll(av1394_inst_t *avp, short events, int anyyet, short *reventsp,
                  struct pollhead **phpp)
  {
          av1394_async_t  *ap = &avp->av_a;
          av1394_queue_t  *rq = &ap->a_rq;
  
          AV1394_TNF_ENTER(av1394_async_poll);
  
!         if (events & POLLIN) {
!                 if (av1394_peekq(rq))
                          *reventsp |= POLLIN;
  
                  if ((!*reventsp && !anyyet) || (events & POLLET)) {
                          mutex_enter(&ap->a_mutex);
                          ap->a_pollevents |= POLLIN;
                          *phpp = &ap->a_pollhead;
                          mutex_exit(&ap->a_mutex);
                  }
          }
  
--- 348,376 ----
  
          AV1394_TNF_EXIT(av1394_async_ioctl);
          return (ret);
  }
  
  int
  av1394_async_poll(av1394_inst_t *avp, short events, int anyyet, short *reventsp,
      struct pollhead **phpp)
  {
          av1394_async_t  *ap = &avp->av_a;
          av1394_queue_t  *rq = &ap->a_rq;
  
          AV1394_TNF_ENTER(av1394_async_poll);
  
!         if (events & (POLLIN | POLLET)) {
!                 if ((events & POLLIN) && av1394_peekq(rq)) {
                          *reventsp |= POLLIN;
+                 }
  
                  if ((!*reventsp && !anyyet) || (events & POLLET)) {
                          mutex_enter(&ap->a_mutex);
+                         if (events & POLLIN) {
                                  ap->a_pollevents |= POLLIN;
+                         }
                          *phpp = &ap->a_pollhead;
                          mutex_exit(&ap->a_mutex);
                  }
          }