ia64/xen-unstable

changeset 18647:dc61548aa479

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Fix SCHEDOP_poll to avoid wakeup-waiting race on interrupt delivery.

Race found by Jan Beulich.

Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Oct 16 18:36:43 2008 +0100 (2008-10-16)
parents bb1a67a7db26
children 6bf61b830153
files xen/common/schedule.c
line diff
     1.1 --- a/xen/common/schedule.c	Thu Oct 16 15:46:04 2008 +0100
     1.2 +++ b/xen/common/schedule.c	Thu Oct 16 18:36:43 2008 +0100
     1.3 @@ -455,6 +455,10 @@ static long do_poll(struct sched_poll *s
     1.4          goto out;
     1.5  #endif
     1.6  
     1.7 +    rc = 0;
     1.8 +    if ( local_events_need_delivery() )
     1.9 +        goto out;
    1.10 +
    1.11      for ( i = 0; i < sched_poll->nr_ports; i++ )
    1.12      {
    1.13          rc = -EFAULT;