[src/trunk]: src/sys/fs/puffs Allow clients to reuse a "park".

[pooka <pooka%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/64a44006b8e5
branches:  trunk
changeset: 758671:64a44006b8e5
user:      pooka <pooka%NetBSD.org@localhost>
date:      Fri Nov 12 17:46:09 2010 +0000

description:
Allow clients to reuse a "park".

Patch from <yamt>, fixes PR kern/44086 by him.

diffstat:

 sys/fs/puffs/puffs_msgif.c |  12 ++++++++++--
 1 files changed, 10 insertions(+), 2 deletions(-)

diffs (33 lines):

diff -r 5885e9d5cd12 -r 64a44006b8e5 sys/fs/puffs/puffs_msgif.c
--- a/sys/fs/puffs/puffs_msgif.c        Fri Nov 12 17:35:34 2010 +0000
+++ b/sys/fs/puffs/puffs_msgif.c        Fri Nov 12 17:46:09 2010 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: puffs_msgif.c,v 1.82 2010/07/06 17:00:06 pooka Exp $   */
+/*     $NetBSD: puffs_msgif.c,v 1.83 2010/11/12 17:46:09 pooka Exp $   */
 
 /*
  * Copyright (c) 2005, 2006, 2007  Antti Kantee.  All Rights Reserved.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: puffs_msgif.c,v 1.82 2010/07/06 17:00:06 pooka Exp $");
+__KERNEL_RCSID(0, "$NetBSD: puffs_msgif.c,v 1.83 2010/11/12 17:46:09 pooka Exp $");
 
 #include <sys/param.h>
 #include <sys/atomic.h>
@@ -332,6 +332,14 @@
        struct puffs_req *preq, *creq;
        ssize_t delta;
 
+       /*
+        * Some clients reuse a park, so reset some flags.  We might
+        * want to provide a caller-side interface for this and add
+        * a few more invariant checks here, but this will do for now.
+        */
+       park->park_flags &= ~(PARKFLAG_DONE | PARKFLAG_HASERROR);
+       KASSERT((park->park_flags & PARKFLAG_WAITERGONE) == 0);
+
        mp = PMPTOMP(pmp);
        preq = park->park_preq;