[src/trunk]: src/sys/kern release kernel lock in uiomove().

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

details:   https://anonhg.NetBSD.org/src/rev/ccfcdcff5121
branches:  trunk
changeset: 570091:ccfcdcff5121
user:      yamt <yamt%NetBSD.org@localhost>
date:      Thu Sep 23 10:45:08 2004 +0000

description:
release kernel lock in uiomove().

diffstat:

 sys/kern/kern_subr.c |  20 ++++++++++++++++----
 1 files changed, 16 insertions(+), 4 deletions(-)

diffs (62 lines):

diff -r 27ca8bc80d52 -r ccfcdcff5121 sys/kern/kern_subr.c
--- a/sys/kern/kern_subr.c      Thu Sep 23 10:06:21 2004 +0000
+++ b/sys/kern/kern_subr.c      Thu Sep 23 10:45:08 2004 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: kern_subr.c,v 1.111 2004/04/21 20:31:50 matt Exp $     */
+/*     $NetBSD: kern_subr.c,v 1.112 2004/09/23 10:45:08 yamt Exp $     */
 
 /*-
  * Copyright (c) 1997, 1998, 1999, 2002 The NetBSD Foundation, Inc.
@@ -86,7 +86,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: kern_subr.c,v 1.111 2004/04/21 20:31:50 matt Exp $");
+__KERNEL_RCSID(0, "$NetBSD: kern_subr.c,v 1.112 2004/09/23 10:45:08 yamt Exp $");
 
 #include "opt_ddb.h"
 #include "opt_md.h"
@@ -146,6 +146,16 @@
        int error = 0;
        char *cp = buf;
        struct proc *p = uio->uio_procp;
+       int hold_count;
+
+       hold_count = KERNEL_LOCK_RELEASE_ALL();
+
+#if defined(LOCKDEBUG) || defined(DIAGNOSTIC)
+       spinlock_switchcheck();
+#endif
+#ifdef LOCKDEBUG
+       simple_lock_only_held(NULL, "uiomove");
+#endif
 
 #ifdef DIAGNOSTIC
        if (uio->uio_rw != UIO_READ && uio->uio_rw != UIO_WRITE)
@@ -182,7 +192,7 @@
                                            cp, cnt);
                        }
                        if (error)
-                               return (error);
+                               goto out;
                        break;
 
                case UIO_SYSSPACE:
@@ -191,7 +201,7 @@
                        else
                                error = kcopy(iov->iov_base, cp, cnt);
                        if (error)
-                               return (error);
+                               goto out;
                        break;
                }
                iov->iov_base = (caddr_t)iov->iov_base + cnt;
@@ -202,6 +212,8 @@
                KDASSERT(cnt <= n);
                n -= cnt;
        }
+out:
+       KERNEL_LOCK_ACQUIRE_COUNT(hold_count);
        return (error);
 }