[src/trunk]: src/sys/dev/raidframe Always return at least one parity region. ...

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

details:   https://anonhg.NetBSD.org/src/rev/d126988a5a5d
branches:  trunk
changeset: 762823:d126988a5a5d
user:      riz <riz%NetBSD.org@localhost>
date:      Tue Mar 01 22:51:14 2011 +0000

description:
Always return at least one parity region.  Fixes PR#44239.
Fix from oster@, code (such as it is) by me.

diffstat:

 sys/dev/raidframe/rf_paritymap.c |  6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diffs (27 lines):

diff -r 730267c1867d -r d126988a5a5d sys/dev/raidframe/rf_paritymap.c
--- a/sys/dev/raidframe/rf_paritymap.c  Tue Mar 01 21:47:13 2011 +0000
+++ b/sys/dev/raidframe/rf_paritymap.c  Tue Mar 01 22:51:14 2011 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: rf_paritymap.c,v 1.5 2010/03/14 21:11:41 jld Exp $ */
+/* $NetBSD: rf_paritymap.c,v 1.6 2011/03/01 22:51:14 riz Exp $ */
 
 /*-
  * Copyright (c) 2009 Jed Davis.
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: rf_paritymap.c,v 1.5 2010/03/14 21:11:41 jld Exp $");
+__KERNEL_RCSID(0, "$NetBSD: rf_paritymap.c,v 1.6 2011/03/01 22:51:14 riz Exp $");
 
 #include <sys/param.h>
 #include <sys/callout.h>
@@ -409,6 +409,8 @@
        nreg = bytes_per_disk / REGION_MINSIZE;
        if (nreg > RF_PARITYMAP_NREG)
                nreg = RF_PARITYMAP_NREG;
+       if (nreg < 1)
+               nreg = 1;
 
        return (u_int)nreg;
 }