[src/trunk]: src/sys/dev/dkwedge determine the buffer size by roundup(9)

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

details:   https://anonhg.NetBSD.org/src/rev/a42223fc4325
branches:  trunk
changeset: 351823:a42223fc4325
user:      rin <rin%NetBSD.org@localhost>
date:      Tue Feb 28 04:46:02 2017 +0000

description:
determine the buffer size by roundup(9)

diffstat:

 sys/dev/dkwedge/dkwedge_rdb.c |  16 +++++++---------
 1 files changed, 7 insertions(+), 9 deletions(-)

diffs (44 lines):

diff -r beb2ee45b324 -r a42223fc4325 sys/dev/dkwedge/dkwedge_rdb.c
--- a/sys/dev/dkwedge/dkwedge_rdb.c     Tue Feb 28 04:39:58 2017 +0000
+++ b/sys/dev/dkwedge/dkwedge_rdb.c     Tue Feb 28 04:46:02 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: dkwedge_rdb.c,v 1.2 2017/02/28 04:39:58 rin Exp $      */
+/*     $NetBSD: dkwedge_rdb.c,v 1.3 2017/02/28 04:46:02 rin Exp $      */
 
 /*
  * Adapted from arch/amiga/amiga/disksubr.c:
@@ -68,7 +68,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: dkwedge_rdb.c,v 1.2 2017/02/28 04:39:58 rin Exp $");
+__KERNEL_RCSID(0, "$NetBSD: dkwedge_rdb.c,v 1.3 2017/02/28 04:46:02 rin Exp $");
 
 #include <sys/param.h>
 #include <sys/disklabel_rdb.h>
@@ -124,9 +124,8 @@
        bool found, root, swap;
 
        secsize = bufsize = DEV_BSIZE << pdk->dk_blkshift;
-       while (bufsize < sizeof(struct partblock) ||
-              bufsize < sizeof(struct rdblock))
-               bufsize *= 2;
+       bufsize = roundup(MAX(sizeof(struct partblock), sizeof(struct rdblock)),
+           secsize);
        bp = DKW_MALLOC(bufsize);
 
        /*
@@ -160,10 +159,9 @@
        if (secsize != newsecsize) {
                aprint_verbose("secsize changed from %u to %u\n",
                    secsize, newsecsize);
-               secsize = bufsize = newsecsize;
-               while (bufsize < sizeof(struct partblock) ||
-                      bufsize < sizeof(struct rdblock))
-                       bufsize *= 2;
+               secsize = newsecsize;
+               bufsize = roundup(MAX(sizeof(struct partblock),
+                   sizeof(struct rdblock)), secsize);
                bp = DKW_REALLOC(bp, bufsize);
        }