[src/trunk]: src/sys/arch/next68k/stand/boot Avoid possible division by zero ...

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

details:   https://anonhg.NetBSD.org/src/rev/b994212af8ef
branches:  trunk
changeset: 373434:b994212af8ef
user:      tsutsui <tsutsui%NetBSD.org@localhost>
date:      Thu Feb 09 14:41:54 2023 +0000

description:
Avoid possible division by zero trap in error cases to make debug easier.

diffstat:

 sys/arch/next68k/stand/boot/sd.c |  6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diffs (20 lines):

diff -r ed83051ddbae -r b994212af8ef sys/arch/next68k/stand/boot/sd.c
--- a/sys/arch/next68k/stand/boot/sd.c  Thu Feb 09 14:09:47 2023 +0000
+++ b/sys/arch/next68k/stand/boot/sd.c  Thu Feb 09 14:41:54 2023 +0000
@@ -1,4 +1,4 @@
-/*      $NetBSD: sd.c,v 1.13 2023/02/04 14:38:09 tsutsui Exp $        */
+/*      $NetBSD: sd.c,v 1.14 2023/02/09 14:41:54 tsutsui Exp $        */
 /*
  * Copyright (c) 1994 Rolf Grossmann
  * All rights reserved.
@@ -135,6 +135,10 @@
        return error<0 ? EHER : error;
     blklen = (cap.length[0]<<24) + (cap.length[1]<<16)
             + (cap.length[2]<<8) + cap.length[3];
+
+    /* avoid division by zero trap even on possible xfer errors */
+    if (blklen == 0)
+       blklen = DEV_BSIZE;
     ss->sc_dev_bsize = blklen;
 
     ss->sc_pinfo.offset[ss->sc_part] = 0; /* read absolute sector */