From aec0bcdf5bda6eb6d186516bf5561e3d196418b6 Mon Sep 17 00:00:00 2001
From: John Dyson <dyson@FreeBSD.org>
Date: Sat, 4 Apr 1998 05:55:05 +0000
Subject: [PATCH] Perhaps fix a problem that some drivers have that they don't
 properly initialize the b_kvasize element.  This might fix some of the split
 I/O requests that some people have.

---
 sys/kern/kern_physio.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sys/kern/kern_physio.c b/sys/kern/kern_physio.c
index 63978434e08..8261bbf370f 100644
--- a/sys/kern/kern_physio.c
+++ b/sys/kern/kern_physio.c
@@ -16,7 +16,7 @@
  * 4. Modifications may be freely made to this file if the above conditions
  *    are met.
  *
- * $Id: kern_physio.c,v 1.24 1998/03/19 22:48:05 dyson Exp $
+ * $Id: kern_physio.c,v 1.25 1998/03/28 10:33:05 bde Exp $
  */
 
 #include <sys/param.h>
@@ -176,7 +176,7 @@ minphys(bp)
 	if (bdsw && bdsw->d_maxio) {
 		maxphys = bdsw->d_maxio;
 	}
-	if (bp->b_kvasize < maxphys)
+	if (bp->b_kvasize && (bp->b_kvasize < maxphys))
 		maxphys = bp->b_kvasize;
 
 	if(((vm_offset_t) bp->b_data) & PAGE_MASK) {