[src/trunk]: src/sys/arch/vax/vsa Do not expect a struct buf to be present if...

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

details:   https://anonhg.NetBSD.org/src/rev/c761c6e2d85c
branches:  trunk
changeset: 970403:c761c6e2d85c
user:      ragge <ragge%NetBSD.org@localhost>
date:      Sun Mar 22 20:27:47 2020 +0000

description:
Do not expect a struct buf to be present if doing DMA to kernel space.
Fixes bug reported by sadness on port-vax.

diffstat:

 sys/arch/vax/vsa/ncr.c |  10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)

diffs (31 lines):

diff -r 3586e9566595 -r c761c6e2d85c sys/arch/vax/vsa/ncr.c
--- a/sys/arch/vax/vsa/ncr.c    Sun Mar 22 20:26:59 2020 +0000
+++ b/sys/arch/vax/vsa/ncr.c    Sun Mar 22 20:27:47 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ncr.c,v 1.49 2018/09/03 16:29:28 riastradh Exp $       */
+/*     $NetBSD: ncr.c,v 1.50 2020/03/22 20:27:47 ragge Exp $   */
 
 /*-
  * Copyright (c) 1996 The NetBSD Foundation, Inc.
@@ -42,7 +42,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ncr.c,v 1.49 2018/09/03 16:29:28 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ncr.c,v 1.50 2020/03/22 20:27:47 ragge Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -275,7 +275,11 @@
        dh->dh_flags = SIDH_BUSY;
        dh->dh_addr = ncr_sc->sc_dataptr;
        dh->dh_len = xlen;
-       dh->dh_proc = xs->bp->b_proc;
+       if (((vaddr_t)ncr_sc->sc_dataptr & KERNBASE) == 0) {
+               if (xs->bp == NULL)
+                       panic("si_dma_alloc");
+               dh->dh_proc = xs->bp->b_proc;
+       }
 
        /* Remember dest buffer parameters */
        if (xs->xs_control & XS_CTL_DATA_OUT)