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Avoid a panic if we are asked to sync a zero-length map, by returning 

immediately.
This commit is contained in:
jdc 2009-12-05 16:48:26 +00:00
parent 4d33475520
commit 0a653c3d77
1 changed files with 6 additions and 2 deletions
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8
sys/arch/sparc64/dev/iommu.c
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@ -1,4 +1,4 @@
/* $NetBSD: iommu.c,v 1.88 2009/11/07 07:27:46 cegger Exp $ */
/* $NetBSD: iommu.c,v 1.89 2009/12/05 16:48:26 jdc Exp $ */
/*
* Copyright (c) 1999, 2000 Matthew R. Green
@ -59,7 +59,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: iommu.c,v 1.88 2009/11/07 07:27:46 cegger Exp $");
__KERNEL_RCSID(0, "$NetBSD: iommu.c,v 1.89 2009/12/05 16:48:26 jdc Exp $");
#include "opt_ddb.h"
@ -1000,6 +1000,10 @@ iommu_dvmamap_sync(bus_dma_tag_t t, bus_dmamap_t map, bus_addr_t offset,
bus_size_t len, int ops)
{
/* If len is 0, then there is nothing to do */
if (len == 0)
return;
if (ops & (BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE)) {
/* Flush the CPU then the IOMMU */
bus_dmamap_sync(t->_parent, map, offset, len, ops);