Allow a bus_dmamap_sync() of length zero.

ok tedu@

diff --git a/sys/arch/arm/arm/bus_dma.c b/sys/arch/arm/arm/bus_dma.c
index cdd7c21..6f69614 100644 (file)
--- a/sys/arch/arm/arm/bus_dma.c
+++ b/sys/arch/arm/arm/bus_dma.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: bus_dma.c,v 1.30 2016/05/16 15:13:50 kettenis Exp $   */
+/*     $OpenBSD: bus_dma.c,v 1.31 2016/08/14 10:32:17 kettenis Exp $   */
 /*     $NetBSD: bus_dma.c,v 1.38 2003/10/30 08:44:13 scw Exp $ */
 
 /*-
@@ -589,7 +589,7 @@ _bus_dmamap_sync(bus_dma_tag_t t, bus_dmamap_t map, bus_addr_t offset,
        if (offset >= map->dm_mapsize)
                panic("_bus_dmamap_sync: bad offset %lu (map size is %lu)",
                    offset, map->dm_mapsize);
-       if (len == 0 || (offset + len) > map->dm_mapsize)
+       if ((offset + len) > map->dm_mapsize)
                panic("_bus_dmamap_sync: bad length");
 #endif