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From: John Baldwin <jhb@FreeBSD.org>
Date: Fri, 13 Jun 2014 19:40:02 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r267449 - head/sys/dev/iwn
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Author: jhb
Date: Fri Jun 13 19:40:02 2014
New Revision: 267449
URL: http://svnweb.freebsd.org/changeset/base/267449

Log:
  - Don't check the dma map address for a static DMA mapping against NULL
    to determine if the mapping is valid.
  - Don't explicitly destroy the dmap map for static DMA mappings.
  
  Reviewed by:	adrian

Modified:
  head/sys/dev/iwn/if_iwn.c

Modified: head/sys/dev/iwn/if_iwn.c
==============================================================================
--- head/sys/dev/iwn/if_iwn.c	Fri Jun 13 19:34:34 2014	(r267448)
+++ head/sys/dev/iwn/if_iwn.c	Fri Jun 13 19:40:02 2014	(r267449)
@@ -1733,16 +1733,12 @@ fail:	iwn_dma_contig_free(dma);
 static void
 iwn_dma_contig_free(struct iwn_dma_info *dma)
 {
-	if (dma->map != NULL) {
-		if (dma->vaddr != NULL) {
-			bus_dmamap_sync(dma->tag, dma->map,
-			    BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
-			bus_dmamap_unload(dma->tag, dma->map);
-			bus_dmamem_free(dma->tag, dma->vaddr, dma->map);
-			dma->vaddr = NULL;
-		}
-		bus_dmamap_destroy(dma->tag, dma->map);
-		dma->map = NULL;
+	if (dma->vaddr != NULL) {
+		bus_dmamap_sync(dma->tag, dma->map,
+		    BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
+		bus_dmamap_unload(dma->tag, dma->map);
+		bus_dmamem_free(dma->tag, dma->vaddr, dma->map);
+		dma->vaddr = NULL;
 	}
 	if (dma->tag != NULL) {
 		bus_dma_tag_destroy(dma->tag);