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Date:      Wed, 29 May 2019 16:01:34 +0000 (UTC)
From:      Ruslan Bukin <br@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r348364 - head/sys/dev/xdma
Message-ID:  <201905291601.x4TG1YDx084083@repo.freebsd.org>

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Author: br
Date: Wed May 29 16:01:34 2019
New Revision: 348364
URL: https://svnweb.freebsd.org/changeset/base/348364

Log:
  Don't copy the data from bounce buffer back to the mbuf if channel does
  not use bounce buffering.
  
  Sponsored by:	DARPA, AFRL

Modified:
  head/sys/dev/xdma/xdma_sg.c

Modified: head/sys/dev/xdma/xdma_sg.c
==============================================================================
--- head/sys/dev/xdma/xdma_sg.c	Wed May 29 15:53:33 2019	(r348363)
+++ head/sys/dev/xdma/xdma_sg.c	Wed May 29 16:01:34 2019	(r348364)
@@ -348,7 +348,8 @@ xchan_seg_done(xdma_channel_t *xchan,
 				    BUS_DMASYNC_POSTREAD);
 			bus_dmamap_unload(xchan->dma_tag_bufs, b->map);
 		} else {
-			if (xr->req_type == XR_TYPE_MBUF &&
+			if ((xchan->caps & XCHAN_CAP_NOBUFS) == 0 &&
+			    xr->req_type == XR_TYPE_MBUF &&
 			    xr->direction == XDMA_DEV_TO_MEM)
 				m_copyback(xr->m, 0, st->transferred,
 				    (void *)xr->buf.vaddr);



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