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From: Pyun YongHyeon <yongari@FreeBSD.org>
Date: Thu, 23 Feb 2012 05:10:00 +0000 (UTC)
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Subject: svn commit: r232019 - head/sys/dev/sf
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Author: yongari
Date: Thu Feb 23 05:10:00 2012
New Revision: 232019
URL: http://svn.freebsd.org/changeset/base/232019

Log:
  Give hardware chance to drain active DMA cycles.

Modified:
  head/sys/dev/sf/if_sf.c

Modified: head/sys/dev/sf/if_sf.c
==============================================================================
--- head/sys/dev/sf/if_sf.c	Thu Feb 23 04:32:41 2012	(r232018)
+++ head/sys/dev/sf/if_sf.c	Thu Feb 23 05:10:00 2012	(r232019)
@@ -2329,6 +2329,9 @@ sf_stop(struct sf_softc *sc)
 	/* Disable Tx/Rx egine. */
 	csr_write_4(sc, SF_GEN_ETH_CTL, 0);
 
+	/* Give hardware chance to drain active DMA cycles. */
+	DELAY(1000);
+
 	csr_write_4(sc, SF_CQ_CONSIDX, 0);
 	csr_write_4(sc, SF_CQ_PRODIDX, 0);
 	csr_write_4(sc, SF_RXDQ_ADDR_Q1, 0);