[src/trunk]: src/sys/dev/ic Since the RFA is allocated in a normal mbuf, as o...

[thorpej <thorpej%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/d3480d13b0d7
branches:  trunk
changeset: 494044:d3480d13b0d7
user:      thorpej <thorpej%NetBSD.org@localhost>
date:      Thu Jun 29 16:53:48 2000 +0000

description:
Since the RFA is allocated in a normal mbuf, as opposed to DMA-safe
memory that is explicitly mapped in a DMA-coherent manner, we must
make sure to PREREAD sync the RFA after noticing a clear "complete"
bit.  Without this, the clear bit will linger in the cache, and the
CPU will not notice when the chip updates the bit via DMA later.

>From Izumi Tsutsui on port-arm32%netbsd.org@localhost.

diffstat:

 sys/dev/ic/i82557.c |  3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diffs (17 lines):

diff -r fbfdf03ff997 -r d3480d13b0d7 sys/dev/ic/i82557.c
--- a/sys/dev/ic/i82557.c       Thu Jun 29 16:47:09 2000 +0000
+++ b/sys/dev/ic/i82557.c       Thu Jun 29 16:53:48 2000 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: i82557.c,v 1.35 2000/06/28 17:12:57 mrg Exp $  */
+/*     $NetBSD: i82557.c,v 1.36 2000/06/29 16:53:48 thorpej Exp $      */
 
 /*-
  * Copyright (c) 1997, 1998, 1999 The NetBSD Foundation, Inc.
@@ -923,6 +923,7 @@
                                 * We have processed all of the
                                 * receive buffers.
                                 */
+                               FXP_RFASYNC(sc, m, BUS_DMASYNC_PREREAD);
                                goto do_transmit;
                        }