From: Leendert van Doorn <leendert@paramecium.org>
Date: Mon, 13 Jun 2016 13:14:42 +0000 (-0500)
Subject: [tg3] Add missing memory barrier
X-Git-Tag: v1.20.1~427
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=02d5cfff22e3796f3ecf0b4b93519f952223fd89;p=thirdparty%2Fipxe.git

[tg3] Add missing memory barrier

ARM64 has a weaker memory order model than x86.  The missing memory
barrier caused phy initialization notification to be delayed beyond
the link-wait timeout (15 secs).

Signed-off-by: Leendert van Doorn <leendert@paramecium.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
---

diff --git a/src/drivers/net/tg3/tg3.c b/src/drivers/net/tg3/tg3.c
index 824c9b1c0..1bed06649 100644
--- a/src/drivers/net/tg3/tg3.c
+++ b/src/drivers/net/tg3/tg3.c
@@ -486,6 +486,8 @@ static void tg3_poll(struct net_device *dev)
 	 */
 	tp->hw_status->status &= ~SD_STATUS_UPDATED;
 
+	mb();
+
 	tg3_poll_link(tp);
 	tg3_tx_complete(dev);
 	tg3_rx_complete(dev);