[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 824c9b1c06468e4ff1d2dd75b9d6232608d567fd..1bed06649c4e9dcc78ee0485bc8c5a5483f81a38 100644 (file)
--- 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);