linux-kernel - [PATCH 5/6] SUNHME: Workaround ancient hang on U1's

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Message-Id: <91fcd7d6a83321c37f6769164b1b41ce78a07bfa.1179964369.git.bcollins@ubuntu.com>
Date:	Wed, 23 May 2007 18:30:46 -0400
From:	Ben Collins <bcollins@...ntu.com>
To:	linux-kernel@...r.kernel.org
Cc:	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5/6] SUNHME: Workaround ancient hang on U1's

This work around has been in use by almost any distribution trying to
support sparc64 since at least 2002. Without it, sunhme hangs fairly
quickly on UltraSPARC 1's.

Dave, I know it's not in the kernel because it isn't a "fix", but given
that we haven't seen a fix in more than 5 years, can we get this out of my
tree please? :)

CC: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Collins <bcollins@...ntu.com>
---
 drivers/net/sunhme.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/net/sunhme.c b/drivers/net/sunhme.c
index 51c3fe2..5753298 100644
--- a/drivers/net/sunhme.c
+++ b/drivers/net/sunhme.c
@@ -1969,6 +1969,7 @@ static void happy_meal_tx(struct happy_meal *hp)
 	}
 	hp->tx_old = elem;
 	TXD((">"));
+	udelay(1);

 	if (netif_queue_stopped(dev) &&
 	    TX_BUFFS_AVAIL(hp) > (MAX_SKB_FRAGS + 1))
-- 
1.5.1.4

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