linux-kernel - [20/20] igb: Fix lack of flush after register write and before delay

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Message-Id: <20110826220420.862457305@clark.kroah.org>
Date:	Fri, 26 Aug 2011 15:03:43 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Carolyn Wyborny <carolyn.wyborny@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [20/20] igb: Fix lack of flush after register write and before delay

2.6.33-longterm review patch.  If anyone has any objections, please let us know.

------------------

From: Carolyn Wyborny <carolyn.wyborny@...el.com>

commit 064b43304ed8ede8e13ff7b4338d09fd37bcffb1 upstream.

Register writes followed by a delay are required to have a flush
before the delay in order to commit the values to the register.  Without
the flush, the code following the delay may not function correctly.

Reported-by: Tong Ho <tong.ho@...csson.com>
Reported-by: Guenter Roeck <guenter.roeck@...csson.com>
Signed-off-by: Carolyn Wyborny <carolyn.wyborny@...el.com>
Tested-by:  Aaron Brown <aaron.f.brown@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/net/igb/e1000_82575.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/net/igb/e1000_82575.c
+++ b/drivers/net/igb/e1000_82575.c
@@ -1527,6 +1527,7 @@ static s32 igb_reset_hw_82580(struct e10
 		ctrl |= E1000_CTRL_RST;
 
 	wr32(E1000_CTRL, ctrl);
+	wrfl();
 
 	/* Add delay to insure DEV_RST has time to complete */
 	if (global_device_reset)


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