linux-kernel - [68/91] e1000e: disable ASPM L1 on 82573

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Date:	Tue, 24 Aug 2010 15:42:30 -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,
	Bruce Allan <bruce.w.allan@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [68/91] e1000e: disable ASPM L1 on 82573

2.6.34-stable review patch.  If anyone has any objections, please let us know.

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

From: Bruce Allan <bruce.w.allan@...el.com>

commit 19833b5dffe2f2e92a1b377f9aae9d5f32239512 upstream.

On the e1000-devel mailing list, Nils Faerber reported latency issues with
the 82573 LOM on a ThinkPad X60.  It was found to be caused by ASPM L1;
disabling it resolves the latency.  The issue is present in kernels back
to 2.6.34 and possibly 2.6.33.

Reported-by: Nils Faerber <nils.faerber@...nelconcepts.de>
Signed-off-by: Bruce Allan <bruce.w.allan@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/net/e1000e/82571.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/net/e1000e/82571.c
+++ b/drivers/net/e1000e/82571.c
@@ -1826,6 +1826,7 @@ struct e1000_info e1000_82573_info = {
 				  | FLAG_HAS_SMART_POWER_DOWN
 				  | FLAG_HAS_AMT
 				  | FLAG_HAS_SWSM_ON_LOAD,
+	.flags2			= FLAG2_DISABLE_ASPM_L1,
 	.pba			= 20,
 	.max_hw_frame_size	= ETH_FRAME_LEN + ETH_FCS_LEN,
 	.get_variants		= e1000_get_variants_82571,

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