[PATCH] [169/275] r8169: disable ASPM

[Andi Kleen]

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Stanislaw Gruszka <sgruszka@xxxxxxxxxx>

commit ba04c7c93bbcb48ce880cf75b6e9dffcd79d4c7b upstream.

For some time is known that ASPM is causing troubles on r8169, i.e. make
device randomly stop working without any errors in dmesg.

Currently Tomi Leppikangas reports that system with r8169 device hangs
with MCE errors when ASPM is enabled:
https://bugzilla.redhat.com/show_bug.cgi?id=642861#c4

Lets disable ASPM for r8169 devices at all, to avoid problems with
r8169 PCIe devices at least for some users.

Reported-by: Tomi Leppikangas <tomi.leppikangas@xxxxxxxxx>
Signed-off-by: Stanislaw Gruszka <sgruszka@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>

---
 drivers/net/r8169.c |    6 ++++++
 1 file changed, 6 insertions(+)

Index: linux-2.6.35.y/drivers/net/r8169.c
===================================================================
--- linux-2.6.35.y.orig/drivers/net/r8169.c	2011-03-29 22:50:56.827804337 -0700
+++ linux-2.6.35.y/drivers/net/r8169.c	2011-03-29 23:54:22.174435038 -0700
@@ -24,6 +24,7 @@
 #include <linux/init.h>
 #include <linux/dma-mapping.h>
 #include <linux/pm_runtime.h>
+#include <linux/pci-aspm.h>
 
 #include <asm/system.h>
 #include <asm/io.h>
@@ -3040,6 +3041,11 @@
 	mii->reg_num_mask = 0x1f;
 	mii->supports_gmii = !!(cfg->features & RTL_FEATURE_GMII);
 
+	/* disable ASPM completely as that cause random device stop working
+	 * problems as well as full system hangs for some PCIe devices users */
+	pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1 |
+				     PCIE_LINK_STATE_CLKPM);
+
 	/* enable device (incl. PCI PM wakeup and hotplug setup) */
 	rc = pci_enable_device(pdev);
 	if (rc < 0) {
--
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