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[regression] e100: PCI wake-up handling rework causes "Error clearing wake event"

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[view original message]
From: Frans Pop
Subject: [regression] e100: PCI wake-up handling rework causes "Error clearing wake event"
Date: Monday, September 8, 2008 - 11:12 pm

(Resending because of error in mail headers in previous attempt; sorry)

On my Toshiba Satellite A40 with 2.6.27-rc4/5 I noticed the following 
error in the boot log (not there with 2.6.26):
e100: 0000:01:08.0: e100_probe: Error clearing wake event

Bisection has fingered the following patch as the cause of the message.

commit eb9d0fe40e313c0a74115ef456a2e43a6c8da72f
Author: Rafael J. Wysocki <rjw@sisk.pl>
Date:   Mon Jul 7 03:34:48 2008 +0200
    PCI ACPI: Rework PCI handling of wake-up

The test this error originates from in drivers/net/e100.c is old and has 
not changed recently.

Surrounding messages (full dmesg attached):
e100: Intel(R) PRO/100 Network Driver, 3.5.23-k4-NAPI
e100: Copyright(c) 1999-2006 Intel Corporation
e100 0000:01:08.0: PCI INT A -> GSI 20 (level, low) -> IRQ 20
e100: 0000:01:08.0: e100_probe: Error clearing wake event
e100: eth0: e100_probe: addr 0xcffff000, irq 20, MAC addr 
00:08:0d:17:bf:f5

The NIC is:
01:08.0 Ethernet controller [0200]: Intel Corporation 82801DB PRO/100 VE 
(MOB) Ethernet Controller [8086:103d] (rev 83)
        Kernel driver in use: e100

Cheers,
FJP


[ message continues ]
[view original message]
From: Rafael J. Wysocki
Subject: [PATCH] e100: Use pci_pme_active for clearing wake-up events and disabling PME# (was: Re: [regression] e100: PCI wake-up handling rework causes "Error clearing wake event")
Date: Tuesday, September 9, 2008 - 6:14 am

The message is actually harmless, but I agree that it's confusing.

The appended patch should fix the problem (ISTR sending it some time ago
already).

Thanks,
Rafael

---
From: Rafael J. Wysocki <rjw@sisk.pl>

e100: Use pci_pme_active for clearing wake-up events and disabling PME#

Currently e100 uses pci_enable_wake() to clear pending wake-up events
and disable PME# during intitialization, but that function is not
suitable for this purpose, because it immediately returns error code
if device_may_wakeup() returns false for given device.

Make e100 use pci_pme_active(), which carries out exactly the
required operations, instead.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
---
 drivers/net/e100.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

Index: linux-2.6/drivers/net/e100.c
===================================================================
--- linux-2.6.orig/drivers/net/e100.c
+++ linux-2.6/drivers/net/e100.c
@@ -2738,9 +2738,7 @@ static int __devinit e100_probe(struct p
 		nic->flags |= wol_magic;
 
 	/* ack any pending wake events, disable PME */
-	err = pci_enable_wake(pdev, 0, 0);
-	if (err)
-		DPRINTK(PROBE, ERR, "Error clearing wake event\n");
+	pci_pme_active(pdev, false);
 
 	strcpy(netdev->name, "eth%d");
 	if((err = register_netdev(netdev))) {
--


[ message continues ]
[view original message]
From: Frans Pop
Subject: Re: [PATCH] e100: Use pci_pme_active for clearing wake-up events and disabling PME#
Date: Tuesday, September 9, 2008 - 9:01 am

Patch works for me.


Tested-by: Frans Pop <elendil@planet.nl>
--


[ message continues ]
[view original message]
From: Andrew Morton
Subject: Re: [PATCH] e100: Use pci_pme_active for clearing wake-up events and disabling PME# (was: Re: [regression] e100: PCI wake-up handling rework causes "Error clearing wake event")
Date: Wednesday, September 10, 2008 - 3:31 pm

On Tue, 9 Sep 2008 15:14:22 +0200

This change is already included in

e100-adapt-to-the-reworked-pci-pm.patch:

  From: "Rafael J. Wysocki" <rjw@sisk.pl>
  
  Adapt the e100 driver to the reworked PCI PM
  
  * Use device_set_wakeup_enable() and friends as needed
  * Use pci_pme_active() to clear PME_Status and disable PME#
  * Use the observation that it is sufficient to call pci_enable_wake()
    once, unless it fails
  
  Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
  Tested-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
  Acked-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
  Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
  Cc: Jeff Garzik <jeff@garzik.org>
  Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
  

which I sent to Jeff on Aug 20 as a for-2.6.28 thing.

Maybe I should just mark e100-adapt-to-the-reworked-pci-pm.patch as a
for-2.6.27 thing next time I send that (large) pile of maybe-for-2.6.27
netdev patches.

e100-adapt-to-the-reworked-pci-pm.patch
drivers-net-skfp-pmfc-use-offsetof-macro.patch
drivers-net-atl1e-dont-take-the-mdio_lock-in-atl1e_probe.patch
e1000e-prevent-corruption-of-eeprom-nvm.patch
drivers-net-mlx4-allocc-needs-mmh.patch
net-forcedeth-call-restore-mac-addr-in-nv_shutdown-path-v2.patch
ehea-fix-dlpar-memory-handling.patch
nec-fix-rmmod-platform-driver-improvements.patch
nec-fix-suspend-and-resume-for-isa-pnp-cards.patch

--


[ message continues ]
[view original message]
From: Rafael J. Wysocki
Subject: Re: [PATCH] e100: Use pci_pme_active for clearing wake-up events and disabling PME# (was: Re: [regression] e100: PCI wake-up handling rework causes "Error clearing wake event")
Date: Wednesday, September 10, 2008 - 4:07 pm

--


[ message continues ]
Previous thread: [PATCH][kgdb] Make mem access function weak in kgdb.c. by sonic zhang on Monday, September 8, 2008 - 11:03 pm. (2 messages)

Next thread: [PATCH] x86: fix HPET compiler error when not using CONFIG_PCI_MSI by Steven Noonan on Monday, September 8, 2008 - 4:19 pm. (9 messages)