linux-kernel - Re: Regression in 2.6.27-rc7: Wake On LAN with sky2 broken

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Message-Id: <200809252238.01656.rjw@sisk.pl>
Date:	Thu, 25 Sep 2008 22:38:01 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Tino Keitel <tino.keitel@....de>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: Regression in 2.6.27-rc7: Wake On LAN with sky2 broken

On Thursday, 25 of September 2008, Tino Keitel wrote:
> Hi,
> 
> I just found a method how I can enable WOL again:
> 
> echo enabled >
> /sys/devices/pci0000:00/0000:00:1c.0/0000:01:00.0/power/wakeup
> 
> This device is the NIC device, of cause.

I guess the box didn't hang during suspend with this setting?

If that's correct, please test the patch below.

> I already had another case (EHCI) where I needed to do this to be able
> to wake the computer up with the USB keyboard. It seems like 2.6.27
> behaves different here compared to 2.6.26, and things that worked with
> 2.6.26 need manual fixing to work again. Or did I make something wrong?

No, you didn't.

The behavior was changed by the PCI wake-up patches that fixed a couple of
problems and I'd like to fix all of the cases when the new behavior causes
issues like this to happen.

I'll send you a patch for the EHCI case later today.

Thanks,
Rafael

---
sky2: Fix WOL regression

Since dev->power.should_wakeup bit is used by the PCI core to
decide whether the device should wake up the system from sleep
states, set/unset this bit whenever WOL is enabled/disabled using
sky2_set_wol().

Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---

 drivers/net/sky2.c |   34 ++++++++++------------------------
 1 file changed, 10 insertions(+), 24 deletions(-)

diff -puN drivers/net/sky2.c~skty2-adapt-to-the-reworked-pci-pm drivers/net/sky2.c
--- a/drivers/net/sky2.c~skty2-adapt-to-the-reworked-pci-pm
+++ a/drivers/net/sky2.c
@@ -3034,7 +3034,8 @@ static int sky2_set_wol(struct net_devic
 	struct sky2_port *sky2 = netdev_priv(dev);
 	struct sky2_hw *hw = sky2->hw;
 
-	if (wol->wolopts & ~sky2_wol_supported(sky2->hw))
+	if ((wol->wolopts & ~sky2_wol_supported(sky2->hw))
+	    || !device_can_wakeup(&hw->pdev->dev))
 		return -EOPNOTSUPP;
 
 	sky2->wol = wol->wolopts;
@@ -3045,6 +3046,8 @@ static int sky2_set_wol(struct net_devic
 		sky2_write32(hw, B0_CTST, sky2->wol
 			     ? Y2_HW_WOL_ON : Y2_HW_WOL_OFF);
 
+	device_set_wakeup_enable(&hw->pdev->dev, sky2->wol);
+
 	if (!netif_running(dev))
 		sky2_wol_init(sky2);
 	return 0;
@@ -4314,7 +4305,7 @@ static int __devinit sky2_probe(struct p
 		}
 	}
 
-	wol_default = pci_wake_enabled(pdev) ? WAKE_MAGIC : 0;
+	wol_default = device_may_wakeup(&pdev->dev) ? WAKE_MAGIC : 0;
 
 	err = -ENOMEM;
 	hw = kzalloc(sizeof(*hw), GFP_KERNEL);

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