linux-kernel - Re: [2.6.37-rc1, patch v2] r8169: fix sleeping while holding spinlock...

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Message-ID: <AANLkTinzQGzsUGgzrhFo8eS1_OcnkVDOXRuc1C=0nMx=@mail.gmail.com>
Date:	Tue, 2 Nov 2010 00:17:13 +0000
From:	Daniel J Blueman <daniel.blueman@...il.com>
To:	Francois Romieu <romieu@...zoreil.com>,
	"David S. Miller" <davem@...emloft.net>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [2.6.37-rc1, patch v2] r8169: fix sleeping while holding spinlock...

Hi Francois,

On 1 November 2010 23:46, Francois Romieu <romieu@...zoreil.com> wrote:
> Daniel J Blueman <daniel.blueman@...il.com> :
>> Recent changes to the r8169 driver cause it to call
>> device_set_wakeup_enable under spinlock, which may sleep.
>
> The change is fine but the description is misleading : the r8169
> driver has been issuing device_set_wakeup_enable under spinlock since
> october 2008. device_set_wakeup_enable did not sleep until recently
> (see f2dc0d1809ab7e0147c7e4ac837be1682f706538 for instance).

Good catch; I also find that only the gainfar is the other driver
needing fixing; I'll follow up with this.

Patch with updated description for David:

As device_set_wakeup_enable can now sleep, move the call to outside
the critical section.

Signed-off-by: Daniel J Blueman <daniel.blueman@...il.com>

diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c
index d88ce9f..894e7c7 100644
--- a/drivers/net/r8169.c
+++ b/drivers/net/r8169.c
@@ -846,10 +846,10 @@ static int rtl8169_set_wol(struct net_device
*dev, struct ethtool_wolinfo *wol)
 	else
 		tp->features &= ~RTL_FEATURE_WOL;
 	__rtl8169_set_wol(tp, wol->wolopts);
-	device_set_wakeup_enable(&tp->pci_dev->dev, wol->wolopts);
-
 	spin_unlock_irq(&tp->lock);

+	device_set_wakeup_enable(&tp->pci_dev->dev, wol->wolopts);
+
 	return 0;
 }

-- 
Daniel J Blueman
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