linux-kernel - Re: [PATCH] bonding: Fix sysfs attribute handling

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Message-ID: <27198.10.20.10.50.1206302705.squirrel@webmail.suse.cz>
Date:	Sun, 23 Mar 2008 21:05:05 +0100 (CET)
From:	lpechacek@...e.cz
To:	"Jay Vosburgh" <fubar@...ibm.com>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Libor Pechacek" <lpechacek@...e.cz>,
	bonding-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, stable@...nel.org
Subject: Re: [PATCH] bonding: Fix sysfs attribute handling

> Andrew Morton <akpm@...ux-foundation.org> wrote:
>
>>On Fri, 21 Mar 2008 14:52:55 +0100 Libor Pechacek <lpechacek@...e.cz>
>> wrote:
>>
>>> bonding: Fix sysfs attribute handling
>>>
>>> For bonding interfaces any attempt to read the sysfs directory contents
>>> after
>>> module removal results in an oops.  The fix is to release sysfs
>>> attributes
>>> for the interfaces upon module unload.
>>>
>>> Signed-off-by: Libor Pechacek <lpechacek@...e.cz>
>>> --
>>>  drivers/net/bonding/bond_main.c |    3 +--
>>>  1 files changed, 1 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/net/bonding/bond_main.c
>>> b/drivers/net/bonding/bond_main.c
>>> index 0942d82..33767d4 100644
>>> --- a/drivers/net/bonding/bond_main.c
>>> +++ b/drivers/net/bonding/bond_main.c
>>> @@ -4528,8 +4528,7 @@ static void bond_free_all(void)
>>>  		netif_tx_unlock_bh(bond_dev);
>>>  		/* Release the bonded slaves */
>>>  		bond_release_all(bond_dev);
>>> -		bond_deinit(bond_dev);
>>> -		unregister_netdevice(bond_dev);
>>> +		bond_destroy(bond);
>>>  	}
>>
>>Is this also needed in 2.6.24.x?
>
> 	Yes (I haven't tested it personally, but the affected code is
> the same).  I was going to forward this to stable when it was accepted
> upstream.  The oops is fairly straightforward to create:
>
> # modprobe bonding
> # cd /sys/class/net/bond0/bonding
> # rmmod bonding
> # ls

Yes, exactly.

I tested the patch with the latest Linus' tree (GIT commit
49a5ba46c5d1e34bcb07634157b29d7414ce13bd), but I first found the bug in
2.6.16.

Libor

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