linux-kernel - [Patch V3] bonding: fix potential deadlock in bond

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Message-ID: <4BB44BAC.2070304@redhat.com>
Date:	Thu, 01 Apr 2010 15:30:52 +0800
From:	Cong Wang <amwang@...hat.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	linux-kernel@...r.kernel.org, Jiri Pirko <jpirko@...hat.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	bonding-devel@...ts.sourceforge.net,
	Jay Vosburgh <fubar@...ibm.com>
Subject: [Patch V3] bonding: fix potential deadlock in bond_uninit()

Eric W. Biederman wrote:
> Amerigo Wang <amwang@...hat.com> writes:
> 
>> bond_uninit() is invoked with rtnl_lock held, when it does destroy_workqueue()
>> which will potentially flush all works in this workqueue, if we hold rtnl_lock
>> again in the work function, it will deadlock.
>>
>> So move destroy_workqueue() to destructor where rtnl_lock is not held any more,
>> suggested by Eric.
> 
> The error handling on creating a bond device needs to be updated as well.
> 

Done.


View attachment "drivers-net-bonding-bond_main_c-fix-destroy_workqueue-deadlock.diff" of type "text/x-patch" (2518 bytes)