netdev - RE: [Pv-drivers] [PATCH] vmxnet3: Consistently disable irqs when taking adapter->cmd

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Date:	Fri, 6 May 2011 13:10:29 -0700
From:	Scott Goldman <scottjg@...are.com>
To:	Shreyas Bhatewara <sbhatewara@...are.com>,
	Roland Dreier <roland@...nel.org>
CC:	"pv-drivers@...are.com" <pv-drivers@...are.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: RE: [Pv-drivers] [PATCH] vmxnet3: Consistently disable irqs when
 taking adapter->cmd_lock

> 
> On Fri, 6 May 2011, Roland Dreier wrote:
> 
> > From: Roland Dreier <roland@...estorage.com>
> >
> > Using the vmxnet3 driver produces a lockdep warning because
> 
> > Signed-off-by: Roland Dreier <roland@...estorage.com>
> 
> 
> Roland, thanks for the analysis and the patch.
> 
> Signed-off-by: Shreyas N Bhatewara <sbhatewara@...are.com>

Likewise, seems pretty sane to me. The command register operations are only control-path operations and disabling interrupts for the duration is probably not a big deal. Touching the cmd reg will result a VMEXIT, where the guest won't be processing interrupts anyway. 

Signed-off-by: Scott J. Goldman <scottjg@...are.com>

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