netdev - Re: [PATCH] vmxnet3: avoid calling pskb_may

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Message-ID: <alpine.DEB.2.02.1603111141020.7592@shri-linux.eng.vmware.com>
Date:	Fri, 11 Mar 2016 11:41:42 -0800 (PST)
From:	Shrikrishna Khare <skhare@...are.com>
To:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
cc:	nhorman@...driver.com, davem@...emloft.net, netdev@...r.kernel.org,
	pv-drivers@...are.com
Subject: Re: [PATCH] vmxnet3: avoid calling pskb_may_pull with interrupts
 disabled



On Fri, 11 Mar 2016, Tetsuo Handa wrote:

> Neil Horman wrote:
> > On Mon, Mar 07, 2016 at 03:16:14PM -0500, David Miller wrote:
> > > From: Neil Horman <nhorman@...driver.com>
> > > Date: Fri,  4 Mar 2016 13:40:48 -0500
> 
> This patch is calling spin_unlock_irqrestore() without spin_lock_irqsave().
> 
> In file included from include/linux/seqlock.h:35:0,
>                  from include/linux/time.h:5,
>                  from include/linux/stat.h:18,
>                  from include/linux/module.h:10,
>                  from drivers/net/vmxnet3/vmxnet3_drv.c:27:
> drivers/net/vmxnet3/vmxnet3_drv.c: In function 'vmxnet3_xmit_frame':
> include/linux/spinlock.h:246:30: warning: 'flags' may be used uninitialized in this function [-Wmaybe-uninitialized]
>    _raw_spin_unlock_irqrestore(lock, flags); \
>                               ^
> drivers/net/vmxnet3/vmxnet3_drv.c:977:16: note: 'flags' was declared here
>   unsigned long flags;
>                 ^
> 
> vmxnet3_tq_xmit(struct sk_buff *skb, struct vmxnet3_tx_queue *tq,
>                 struct vmxnet3_adapter *adapter, struct net_device *netdev)
> {
> (...snipped...)
> 		goto hdr_too_big;
> (...snipped...)
> 	spin_lock_irqsave(&tq->tx_lock, flags);
> (...snipped...)
> 	spin_unlock_irqrestore(&tq->tx_lock, flags);
> (...snipped...)
> 	return NETDEV_TX_OK;
> (...snipped...)
> hdr_too_big:
>         tq->stats.drop_oversized_hdr++;
> unlock_drop_pkt:
>         spin_unlock_irqrestore(&tq->tx_lock, flags);
> (...snipped...)
> 	return NETDEV_TX_OK;
> }
> 
Thank you for reporting this. Will send out a fix later today.