linux-kernel - Re: [PATCH 2/2] drivers/net: fixed drivers that support netpoll use ndo_start

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Message-Id: <20090823.195007.192261442.davem@davemloft.net>
Date:	Sun, 23 Aug 2009 19:50:07 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	Dongdong.deng@...driver.com
Cc:	mpm@...enic.com, nico@....org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, jason.wessel@...driver.com
Subject: Re: [PATCH 2/2] drivers/net: fixed drivers that support netpoll
 use ndo_start_xmit()

From: DDD <Dongdong.deng@...driver.com>
Date: Fri, 21 Aug 2009 21:34:53 +0800

> The NETPOLL API requires that interrupts remain disabled in
> netpoll_send_skb(). The use of "A functions set" in the NETPOLL API
> callbacks causes the interrupts to get enabled and can lead to kernel
> instability.
> 
> The solution is to use "B functions set" to prevent the irqs from
> getting enabled while in netpoll_send_skb().
> 
> A functions set:
> local_irq_disable()/local_irq_enable()
> spin_lock_irq()/spin_unlock_irq()
> spin_trylock_irq()/spin_unlock_irq()
> 
> B functions set:
> local_irq_save()/local_irq_restore()
> spin_lock_irqsave()/spin_unlock_irqrestore()
> spin_trylock_irqsave()/spin_unlock_irqrestore()
> 
> Signed-off-by: Dongdong Deng <dongdong.deng@...driver.com>

Applied.
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