Re: [PATCH 2/2] drivers/net: fixed drivers that support netpolluse ndo_start_xmit()

[David Miller]

From: DDD <Dongdong.deng@xxxxxxxxxxxxx>
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@xxxxxxxxxxxxx>

Applied.
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