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

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Date:	Tue, 18 Aug 2009 13:59:26 +0800
From:	DDD <Dongdong.deng@...driver.com>
To:	David Miller <davem@...emloft.net>, mpm@...enic.com
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Bruce.Ashfield@...driver.com, jason.wessel@...driver.com
Subject: Re: [PATCH] drivers/net: fixed drivers that support netpoll use
	ndo_start_xmit()

On Fri, 2009-08-14 at 16:32 -0700, David Miller wrote:
> From: Matt Mackall <mpm@...enic.com>
> Date: Fri, 14 Aug 2009 10:33:39 -0500
> 
> > On Fri, 2009-08-14 at 13:12 +0800, DDD wrote:
> >> The NETPOLL API requires that interrupts remain disabled in
> >> netpoll_send_skb(). The use of spin_lock_irq() and
> spin_unlock_irq()
> >> in the NETPOLL API callbacks causes the interrupts to get enabled
> and
> >> can lead to kernel instability.
> >> 
> >> The solution is to use spin_lock_irqsave() and
> spin_unlock_restore()
> >> to prevent the irqs from getting enabled while in
> netpoll_send_skb().
> ...
> >> Signed-off-by: Dongdong Deng <dongdong.deng@...driver.com>
> >> Signed-off-by: Jason Wessel <jason.wessel@...driver.com>
> >> Acked-by: Bruce Ashfield <bruce.ashfield@...driver.com>
> > 
> > Acked-by: Matt Mackall <mpm@...enic.com>
> 
> Applied, thanks everyone.
Thanks. :-)

> 
> > Perhaps we should also have a WARN_ONCE if start_xmit returns with
> > interrupts enabled?
> 
> Probably a good idea.
I think it is a good idea too, thanks for your suggestion, Matt.
I will do a tiny patch for it shortly.


Dongdong
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