linux-kernel - Re: [PATCH] bnx2: Use dev_kfree_skb_any() in bnx2_tx

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Message-ID: <CAM_iQpXzJOxZ3MFNthKw5ye=WcxDWbiPaHuL=pHMz7D1R4nJ+w@mail.gmail.com>
Date:	Tue, 29 Oct 2013 20:50:08 -0700
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	tdmackey@...leanhaiku.com, mchan@...adcom.com,
	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] bnx2: Use dev_kfree_skb_any() in bnx2_tx_int()

On Tue, Oct 29, 2013 at 7:42 PM, David Miller <davem@...emloft.net> wrote:
> From: David Mackey <tdmackey@...leanhaiku.com>
> Date: Tue, 29 Oct 2013 15:16:38 -0700
>
>> Using dev_kfree_skb_any() will resolve the below issue when a
>> netconsole message is transmitted in an irq.
>  ...
>> Signed-off-by: David Mackey <tdmackey@...leanhaiku.com>
>
> This is absolutely not the correct fix.
>
> The netpoll facility must invoke ->poll() in an environment which
> is compatible, locking and interrupt/soft-interrupt wise, as that
> in which it is normally called.
>

Normally ->poll() is called in softirq context, while netpoll could
be called in any context depending on its caller.

Also, netpoll disables IRQ for tx, which is another difference.
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