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

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Message-Id: <20131030.173200.2256841895208134119.davem@davemloft.net>
Date:	Wed, 30 Oct 2013 17:32:00 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	xiyou.wangcong@...il.com
Cc:	tdmackey@...leanhaiku.com, mchan@...adcom.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bnx2: Use dev_kfree_skb_any() in bnx2_tx_int()

From: Cong Wang <xiyou.wangcong@...il.com>
Date: Wed, 30 Oct 2013 12:23:52 -0700

> On Tue, Oct 29, 2013 at 11:40 PM, David Miller <davem@...emloft.net> wrote:
>> From: Cong Wang <xiyou.wangcong@...il.com>
>> Date: Tue, 29 Oct 2013 20:50:08 -0700
>>
>>> Normally ->poll() is called in softirq context, while netpoll could
>>> be called in any context depending on its caller.
>>
>> It still makes amends to make the execution context still looks
>> "compatible" as far as locking et al. is concerned.
> 
> Adjusting netpoll code for IRQ context is much harder
> than just calling dev_kfree_skb_any()...
> 
> What's more, we have similar change before:
> 
> commit ed79bab847d8e5a2986d8ff43c49c6fb8ee3265f
> Author: Eric Dumazet <eric.dumazet@...il.com>
> Date:   Wed Oct 14 14:36:43 2009 +0000
> 
>     virtio_net: use dev_kfree_skb_any() in free_old_xmit_skbs()

Explain to me then why other ethernet drivers implemented identically,
such as tg3, can use plain dev_kfree_skb() just fine?
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