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

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Message-Id: <20131029.224227.1700872646112764527.davem@davemloft.net>
Date:	Tue, 29 Oct 2013 22:42:27 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	tdmackey@...leanhaiku.com
Cc:	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: 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.

Therefore, bnx2_tx_int(), which is invoked from the driver's ->poll()
method, should not need to use dev_kfree_skb_any().  The real problem
is somewhere else.
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