netdev - Re: [PATCH] 3c59x: fix incorrect use of spin_lock

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Message-Id: <20131022.025514.1611245390510932009.davem@davemloft.net>
Date:	Tue, 22 Oct 2013 02:55:14 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	mpatocka@...hat.com
Cc:	klassert@...hematik.tu-chemnitz.de, netdev@...r.kernel.org
Subject: Re: [PATCH] 3c59x: fix incorrect use of spin_lock_bh in interrupts

From: Mikulas Patocka <mpatocka@...hat.com>
Date: Mon, 21 Oct 2013 19:53:22 -0400 (EDT)

> The functions mdio_read and mdio_write may be called from interrupt
> context. Consequently, we must use spin_lock_irqsave instead of
> spin_lock_bh.
> 
> This patch should be backported to stable kernels.

vortex_down() does a lot of other things which are really dangerous
from an interrupt handler, such as del_timer_sync().

The real fix for this bug is to defer the vortex_error() work into
a workqueue, and thus process context, like every other driver does.
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