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Message-ID: <47029606.1080104@colorfullife.com>
Date: Tue, 02 Oct 2007 21:03:34 +0200
From: Manfred Spraul <manfred@...orfullife.com>
To: Ayaz Abdulla <aabdulla@...dia.com>
CC: Jeff Garzik <jgarzik@...ox.com>, nedev <netdev@...r.kernel.org>,
linux-kernel@...r.kernel.org
Subject: Re: MSI interrupts and disable_irq
Ayaz Abdulla wrote:
> I am trying to track down a forcedeth driver issue described by bug
> 9047 in bugzilla (2.6.23-rc7-git1 forcedeth w/ MCP55 oops under heavy
> load). I added a patch to synchronize the timer handlers so that one
> handler doesn't accidently enable the IRQ while another timer handler
> is running (see attachment 'Add timer lock' in bug report) and for
> other processing protection.
>
> However, the system still had an Oops. So I added a lock around the
> nv_rx_process_optimized() and the Oops has not happened (see
> attachment 'New patch for locking' in bug report). This would imply a
> synchronization issue. However, the only callers of that function are
> the IRQ handler and the timer handlers (in non-NAPI case). The timer
> handlers use disable_irq so that the IRQ handler does not contend
> with them. It looks as if disable_irq is not working properly.
Either disable_irq() is not working properly or interrupts are nested,
i.e. the irq handler is called again while running.
Which timer handler do you mean? I only see disable_irq() in the
configuration paths (set mtu, change ring size, ...) and in the tx
timeout case.
Neither one should happen during normal operation.
--
Manfred
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