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To: Mateusz Berezecki <mateuszb@gmail.com>
Subject: Re: NIC irq nobody cared ? virtual to  physical  and DMA questions
Date: Tue, 29 Nov 2005 22:05:58 +0100
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Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
       kernel-mentors@selenic.com
References: <745843498.20051129212851@gmail.com>
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Message-Id: <200511292206.02147.IvDoorn@gmail.com>
From: Ivo van Doorn <ivdoorn@gmail.com>
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Hi,

> This time the questions are different.
>=20
> Given the following output could anyone please tell me what is wrong ?
> In explicit what does that mysterious "nobody cared" message mean?
> And another stupid question: should DMA for a network card be enabled bef=
ore or maybe
> _after_ interrupts get enabled? And... how to convert virtual address
> to physical one?

The nobody cared error message is reported when a device is raising interru=
pts while
the actual driver has not yet registered the interrupt handler.

The best way to handle this for network drivers (done in rt2x00, which work=
s fine) would be:

1 - Allocate DMA
2 - Registers interrupt handler
3 - Enable device interrupts.

IvD

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