netdev - Re: [PATCH] skge: request IRQ on activating the interface

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Date:	Tue, 22 Sep 2009 09:28:26 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Michal Schmidt <mschmidt@...hat.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] skge: request IRQ on activating the interface

On Tue, 22 Sep 2009 14:01:31 +0200
Michal Schmidt <mschmidt@...hat.com> wrote:

> skge requests IRQ in its probe function. This causes a problem in
> the following real-life scenario with two different NICs in the machine:
> 
> 1. modprobe skge
>    The card is detected as eth0 and requests IRQ 17. Directory
>    /proc/irq/17/eth0 is created.
> 2. There is an udev rule which says this interface should be called
>    eth1, so udev renames eth0 -> eth1.
> 3. modprobe 8139too
>    The Realtek card is detected as eth0. It will be using IRQ 17 too.
> 4. ip link set eth0 up
>    Now 8139too requests IRQ 17.
> 
> The result is:
> WARNING: at fs/proc/generic.c:590 proc_register ...
> proc_dir_entry '17/eth0' already registered
> ...
> 
> And "ls /proc/irq/17" shows two subdirectories, both called eth0.
> 
> Fix it by requesting the IRQ in skge when the interface is activated.
> This works, because interfaces can be renamed only while they are down.
> 
> Signed-off-by: Michal Schmidt <mschmidt@...hat.com>

No. because two port cards have a single IRQ for both ports.
The choice of ethX in irq name was done because irqbalance looks for this.
Probably better to change skge/sky2 and other devices with same issue
to use skge-N ... for request_irq, and teach irqbalance how to do deal
with it.
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