netdev - Re: [PATCH] via-velocity: Give RX descriptors to the NIC later on open or MTU change

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Date:	Mon, 28 Dec 2009 10:27:25 +0100
From:	Jan Ceuleers <jan.ceuleers@...puter.org>
To:	David Miller <davem@...emloft.net>
CC:	ben@...adent.org.uk, romieu@...zoreil.com, netdev@...r.kernel.org,
	508527@...s.debian.org
Subject: Re: [PATCH] via-velocity: Give RX descriptors to the NIC later on
 open or MTU change

David Miller wrote:
>> velocity_open() calls velocity_give_many_rx_descs(), which gives RX
>> descriptors to the NIC, before installing an interrupt handler or
>> calling velocity_init_registers().  I think this is very unsafe and it
>> appears to explain the bug report <http://bugs.debian.org/508527>.
>>
>> On MTU change, velocity_give_many_rx_descs() is again called before
>> velocity_init_registers().  I'm not sure whether this is unsafe but
>> it does look wrong.
>>
>> Therefore, move the calls to velocity_give_many_rx_descs() after
>> request_irq() and velocity_init_registers().
>>
>> Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
>> ---
>> This is untested; I don't have this hardware.
> 
> Although this patch looks fine to me, I don't want to apply
> it until someone tests it.

I have successfully booted a 2.6.32.2 kernel with this patch applied on top on a PXE-booting machine with nfsroot. If you consider that to be a sufficient test then please feel free to add my

Tested-by: Jan Ceuleers <jan.ceuleers@...puter.org>

Otherwise, please let me know which other tests you would like me to carry out.

Note though that I am unable to reproduce the original bug on my system.

Cheers, Jan
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