linux-kernel - Re: [PATCH 2/2] net/dl2k: Don't reconfigure link @100Mbps when disabling autoneg @1Gbps

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Message-ID: <BANLkTik5Uc8yRRHoNMENkQNeAnovLYcZjQ@mail.gmail.com>
Date:	Tue, 10 May 2011 15:14:59 -0700
From:	David Decotigny <decot@...gle.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	Giuseppe Cavallaro <peppe.cavallaro@...com>,
	"David S. Miller" <davem@...emloft.net>,
	Joe Perches <joe@...ches.com>,
	Stanislaw Gruszka <sgruszka@...hat.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] net/dl2k: Don't reconfigure link @100Mbps when
 disabling autoneg @1Gbps

Hi all,

Yes, right, I will send the updated patch together with the stmmac
update (if any).

I just hope that changing the netdev_private fields without committing
to hardware and before calling netif_carrier_off() will not create too
much confusion. I don't think so, but I still wish I could test.

Regards,

--
David Decotigny



On Tue, May 10, 2011 at 11:55 AM, Ben Hutchings
<bhutchings@...arflare.com> wrote:
> On Mon, 2011-05-09 at 17:19 -0700, David Decotigny wrote:
>> The initial version of the driver used to force the link to 100Mbps
>> when auto-negociation was disabled on a 1Gbps link, ignoring the
>> requested link speed. Instead, this change refuses to change anything
>> when it is asked to configure the link speed at 1Gbps without
>> auto-negociation, but acts as requested in all the other cases.
>>
>> IMPORTANT: Previously, the return value from mii_set_media() was
>>            ignored. This patch uses it for its own return value.
>>
>> Tested: module compiling, NOT tested on real hardware.
>> Signed-off-by: David Decotigny <decot@...gle.com>
> [...]
>
> The changes to validation look fine.  However, I noticed that there's a
> call to netif_carrier_off() at the top of this function.  This means
> that in the error and shortcut cases, the interface will be left
> disabled!  It's an existing bug but might be made slightly worse by this
> change.
>
> Please also move the call to netif_carrier_off() down to the end, just
> before the call to mii_set_media() which actually alters the link.
>
> Ben.
>
> --
> Ben Hutchings, Senior Software Engineer, Solarflare
> Not speaking for my employer; that's the marketing department's job.
> They asked us to note that Solarflare product names are trademarked.
>
>
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