linux-kernel - Re: [PATCH net-next v3 9/9] net: sunhme: Consolidate common probe tasks

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Date:   Tue, 21 Mar 2023 09:00:10 +0100
From:   Simon Horman <simon.horman@...igine.com>
To:     Sean Anderson <seanga2@...il.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v3 9/9] net: sunhme: Consolidate common probe
 tasks

On Sat, Mar 18, 2023 at 10:40:46AM -0400, Sean Anderson wrote:
> On 3/18/23 09:53, Simon Horman wrote:
> > On Mon, Mar 13, 2023 at 08:36:13PM -0400, Sean Anderson wrote:
> > > Most of the second half of the PCI/SBUS probe functions are the same.
> > > Consolidate them into a common function.
> > > 
> > > Signed-off-by: Sean Anderson <seanga2@...il.com>

...

> > > @@ -2511,70 +2576,18 @@ static int happy_meal_sbus_probe_one(struct platform_device *op, int is_qfe)
> > >   		goto err_out_clear_quattro;
> > >   	}
> > > -	hp->hm_revision = of_getintprop_default(dp, "hm-rev", 0xff);
> > > -	if (hp->hm_revision == 0xff)
> > > -		hp->hm_revision = 0xa0;
> > 
> > It's not clear to me that the same value will be set by the call to
> > happy_meal_common_probe(hp, dp, 0); where the logic is:
> > 
> > #ifdef CONFIG_SPARC
> > 	hp->hm_revision = of_getintprop_default(dp, "hm-rev", 0xff);
> > 	if (hp->hm_revision == 0xff)
> > 		hp->hm_revision = 0xc0 | minor_rev;
> 
> OK, so maybe this should be xor, with sbus passing in 0x30.

Maybe moving the math to the caller makes things easier.
I'm unsure.

> > #else
> > 	/* works with this on non-sparc hosts */
> > 	hp->hm_revision = 0x20;
> > #endif
> > 
> > I am assuming that the SPARC logic is run.
> > But another question: is it strictly true that SBUS means SPARC?
> 
> Yes.

Thanks, got it.