linux-kernel - Re: [PATCH] net: dsa: b53: mmap: fix device tree support

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Message-ID: <20230315000657.1ab9d9f4@kernel.org>
Date:   Wed, 15 Mar 2023 00:06:57 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Álvaro Fernández Rojas <noltari@...il.com>
Cc:     f.fainelli@...il.com, jonas.gorski@...il.com, andrew@...n.ch,
        olteanv@...il.com, davem@...emloft.net, edumazet@...gle.com,
        pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: dsa: b53: mmap: fix device tree support

On Fri, 10 Mar 2023 13:10:59 +0100 Álvaro Fernández Rojas wrote:
> diff --git a/drivers/net/dsa/b53/b53_mmap.c b/drivers/net/dsa/b53/b53_mmap.c
> index e968322dfbf0..24ea2e19dfa6 100644
> --- a/drivers/net/dsa/b53/b53_mmap.c
> +++ b/drivers/net/dsa/b53/b53_mmap.c
> @@ -263,7 +263,7 @@ static int b53_mmap_probe_of(struct platform_device *pdev,
>  		if (of_property_read_u32(of_port, "reg", &reg))
>  			continue;
>  
> -		if (reg < B53_CPU_PORT)
> +		if (reg <= B53_CPU_PORT)
>  			pdata->enabled_ports |= BIT(reg);

Should we switch to B53_N_PORTS instead?
That's the bound used by the local "for each port" macro:

#define b53_for_each_port(dev, i) \      
        for (i = 0; i < B53_N_PORTS; i++) \
                if (dev->enabled_ports & BIT(i))