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Message-ID: <1f131230-56a5-4547-bc77-c508e61e8a55@lunn.ch>
Date: Thu, 25 Apr 2024 00:45:35 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Geert Uytterhoeven <geert+renesas@...der.be>
Cc: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>,
Sergey Shtylyov <s.shtylyov@....ru>,
Paul Barker <paul.barker.ct@...renesas.com>,
Niklas Söderlund <niklas.soderlund+renesas@...natech.se>,
"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-renesas-soc@...r.kernel.org
Subject: Re: [PATCH] net: ravb: Fix registered interrupt names
On Wed, Apr 24, 2024 at 09:45:21AM +0200, Geert Uytterhoeven wrote:
> As interrupts are now requested from ravb_probe(), before calling
> register_netdev(), ndev->name still contains the template "eth%d",
> leading to funny names in /proc/interrupts. E.g. on R-Car E3:
>
> 89: 0 0 GICv2 93 Level eth%d:ch22:multi
> 90: 0 3 GICv2 95 Level eth%d:ch24:emac
> 91: 0 23484 GICv2 71 Level eth%d:ch0:rx_be
> 92: 0 0 GICv2 72 Level eth%d:ch1:rx_nc
> 93: 0 13735 GICv2 89 Level eth%d:ch18:tx_be
> 94: 0 0 GICv2 90 Level eth%d:ch19:tx_nc
>
> Worse, on platforms with multiple RAVB instances (e.g. R-Car V4H), all
> interrupts have similar names.
>
> Fix this by using the device name instead, like is done in several other
> drivers:
>
> 89: 0 0 GICv2 93 Level e6800000.ethernet:ch22:multi
> 90: 0 1 GICv2 95 Level e6800000.ethernet:ch24:emac
> 91: 0 28578 GICv2 71 Level e6800000.ethernet:ch0:rx_be
> 92: 0 0 GICv2 72 Level e6800000.ethernet:ch1:rx_nc
> 93: 0 14044 GICv2 89 Level e6800000.ethernet:ch18:tx_be
> 94: 0 0 GICv2 90 Level e6800000.ethernet:ch19:tx_nc
>
> Rename the local variable dev_name, as it shadows the dev_name()
> function, and pre-initialize it, to simplify the code.
Another option is to call dev_alloc_name() soon after alloc_netdev(),
to give the device its name earlier than register_netdev().
Andrew
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