netdev - Re: [PATCH] net: ravb: Fix registered interrupt names

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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