linux-kernel - Re: linux-next: Tree for May 18 (drivers/net/dsa/qca8k.c)

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Date:   Tue, 18 May 2021 19:43:48 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        John Crispin <john@...ozen.org>,
        Ansuel Smith <ansuelsmth@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: Re: linux-next: Tree for May 18 (drivers/net/dsa/qca8k.c)

Hi Randy,

On Tue, May 18, 2021 at 09:32:49AM -0700, Randy Dunlap wrote:
> On 5/18/21 2:27 AM, Stephen Rothwell wrote:
> > Hi all,
> > 
> > Changes since 20210514:
> > 
> 
> on x86_64:
> # CONFIG_OF is not set
> 
> ../drivers/net/dsa/qca8k.c: In function ‘qca8k_mdio_register’:
> ../drivers/net/dsa/qca8k.c:797:9: error: implicit declaration of function ‘devm_of_mdiobus_register’; did you mean ‘devm_mdiobus_register’? [-Werror=implicit-function-declaration]
>   return devm_of_mdiobus_register(priv->dev, bus, mdio);
> 
> 
> Should there be a stub for this function in <linux/of_mdio.h>?
> or the driver could add a dependency on OF_MDIO.
> 
> Full randconfig file is attached.
> 
> -- 
> ~Randy
> Reported-by: Randy Dunlap <rdunlap@...radead.org>
> 

Would something like this work?

-----------------------------[ cut here ]-----------------------------
>From 36c0b3f04ebfa51e52bd1bc2dc447d12d1c6e119 Mon Sep 17 00:00:00 2001
From: Vladimir Oltean <olteanv@...il.com>
Date: Tue, 18 May 2021 19:39:18 +0300
Subject: [PATCH] net: mdio: provide shim implementation of
 devm_of_mdiobus_register

Similar to the way in which of_mdiobus_register() has a fallback to the
non-DT based mdiobus_register() when CONFIG_OF is not set, we can create
a shim for the device-managed devm_of_mdiobus_register() which calls
devm_mdiobus_register() and discards the struct device_node *.

In particular, this solves a build issue with the qca8k DSA driver which
uses devm_of_mdiobus_register and can be compiled without CONFIG_OF.

Reported-by: Randy Dunlap <rdunlap@...radead.org>
Signed-off-by: Vladimir Oltean <olteanv@...il.com>
---
 include/linux/of_mdio.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/linux/of_mdio.h b/include/linux/of_mdio.h
index 2b05e7f7c238..da633d34ab86 100644
--- a/include/linux/of_mdio.h
+++ b/include/linux/of_mdio.h
@@ -72,6 +72,13 @@ static inline int of_mdiobus_register(struct mii_bus *mdio, struct device_node *
 	return mdiobus_register(mdio);
 }
 
+static inline int devm_of_mdiobus_register(struct device *dev,
+					   struct mii_bus *mdio,
+					   struct device_node *np)
+{
+	return devm_mdiobus_register(dev, mdio);
+}
+
 static inline struct mdio_device *of_mdio_find_device(struct device_node *np)
 {
 	return NULL;
-----------------------------[ cut here ]-----------------------------