netdev - Re: [PATCH net-next v3 06/10] net: dsa: Migrate to device_find

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Date:   Sun, 15 Jan 2017 12:06:28 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     netdev@...r.kernel.org, Jason Cooper <jason@...edaemon.net>,
        Andrew Lunn <andrew@...n.ch>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Gregory Clement <gregory.clement@...e-electrons.com>,
        Russell King <linux@...linux.org.uk>,
        Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        "David S. Miller" <davem@...emloft.net>,
        "moderated list:ARM SUB-ARCHITECTURES" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next v3 06/10] net: dsa: Migrate to
 device_find_class()

On Sat, Jan 14, 2017 at 01:47:09PM -0800, Florian Fainelli wrote:
> Now that the base device driver code provides an identical
> implementation of dev_find_class() utilize device_find_class() instead
> of our own version of it.
> 
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---
>  net/dsa/dsa.c | 22 ++--------------------
>  1 file changed, 2 insertions(+), 20 deletions(-)
> 
> diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
> index 2306d1b87c83..77fa4c4f5828 100644
> --- a/net/dsa/dsa.c
> +++ b/net/dsa/dsa.c
> @@ -455,29 +455,11 @@ EXPORT_SYMBOL_GPL(dsa_switch_resume);
>  #endif
>  
>  /* platform driver init and cleanup *****************************************/
> -static int dev_is_class(struct device *dev, void *class)
> -{
> -	if (dev->class != NULL && !strcmp(dev->class->name, class))
> -		return 1;
> -
> -	return 0;
> -}
> -
> -static struct device *dev_find_class(struct device *parent, char *class)
> -{
> -	if (dev_is_class(parent, class)) {
> -		get_device(parent);
> -		return parent;
> -	}
> -
> -	return device_find_child(parent, class, dev_is_class);
> -}
> -
>  struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
>  {
>  	struct device *d;
>  
> -	d = dev_find_class(dev, "mdio_bus");
> +	d = device_find_class(dev, "mdio_bus");
>  	if (d != NULL) {
>  		struct mii_bus *bus;

You want a peer of your device on a specific class?  What is this for?

> @@ -495,7 +477,7 @@ static struct net_device *dev_to_net_device(struct device *dev)
>  {
>  	struct device *d;
>  
> -	d = dev_find_class(dev, "net");
> +	d = device_find_class(dev, "net");
>  	if (d != NULL) {
>  		struct net_device *nd;

Again, huh?  What is the device heirachy here that is so odd that this
type of function is needed?

totally confused,

greg k-h