linux-kernel - Re: [RFC PATCH v3 1/5] net: dsa: allow switch drivers to cleanup their resources

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Message-ID: <20151029145052.GU2307@lunn.ch>
Date:	Thu, 29 Oct 2015 15:50:52 +0100
From:	Andrew Lunn <andrew@...n.ch>
To:	Neil Armstrong <narmstrong@...libre.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Florian Fainelli <f.fainelli@...il.com>,
	Guenter Roeck <linux@...ck-us.net>,
	vivien.didelot@...oirfairelinux.com,
	Fabian Frederick <fabf@...net.be>,
	Pavel Nakonechny <pavel.nakonechny@...tlab.ru>,
	Joe Perches <joe@...ches.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v3 1/5] net: dsa: allow switch drivers to cleanup
 their resources

On Thu, Oct 29, 2015 at 03:45:24PM +0100, Neil Armstrong wrote:
> Some switch drivers might request interrupts, remap register ranges,
> allow such drivers to implement a "remove" callback doing just that.
> 
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
> ---
>  include/net/dsa.h | 1 +
>  net/dsa/dsa.c     | 4 ++++
>  2 files changed, 5 insertions(+)
> 
> diff --git a/include/net/dsa.h b/include/net/dsa.h
> index 98ccbde..0e1502c 100644
> --- a/include/net/dsa.h
> +++ b/include/net/dsa.h
> @@ -212,6 +212,7 @@ struct dsa_switch_driver {
>  	 */
>  	char	*(*probe)(struct device *host_dev, int sw_addr);
>  	int	(*setup)(struct dsa_switch *ds);
> +	void	(*remove)(struct dsa_switch *ds);
>  	int	(*set_addr)(struct dsa_switch *ds, u8 *addr);
>  	u32	(*get_phy_flags)(struct dsa_switch *ds, int port);
> 
> diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
> index 1eba07f..f462fc5 100644
> --- a/net/dsa/dsa.c
> +++ b/net/dsa/dsa.c
> @@ -459,6 +459,10 @@ static void dsa_switch_destroy(struct dsa_switch *ds)
>  	}
> 
>  	mdiobus_unregister(ds->slave_mii_bus);
> +
> +	/* Leave a chance to the driver to cleanup */
> +	if (ds->drv->remove)
> +		ds->drv->remove(ds);
>  }

https://lkml.org/lkml/2015/10/28/532 ???

     Andrew
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