linux-kernel - Re: [PATCH 6/6] spi : use class iteration api

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Message-Id: <200801212341.50999.david-b@pacbell.net>
Date:	Mon, 21 Jan 2008 23:41:50 -0800
From:	David Brownell <david-b@...bell.net>
To:	Dave Young <hidave.darkstar@...il.com>
Cc:	gregkh@...e.de, linux-kernel@...r.kernel.org,
	spi-devel-general@...ts.sourceforge.net
Subject: Re: [PATCH 6/6] spi : use class iteration api

On Monday 21 January 2008, Dave Young wrote:
> Convert to use the class iteration api.
> 
> Signed-off-by: Dave Young <hidave.darkstar@...il.com> 

Ack.


> ---
>  drivers/spi/spi.c |   24 ++++++++++++++----------
>  1 file changed, 14 insertions(+), 10 deletions(-)
> 
> diff -upr linux/drivers/spi/spi.c linux.new/drivers/spi/spi.c
> --- linux/drivers/spi/spi.c	2008-01-22 15:09:49.000000000 +0800
> +++ linux.new/drivers/spi/spi.c	2008-01-22 15:09:49.000000000 +0800
> @@ -485,6 +485,15 @@ void spi_unregister_master(struct spi_ma
>  }
>  EXPORT_SYMBOL_GPL(spi_unregister_master);
>  
> +static int __spi_master_match(struct device *dev, void *data)
> +{
> +	struct spi_master *m;
> +	u16 *bus_num = data;
> +
> +	m = container_of(dev, struct spi_master, dev);
> +	return m->bus_num == *bus_num;
> +}
> +
>  /**
>   * spi_busnum_to_master - look up master associated with bus_num
>   * @bus_num: the master's bus number
> @@ -499,17 +508,12 @@ struct spi_master *spi_busnum_to_master(
>  {
>  	struct device		*dev;
>  	struct spi_master	*master = NULL;
> -	struct spi_master	*m;
>  
> -	down(&spi_master_class.sem);
> -	list_for_each_entry(dev, &spi_master_class.children, node) {
> -		m = container_of(dev, struct spi_master, dev);
> -		if (m->bus_num == bus_num) {
> -			master = spi_master_get(m);
> -			break;
> -		}
> -	}
> -	up(&spi_master_class.sem);
> +	dev = class_find_device(&spi_master_class, &bus_num,
> +				__spi_master_match);
> +	if (dev)
> +		master = container_of(dev, struct spi_master, dev);
> +	/* reference got in class_find_device */
>  	return master;
>  }
>  EXPORT_SYMBOL_GPL(spi_busnum_to_master);
> 


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