linux-kernel - Re: ieee1394: struct device - replace bus_id with dev_name(), dev_set

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Message-ID: <490AB9EF.2060005@s5r6.in-berlin.de>
Date:	Fri, 31 Oct 2008 08:55:27 +0100
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Kay Sievers <kay.sievers@...y.org>
CC:	linux-kernel <linux-kernel@...r.kernel.org>,
	Greg KH <greg@...ah.com>, linux1394-devel@...ts.sourceforge.net
Subject: Re: ieee1394: struct device - replace bus_id with dev_name(),	dev_set_name()

Kay Sievers wrote:
> This patch is part of a larger patch series which will remove
> the "char bus_id[20]" name string from struct device. The device
> name is managed in the kobject anyway, and without any size
> limitation, and just needlessly copied into "struct device".
> 
> To set and read the device name dev_name(dev) and dev_set_name(dev)
> must be used. If your code uses static kobjects, which it shouldn't
> do, "const char *init_name" can be used to statically provide the
> name the registered device should have. At registration time, the
> init_name field is cleared, to enforce the use of dev_name(dev) to
> access the device name at a later time.
> 
> We need to get rid of all occurrences of bus_id in the entire tree
> to be able to enable the new interface. Please apply this patch,
> and possibly convert any remaining remaining occurrences of bus_id.
> 
> We want to submit a patch to -next, which will remove bus_id from
> "struct device", to find the remaining pieces to convert, and finally
> switch over to the new api, which will remove the 20 bytes array
> and does no longer have a size limitation.
> 
> Thanks,
> Kay
> 
> 
> From: Kay Sievers <kay.sievers@...y.org>
> Acked-by: Greg Kroah-Hartman <gregkh@...e.de>
> Subject: ieee1394: struct device - replace bus_id with dev_name(), dev_set_name()
> 
> CC: Stefan Richter <stefanr@...6.in-berlin.de>
> Signed-Off-By: Kay Sievers <kay.sievers@...y.org>
> ---

Committed to linux1394-2.6.git.  Thanks.

> 
> 
> diff --git a/drivers/ieee1394/hosts.c b/drivers/ieee1394/hosts.c
> index 8dd09d8..237d0c9 100644
> --- a/drivers/ieee1394/hosts.c
> +++ b/drivers/ieee1394/hosts.c
> @@ -155,11 +155,11 @@ struct hpsb_host *hpsb_alloc_host(struct hpsb_host_driver *drv, size_t extra,
>  	memcpy(&h->device, &nodemgr_dev_template_host, sizeof(h->device));
>  	h->device.parent = dev;
>  	set_dev_node(&h->device, dev_to_node(dev));
> -	snprintf(h->device.bus_id, BUS_ID_SIZE, "fw-host%d", h->id);
> +	dev_set_name(&h->device, "fw-host%d", h->id);
>  
>  	h->host_dev.parent = &h->device;
>  	h->host_dev.class = &hpsb_host_class;
> -	snprintf(h->host_dev.bus_id, BUS_ID_SIZE, "fw-host%d", h->id);
> +	dev_set_name(&h->host_dev, "fw-host%d", h->id);
>  
>  	if (device_register(&h->device))
>  		goto fail;
> diff --git a/drivers/ieee1394/nodemgr.c b/drivers/ieee1394/nodemgr.c
> index 2376b72..9e39f73 100644
> --- a/drivers/ieee1394/nodemgr.c
> +++ b/drivers/ieee1394/nodemgr.c
> @@ -826,13 +826,11 @@ static struct node_entry *nodemgr_create_node(octlet_t guid,
>  	memcpy(&ne->device, &nodemgr_dev_template_ne,
>  	       sizeof(ne->device));
>  	ne->device.parent = &host->device;
> -	snprintf(ne->device.bus_id, BUS_ID_SIZE, "%016Lx",
> -		 (unsigned long long)(ne->guid));
> +	dev_set_name(&ne->device, "%016Lx", (unsigned long long)(ne->guid));
>  
>  	ne->node_dev.parent = &ne->device;
>  	ne->node_dev.class = &nodemgr_ne_class;
> -	snprintf(ne->node_dev.bus_id, BUS_ID_SIZE, "%016Lx",
> -		(unsigned long long)(ne->guid));
> +	dev_set_name(&ne->node_dev, "%016Lx", (unsigned long long)(ne->guid));
>  
>  	if (device_register(&ne->device))
>  		goto fail_devreg;
> @@ -932,13 +930,11 @@ static void nodemgr_register_device(struct node_entry *ne,
>  
>  	ud->device.parent = parent;
>  
> -	snprintf(ud->device.bus_id, BUS_ID_SIZE, "%s-%u",
> -		 ne->device.bus_id, ud->id);
> +	dev_set_name(&ud->device, "%s-%u", dev_name(&ne->device), ud->id);
>  
>  	ud->unit_dev.parent = &ud->device;
>  	ud->unit_dev.class = &nodemgr_ud_class;
> -	snprintf(ud->unit_dev.bus_id, BUS_ID_SIZE, "%s-%u",
> -		 ne->device.bus_id, ud->id);
> +	dev_set_name(&ud->unit_dev, "%s-%u", dev_name(&ne->device), ud->id);
>  
>  	if (device_register(&ud->device))
>  		goto fail_devreg;
> @@ -953,7 +949,7 @@ static void nodemgr_register_device(struct node_entry *ne,
>  fail_classdevreg:
>  	device_unregister(&ud->device);
>  fail_devreg:
> -	HPSB_ERR("Failed to create unit %s", ud->device.bus_id);
> +	HPSB_ERR("Failed to create unit %s", dev_name(&ud->device));
>  }	
>  
>  
> 


-- 
Stefan Richter
-=====-==--- =-=- =====
http://arcgraph.de/sr/
--
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