linux-kernel - Re: [PATCH can-next v3 1/2] can: add tx/rx LED trigger support

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Date:	Tue, 31 Jul 2012 14:00:36 +0200
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Fabio Baltieri <fabio.baltieri@...il.com>
CC:	linux-can@...r.kernel.org, linux-kernel@...r.kernel.org,
	Oliver Hartkopp <socketcan@...tkopp.net>,
	Wolfgang Grandegger <wg@...ndegger.com>
Subject: Re: [PATCH can-next v3 1/2] can: add tx/rx LED trigger support

On 07/31/2012 01:57 PM, Fabio Baltieri wrote:
[...]

>>>> Can you provide a devm implementation for can_led?
>>>
>>> Sounds reasonable, you mean like a devm_kasprintf implementation to
>>> remove kfree and unwinding code?
>>
>> IMHO it would be sufficient if you implement the devm cleanup functions
>> here.
> 
> Uh - can you be more specific?  I mean, are you suggesting to just
> convert the code to something like:
> 
> unsigned int len;
> char *p;
> 
> len = snprintf(NULL, 0, "%s-tx", netdev->name);
> p = devm_kzalloc(&netdev->dev, len + 1, GFP_KERNEL);
> if (!p)
> return -ENOMEM;
> sprintf(p, len + 1, "%s-tx", netdev->name);

This would work, if you just have to free both names, but...

> or to implement something with devres_alloc() and a specific
> release function?

...you have to call led_trigger_unregister_simple(), so we need a custom
release function.

Marc

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