linux-kernel - Re: [PATCHv2 1/4] leds: driver for National Semiconductor LP5521 chip

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Message-Id: <20101005150256.7769a8c7.akpm@linux-foundation.org>
Date:	Tue, 5 Oct 2010 15:02:56 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Samu Onkalo <samu.p.onkalo@...ia.com>
Cc:	rpurdie@...ux.intel.com, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2 1/4] leds: driver for National Semiconductor LP5521
 chip

On Wed, 29 Sep 2010 12:10:02 +0300
Samu Onkalo <samu.p.onkalo@...ia.com> wrote:

> +#define cdev_to_led(c)		container_of(c, struct lp5521_led, cdev)
> +#define engine_to_lp5521(eng)	container_of((eng), struct lp5521_chip, \
> +						engines[(eng)->id - 1])
> +#define led_to_lp5521(led)	container_of((led), struct lp5521_chip, \
> +						leds[(led)->id])

It would be better if these were implemented as C functions.  That would
make them cqearer, cleaner and more type-safe (container_of uses
typecasts in a way which makes it possible to misuse).

Also that would fix the bug which cdev_to_led(foo++) adds.

Similar improvements can be made to the other driver.  Also
SHIFT_MASK() and LE_ACTIVE() could become regular old lower-case C
functions, I think.

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