linux-kernel - Re: [PATCH] leds-fsg: Change order of initialization and deinitialization

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Message-Id: <20080730005853.3f343d93.akpm@linux-foundation.org>
Date:	Wed, 30 Jul 2008 00:58:53 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Sven Wegener <sven.wegener@...aler.net>
Cc:	Richard Purdie <rpurdie@...ys.net>, Rod Whitby <rod@...tby.id.au>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] leds-fsg: Change order of initialization and
 deinitialization

On Sun, 27 Jul 2008 20:30:59 +0200 (CEST) Sven Wegener <sven.wegener@...aler.net> wrote:

> --- a/drivers/leds/leds-fsg.c
> +++ b/drivers/leds/leds-fsg.c
> @@ -161,6 +161,16 @@ static int fsg_led_probe(struct platform_device *pdev)
>  {
>  	int ret;
>  
> +	/* Map the LED chip select address space */
> +	latch_address = (unsigned short *) ioremap(IXP4XX_EXP_BUS_BASE(2), 512);
> +	if (!latch_address) {
> +		ret = -ENOMEM;
> +		goto failremap;
> +	}
> +
> +	latch_value = 0xffff;
> +	*latch_address = latch_value;

Mutter.  Shouldn't this driver be using readw/writew?  It's not even
using a volatile pointer, so there's a decent risk that the compiler
will optimise away important things..

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