linux-kernel - Re: [PATCH] Platform: Samsung Q10 backlight driver

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Date:	Wed, 16 Feb 2011 17:05:12 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Greg KH <gregkh@...e.de>
Cc:	Frederick van der Wyck <fvanderwyck@...il.com>, mjg@...hat.com,
	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Platform: Samsung Q10 backlight driver

On Wed, Feb 16, 2011 at 03:58:07PM -0800, Greg KH wrote:
> On Wed, Feb 16, 2011 at 11:30:29PM +0000, Frederick van der Wyck wrote:
> > +
> > +static void samsungq10_bl_send_intensity(struct backlight_device *bd)
> > +{
> > +	int brightness = bd->props.brightness;
> > +
> > +	if (!samsungq10_suspended) {
> > +		while (inb(0x64)&2)
> > +			;
> > +		outb_p(0xbe, 0x64);
> > +		while (inb(0x64)&2)
> > +			;
> > +		outb_p(0x89, 0x60);
> > +		while (inb(0x64)&2)
> > +			;
> > +		outb_p(0x91, 0x60);
> > +		while (inb(0x64)&2)
> > +			;
> 
> Potentially endless loops are not good, please timeout if you don't get
> the proper value over a time.

Double not good since it is i8042 registers. Use
i8042_lock_chip()/i8042_command()/i8042_unlock_chip().

-- 
Dmitry
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