linux-kernel - Re: [PATCH/HP7XX] - Add combined LCD / BL driver for platform HP Jornada 7xx handhelds

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Message-Id: <20080206204905.315fde57.Kristoffer.ericson@gmail.com>
Date:	Wed, 6 Feb 2008 20:49:05 +0100
From:	Kristoffer Ericson <kristoffer.ericson@...il.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Kristoffer Ericson <kristoffer.ericson@...il.com>,
	Roel Kluin <12o3l@...cali.nl>, rpurdie@...nedhand.com,
	Linux-arm <linux-arm-kernel@...ts.arm.linux.org.uk>,
	linux-main <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH/HP7XX] - Add combined LCD / BL driver for platform HP
 Jornada 7xx handhelds

I made a mistake on the latest patch I sent, 

if (IS_ERR(bllcd->lcd_device)) {
+		ret = PTR_ERR(bllcd->bl_device);
+		backlight_device_unregister(bllcd->bl_device);
+		printk(KERN_ERR "lcd :failed to register device\n");
+		kfree(bllcd);
+		return ret;
+	}

should ofcourse read

if (IS_ERR(bllcd->lcd_device)) {
+		ret = PTR_ERR(bllcd->lcd_device);
+		backlight_device_unregister(bllcd->bl_device);
+		printk(KERN_ERR "lcd :failed to register device\n");
+		kfree(bllcd);
+		return ret;
+	}

Its fixed now for me. Going to test that mdelay issue now.


On Wed, 6 Feb 2008 19:31:55 +0000
Russell King - ARM Linux <linux@....linux.org.uk> wrote:

> On Wed, Feb 06, 2008 at 08:21:28PM +0100, Kristoffer Ericson wrote:
> > Oh, and thanks for all the feedback people! (and for doing it nicely)
> 
> I'm afraid you missed one - and there's a better fix for one of the other
> points I made... 8)
> 
> > +static int jornada_bl_probe(struct platform_device *pdev)
> > +{
> > +	struct bllcd_device *bllcd;
> 
> 	int ret;
> 
> > +
> > +	bllcd = kzalloc(sizeof(*bllcd), GFP_KERNEL);
> > +	if (bllcd == NULL)
> > +		return -ENOMEM;
> > +
> > +	/* bl driver - name must match fb driver name */
> > +	bllcd->bl_device = backlight_device_register(S1D_DEVICENAME,
> > +	&pdev->dev, NULL, &jornada_bl_ops);
> > +
> > +	if (IS_ERR(bllcd->bl_device)) {
> 
> 		ret = PTR_ERR(bllcd->bl_device);
> 
> > +		kfree(bllcd);
> > +		printk(KERN_ERR "bl :failed to register device\n");
> > +		return -ENODEV;
> 
> delete the line above, and then swap the two remaining lines.
> 
> 		return ret;
> 
> > +	}
> > +
> > +	/* lcd driver */
> > +	bllcd->lcd_device = lcd_device_register(S1D_DEVICENAME,
> > +				&pdev->dev, NULL, &jornada_lcd_ops);
> > +	if (IS_ERR(bllcd->lcd_device)) {
> > +		backlight_device_unregister(bllcd->bl_device);
> 
> 		ret = PTR_ERR(bllcd->lcd_device);
> 
> > +		kfree(bllcd);
> > +		printk(KERN_ERR "lcd :failed to register device\n");
> > +		return -ENODEV;
> 
> delete the line above, and then swap the two remaining lines.
> 
> 		return ret;
> 
> The reason for swapping the two lines is that it _might_ give gcc a
> chance to optimise the two paths.
> 
> > +static struct platform_driver jornada_bl_driver = {
> > +	.probe	= jornada_bl_probe,
> > +	.remove	= jornada_bl_remove,
> > +#ifdef CONFIG_PM
> > +	.suspend = jornada_bl_suspend,
> > +	.resume = jornada_bl_resume,
> > +#endif
> > +	.driver = {
> > +	    .name = "jornada_bllcd",
> 
> You missed this one - which currently is: tab space space space space.
> It should be two tabs.
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