linux-kernel - Re: [PATCH v2 2/4] input: keyboard: tegra: use devm

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Date:	Sun, 6 Jan 2013 20:27:39 +0100
From:	Thierry Reding <thierry.reding@...onic-design.de>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Laxman Dewangan <ldewangan@...dia.com>, grant.likely@...retlab.ca,
	rob.herring@...xeda.com, swarren@...dia.com,
	devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
	linux-tegra@...r.kernel.org
Subject: Re: [PATCH v2 2/4] input: keyboard: tegra: use devm_* for resource
 allocation

On Sat, Jan 05, 2013 at 12:06:58AM -0800, Dmitry Torokhov wrote:
> On Sat, Jan 05, 2013 at 01:15:08PM +0530, Laxman Dewangan wrote:
[...]
> > @@ -735,25 +738,16 @@ static int tegra_kbc_probe(struct platform_device *pdev)
> >  	spin_lock_init(&kbc->lock);
> >  	setup_timer(&kbc->timer, tegra_kbc_keypress_timer, (unsigned long)kbc);
> >  
> > -	res = request_mem_region(res->start, resource_size(res), pdev->name);
> > -	if (!res) {
> > -		dev_err(&pdev->dev, "failed to request I/O memory\n");
> > -		err = -EBUSY;
> > -		goto err_free_mem;
> > -	}
> > -
> > -	kbc->mmio = ioremap(res->start, resource_size(res));
> > +	kbc->mmio = devm_request_and_ioremap(&pdev->dev, res);
> >  	if (!kbc->mmio) {
> > -		dev_err(&pdev->dev, "failed to remap I/O memory\n");
> > -		err = -ENXIO;
> > -		goto err_free_mem_region;
> > +		dev_err(&pdev->dev, "Cannot request memregion/iomap address\n");
> > +		return -EADDRNOTAVAIL;
> 
> Erm, no, -EBUSY please.

EADDRNOTAVAIL is the canonical error for devm_request_and_ioremap()
failure. The kerneldoc comment in lib/devres.c even gives a short
example that uses this error code.

Thierry

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