linux-kernel - Re: [PATCH v2 09/31] USB: ehci-omap: Use devm_ioremap

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Date:	Mon, 4 Feb 2013 16:11:29 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Roger Quadros <rogerq@...com>
cc:	tony@...mide.com, <linux@....linux.org.uk>,
	<sameo@...ux.intel.com>, <balbi@...com>,
	<gregkh@...uxfoundation.org>, <eballetbo@...il.com>,
	<javier@...hile0.org>, <sshtylyov@...sta.com>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 09/31] USB: ehci-omap: Use devm_ioremap_resource()

On Mon, 4 Feb 2013, Roger Quadros wrote:

> Make use of devm_ioremap_resource() and correct comment.
> 
> CC: Alan Stern <stern@...land.harvard.edu>
> Signed-off-by: Roger Quadros <rogerq@...com>
> ---
>  drivers/usb/host/ehci-omap.c |   21 ++++++---------------
>  1 files changed, 6 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/usb/host/ehci-omap.c b/drivers/usb/host/ehci-omap.c
> index 30fc482..6b088a4 100644
> --- a/drivers/usb/host/ehci-omap.c
> +++ b/drivers/usb/host/ehci-omap.c
> @@ -216,23 +216,17 @@ static int ehci_hcd_omap_probe(struct platform_device *pdev)
>  
>  	res =  platform_get_resource_byname(pdev,
>  				IORESOURCE_MEM, "ehci");
> -	if (!res) {
> -		dev_err(dev, "UHH EHCI get resource failed\n");
> -		return -ENODEV;
> -	}
> -
> -	regs = ioremap(res->start, resource_size(res));
> -	if (!regs) {
> -		dev_err(dev, "UHH EHCI ioremap failed\n");
> -		return -ENOMEM;
> +	regs = devm_ioremap_resource(dev, res);
> +	if (IS_ERR(regs)) {
> +		dev_err(dev, "Resource request/ioremap failed\n");

According to Thierry Reding, devm_ioremap_resource() provides its own 
error messages.  Hence this one isn't needed.

Apart from this one issue,

Acked-by: Alan Stern <stern@...land.harvard.edu>

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