linux-kernel - Re: [PATCH v4 1/3] usb: ohci-at91: replace request_mem_region + ioremap by devm_ioremap

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Message-ID: <52A4BAF6.501@cogentembedded.com>
Date:	Sun, 08 Dec 2013 21:31:18 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Boris BREZILLON <b.brezillon@...rkiz.com>,
	Douglas Gilbert <dgilbert@...erlog.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	Grant Likely <grant.likely@...aro.org>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 1/3] usb: ohci-at91: replace request_mem_region + ioremap
 by devm_ioremap_resource

Hello.

On 12/08/2013 06:02 PM, Boris BREZILLON wrote:

> Replace the request_mem_region + ioremap calls by the
> devm_ioremap_resource call which does the same things but with device
> managed resources.

> Signed-off-by: Boris BREZILLON <b.brezillon@...rkiz.com>
> Acked-by: Nicolas Ferre <nicolas.ferre@...el.com>
> Signed-off-by: Alan Stern <stern@...land.harvard.edu>
> ---
>   drivers/usb/host/ohci-at91.c |   28 +++++++---------------------
>   1 file changed, 7 insertions(+), 21 deletions(-)

> diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c
> index 8c356af..fe2ecc5 100644
> --- a/drivers/usb/host/ohci-at91.c
> +++ b/drivers/usb/host/ohci-at91.c
> @@ -158,24 +158,18 @@ static int usb_hcd_at91_probe(const struct hc_driver *driver,
>   	hcd->rsrc_start = res->start;
>   	hcd->rsrc_len = resource_size(res);
>
> -	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
> -		pr_debug("request_mem_region failed\n");
> -		retval = -EBUSY;
> -		goto err1;
> -	}
> -
> -	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
> -	if (!hcd->regs) {
> -		pr_debug("ioremap failed\n");
> -		retval = -EIO;
> -		goto err2;
> +	hcd->regs = devm_ioremap_resource(dev, res);
> +	if (IS_ERR(hcd->regs)) {
> +		dev_dbg(dev, "devm_ioremap_resource failed\n");

    I've already told you devm_ioremap_resource() prints the detailed error 
message. No need to duplicate it.

> +		retval = PTR_ERR(hcd->regs);
> +		goto err;
>   	}

WBR, Sergei

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