linux-kernel - Re: [PATCH 03/30] usb: ohci-at91: Use devm_platform_get_and_ioremap

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Message-ID: <2ab38659-a25b-43a8-934a-5d44533a51c2@rowland.harvard.edu>
Date:   Wed, 26 Jul 2023 10:27:43 -0400
From:   Alan Stern <stern@...land.harvard.edu>
To:     Yangtao Li <frank.li@...o.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        linux-usb@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/30] usb: ohci-at91: Use
 devm_platform_get_and_ioremap_resource()

On Wed, Jul 26, 2023 at 07:37:49PM +0800, Yangtao Li wrote:
> Convert platform_get_resource(), devm_ioremap_resource() to a single
> call to devm_platform_get_and_ioremap_resource(), as this is exactly
> what this function does.
> 
> Signed-off-by: Yangtao Li <frank.li@...o.com>
> ---
>  drivers/usb/host/ohci-at91.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c
> index b9ce8d80f20b..f957d008f360 100644
> --- a/drivers/usb/host/ohci-at91.c
> +++ b/drivers/usb/host/ohci-at91.c
> @@ -200,8 +200,7 @@ static int usb_hcd_at91_probe(const struct hc_driver *driver,
>  		return -ENOMEM;
>  	ohci_at91 = hcd_to_ohci_at91_priv(hcd);
>  
> -	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	hcd->regs = devm_ioremap_resource(dev, res);
> +	hcd->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
>  	if (IS_ERR(hcd->regs)) {
>  		retval = PTR_ERR(hcd->regs);
>  		goto err;

Did you try to test-compile this change (and all the similar ones in 
this series)?  If you did, you would have gotten a warning about res 
being used without being initialized.

Alan Stern