linux-kernel - RE: [PATCH] usb: gadget: udc: atmel: used managed kasprintf

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Date:   Fri, 2 Dec 2016 15:59:57 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Alexandre Belloni' <alexandre.belloni@...e-electrons.com>,
        Felipe Balbi <balbi@...nel.org>
CC:     Nicolas Ferre <nicolas.ferre@...el.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: RE: [PATCH] usb: gadget: udc: atmel: used managed kasprintf

From: Alexandre Belloni
> Sent: 01 December 2016 10:27
> Use devm_kasprintf instead of simple kasprintf to free the allocated memory
> when needed.

s/when needed/when the device is freed/

> Suggested-by: Peter Rosin <peda@...ntia.se>
> Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
> ---
>  drivers/usb/gadget/udc/atmel_usba_udc.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/gadget/udc/atmel_usba_udc.c b/drivers/usb/gadget/udc/atmel_usba_udc.c
> index 45bc997d0711..aec72fe8273c 100644
> --- a/drivers/usb/gadget/udc/atmel_usba_udc.c
> +++ b/drivers/usb/gadget/udc/atmel_usba_udc.c
> @@ -1978,7 +1978,8 @@ static struct usba_ep * atmel_udc_of_init(struct platform_device *pdev,
>  			dev_err(&pdev->dev, "of_probe: name error(%d)\n", ret);
>  			goto err;
>  		}
> -		ep->ep.name = kasprintf(GFP_KERNEL, "ep%d", ep->index);
> +		ep->ep.name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "ep%d",
> +					     ep->index);

Acually why bother mallocing such a small string at all.
The maximum length is 12 bytes even if 'index' are unrestricted.
 
	David