linux-kernel - Re: [PATCH] USB: emi26: Delete an error message for a failed memory allocation in emi26

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Message-ID: <alpine.DEB.2.20.1712061312090.9552@hadrien>
Date:   Wed, 6 Dec 2017 13:12:32 +0100 (CET)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>
cc:     linux-usb@...r.kernel.org,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Johan Hovold <johan@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] USB: emi26: Delete an error message for a failed memory
 allocation in emi26_writememory()



On Wed, 6 Dec 2017, SF Markus Elfring wrote:

> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Wed, 6 Dec 2017 13:03:21 +0100
>
> Omit an extra message for a memory allocation failure in this function.
>
> This issue was detected by using the Coccinelle software.
>
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
>  drivers/usb/misc/emi26.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/usb/misc/emi26.c b/drivers/usb/misc/emi26.c
> index 24d841850e05..654e93857d65 100644
> --- a/drivers/usb/misc/emi26.c
> +++ b/drivers/usb/misc/emi26.c
> @@ -42,10 +42,9 @@ static int emi26_writememory (struct usb_device *dev, int address,
>  	int result;
>  	unsigned char *buffer =  kmemdup(data, length, GFP_KERNEL);
>
> -	if (!buffer) {
> -		dev_err(&dev->dev, "kmalloc(%d) failed.\n", length);

I guess the length information would not be so easy to find in the
backtrace.

julia


> +	if (!buffer)
>  		return -ENOMEM;
> -	}
> +
>  	/* Note: usb_control_msg returns negative value on error or length of the
>  	 * 		 data that was written! */
>  	result = usb_control_msg (dev, usb_sndctrlpipe(dev, 0), request, 0x40, address, 0, buffer, length, 300);
> --
> 2.15.1
>
> --
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