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

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Message-ID: <Pine.LNX.4.44L0.1712061144310.1507-100000@iolanthe.rowland.org>
Date:   Wed, 6 Dec 2017 11:45:31 -0500 (EST)
From:   Alan Stern <stern@...land.harvard.edu>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>
cc:     linux-usb@...r.kernel.org, Daniel Drake <drake@...lessm.com>,
        Dmitry Fleytman <dmitry@...nix.com>,
        Eugene Korenevsky <ekorenevsky@...il.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Günter Röck <linux@...ck-us.net>,
        Johan Hovold <johan@...nel.org>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        Peter Chen <peter.chen@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH] USB: hub: Delete an error message for a failed memory
 allocation in usb_hub_clear_tt_buffer()

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

> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Wed, 6 Dec 2017 17:00:18 +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/core/hub.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
> index 7ccdd3d4db84..9fbb908e9552 100644
> --- a/drivers/usb/core/hub.c
> +++ b/drivers/usb/core/hub.c
> @@ -829,7 +829,6 @@ int usb_hub_clear_tt_buffer(struct urb *urb)
>  	 */
>  	clear = kmalloc(sizeof *clear, GFP_ATOMIC);
>  	if (clear == NULL) {
> -		dev_err(&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
>  		/* FIXME recover somehow ... RESET_TT? */
>  		return -ENOMEM;
>  	}

Does the existing memory allocation error message include the 
&udev->dev device name and driver name?  If it doesn't, there will be 
no way for the user to tell that the error message is related to the 
device failure.

Alan Stern