linux-kernel - Re: [PATCH 2/2] usb: gadget: f_midi: check for error on usb_ep

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Message-ID: <20150921063026.GB15180@shlinux2>
Date:	Mon, 21 Sep 2015 14:30:27 +0800
From:	Peter Chen <peter.chen@...escale.com>
To:	<eu@...ipetonello.com>
CC:	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	Felipe Balbi <balbi@...com>,
	Andrzej Pietrasiewicz <andrzej.p@...sung.com>
Subject: Re: [PATCH 2/2] usb: gadget: f_midi: check for error on usb_ep_queue

On Fri, Sep 18, 2015 at 06:12:41PM +0100, eu@...ipetonello.com wrote:
> From: "Felipe F. Tonello" <eu@...ipetonello.com>
> 
> f_midi is not checking weather the is an error on usb_ep_queue

%s/weather/whether
%s/the/there

> request, ignoring potential problems, such as memory leaks.
> 
> Signed-off-by: Felipe F. Tonello <eu@...ipetonello.com>
> ---
>  drivers/usb/gadget/function/f_midi.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/gadget/function/f_midi.c b/drivers/usb/gadget/function/f_midi.c
> index ad50a67..a5e446d 100644
> --- a/drivers/usb/gadget/function/f_midi.c
> +++ b/drivers/usb/gadget/function/f_midi.c
> @@ -543,8 +543,14 @@ static void f_midi_transmit(struct f_midi *midi, struct usb_request *req)
>  		}
>  	}
>  
> -	if (req->length > 0)
> -		usb_ep_queue(ep, req, GFP_ATOMIC);
> +	if (req->length > 0) {
> +		int err;
> +
> +		err = usb_ep_queue(ep, req, GFP_ATOMIC);
> +		if (err < 0)
> +			ERROR(midi, "%s queue req: %d\n",
> +			      midi->out_ep->name, err);
> +	}
>  	else
>  		free_ep_req(ep, req);
>  }
> -- 
> 2.1.4
> 

-- 

Best Regards,
Peter Chen
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