linux-kernel - Re: [PATCH 1/5] usb: gadget: ffs: call functionfs_unbind() if _ffs_func

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Date:	Tue, 7 Jul 2015 17:53:45 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Robert Baldyga <r.baldyga@...sung.com>
Cc:	gregkh@...uxfoundation.org, balbi@...com,
	devel@...verdev.osuosl.org, hamohammed.sa@...il.com,
	chris@...vick.com, tapaswenipathak@...il.com,
	linux-usb@...r.kernel.org, nicolas.ferre@...el.com,
	hgujulan@...teon.com, mina86@...a86.com,
	linux-kernel@...r.kernel.org, vinc94@...il.com,
	roberta.dobrescu@...il.com, andrzej.p@...sung.com,
	linux-arm-kernel@...ts.infradead.org, m.szyprowski@...sung.com
Subject: Re: [PATCH 1/5] usb: gadget: ffs: call functionfs_unbind() if
 _ffs_func_bind() fails

On Tue, Jul 07, 2015 at 04:02:49PM +0200, Robert Baldyga wrote: 
> diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
> index 6e7be91..966b214 100644
> --- a/drivers/usb/gadget/function/f_fs.c
> +++ b/drivers/usb/gadget/function/f_fs.c
> @@ -2897,11 +2897,19 @@ static int ffs_func_bind(struct usb_configuration *c,
>  			 struct usb_function *f)
>  {
>  	struct f_fs_opts *ffs_opts = ffs_do_functionfs_bind(f, c);
> +	struct ffs_function *func = ffs_func_from_usb(f);
> +	int ret;
>  
>  	if (IS_ERR(ffs_opts))
>  		return PTR_ERR(ffs_opts);
>  
> -	return _ffs_func_bind(c, f);
> +	ret = _ffs_func_bind(c, f);
> +	if (ret) {
> +		ffs_opts->refcnt--;

Wait, why are we decrementing here?  ffs_func_unbind() already has a
decrement so this looks like a bug to me.  Add a comment if it's really
needed.

> +		functionfs_unbind(func->ffs);

regards,
dan carpenter


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