linux-kernel - Re: [PATCH] usb: gadget: f_fs: remove redundant ffs_data

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Message-ID: <xa1ttx3dedd4.fsf@mina86.com>
Date:	Thu, 09 Oct 2014 12:39:19 +0200
From:	Michal Nazarewicz <mina86@...a86.com>
To:	Robert Baldyga <r.baldyga@...sung.com>, balbi@...com
Cc:	gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, andrzej.p@...sung.com,
	m.szyprowski@...sung.com, Robert Baldyga <r.baldyga@...sung.com>
Subject: Re: [PATCH] usb: gadget: f_fs: remove redundant ffs_data_get()

On Thu, Oct 09 2014, Robert Baldyga <r.baldyga@...sung.com> wrote:
> During FunctionFS bind, ffs_data_get() function was called twice
> (in functionfs_bind() and in ffs_do_functionfs_bind()), while on unbind
> ffs_data_put() was called once (in functionfs_unbind() function).
> In result refcount never reached value 0, and ffs memory resources has
> been never released.
>
> Since ffs_data_get() call in ffs_do_functionfs_bind() is redundant
> and not neccessary, we remove it to have equal number of gets ans puts,
> and free allocated memory after refcount reach 0.
>
> Signed-off-by: Robert Baldyga <r.baldyga@...sung.com>

Acked-by: Michal Nazarewicz <mina86@...a86.com>

> ---
>  drivers/usb/gadget/function/f_fs.c | 2 --
>  1 file changed, 2 deletions(-)
>
> diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
> index 7c6771d..12dbdaf 100644
> --- a/drivers/usb/gadget/function/f_fs.c
> +++ b/drivers/usb/gadget/function/f_fs.c
> @@ -2663,8 +2663,6 @@ static inline struct f_fs_opts *ffs_do_functionfs_bind(struct usb_function *f,
>  	func->conf = c;
>  	func->gadget = c->cdev->gadget;
>  
> -	ffs_data_get(func->ffs);
> -
>  	/*
>  	 * in drivers/usb/gadget/configfs.c:configfs_composite_bind()
>  	 * configurations are bound in sequence with list_for_each_entry,
> -- 
> 1.9.1
>

-- 
Best regards,                                         _     _
.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  Michał “mina86” Nazarewicz    (o o)
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