linux-kernel - Re: [PATCH 2/4] staging: dgap: implement proper error handling in dgap_firmware

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Date:	Mon, 26 May 2014 13:50:31 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Daeseok Youn <daeseok.youn@...il.com>
Cc:	lidza.louina@...il.com, gregkh@...uxfoundation.org,
	devel@...verdev.osuosl.org, driverdev-devel@...uxdriverproject.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] staging: dgap: implement proper error handling in
 dgap_firmware_load()

On Mon, May 26, 2014 at 07:23:47PM +0900, Daeseok Youn wrote:
> When dgap_tty_init() and dgap_tty_register_ports() are failed,
> these are needed to free some memory properly.
> 
> It can be handled by calling dgap_tty_uninit() and dgap_cleanup_board().
> But tty's ports are not registered yet when these function are failed,
> so brd->nasync set to zero.
> 
> Signed-off-by: Daeseok Youn <daeseok.youn@...il.com>
> ---
>  drivers/staging/dgap/dgap.c |   21 ++++++++++++++++-----
>  1 files changed, 16 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/staging/dgap/dgap.c b/drivers/staging/dgap/dgap.c
> index 60b7d70..db24f70 100644
> --- a/drivers/staging/dgap/dgap.c
> +++ b/drivers/staging/dgap/dgap.c
> @@ -954,19 +954,30 @@ static int dgap_firmware_load(struct pci_dev *pdev, int card_type)
>  	 * Do tty device initialization.
>  	 */
>  	ret = dgap_tty_init(brd);
> -	if (ret < 0) {
> -		dgap_tty_uninit(brd);
> -		return ret;
> -	}
> +	if (ret < 0)
> +		goto err_cleanup;
>  
>  	ret = dgap_tty_register_ports(brd);
>  	if (ret)
> -		return ret;
> +		goto err_cleanup;
>  
>  	brd->state = BOARD_READY;
>  	brd->dpastatus = BD_RUNNING;
>  
>  	return 0;
> +
> +err_cleanup:
> +	/*
> +	 * Clear nasync to zero for avoiding to call
> +	 * some destroyer for tty's ports which are not
> +	 * registered yet in dgap_tty_uninit().
> +	 */
> +	brd->nasync = 0;
> +
> +	dgap_tty_uninit(brd);
> +	dgap_cleanup_board(brd);
> +	return ret;

Wow.  This is nasty.  We shouldn't have to call dgap_tty_uninit() when
the init failed.  Can't we clean this up instead of adding
"brd->nasync = 0;" work arounds?

regards,
dan carpenter

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