linux-kernel - Re: [PATCH] staging: dgap: implement error handling in dgap_tty

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Message-ID: <20140425092607.GH26890@mwanda>
Date:	Fri, 25 Apr 2014 12:26:07 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Daeseok Youn <daeseok.youn@...il.com>,
	Mark Hounschell <markh@...pro.net>
Cc:	lidza.louina@...il.com, gregkh@...uxfoundation.org,
	devel@...verdev.osuosl.org, driverdev-devel@...uxdriverproject.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: dgap: implement error handling in
 dgap_tty_register()

Mark, maybe you should add yourself to the MAINTAINERS entry for this
driver?

On Fri, Apr 25, 2014 at 04:04:59PM +0900, Daeseok Youn wrote:
> @@ -1263,7 +1277,8 @@ static int dgap_tty_register(struct board_t *brd)
>  		/* Register tty devices */
>  		rc = tty_register_driver(brd->SerialDriver);
>  		if (rc < 0)
> -			return rc;
> +			goto free_print_ttys;
> +
>  		brd->dgap_Major_Serial_Registered = TRUE;
>  		dgap_BoardsByMajor[brd->SerialDriver->major] = brd;
>  		brd->dgap_Serial_Major = brd->SerialDriver->major;
> @@ -1273,13 +1288,29 @@ static int dgap_tty_register(struct board_t *brd)
>  		/* Register Transparent Print devices */
>  		rc = tty_register_driver(brd->PrintDriver);
>  		if (rc < 0)
> -			return rc;
> +			goto unregister_serial_drv;
> +
>  		brd->dgap_Major_TransparentPrint_Registered = TRUE;
>  		dgap_BoardsByMajor[brd->PrintDriver->major] = brd;
>  		brd->dgap_TransparentPrint_Major = brd->PrintDriver->major;
>  	}
>  
>  	return rc;
> +
> +unregister_serial_drv:
> +	tty_unregister_driver(brd->SerialDriver);

We only register the ->SerialDriver if someone else hasn't registered it
first?  So this should be:

	if (we_were_the_ones_who_registered_the_serial_driver)
		tty_unregister_driver(brd->SerialDriver);

I haven't followed looked at this.  Who else is registering the serial
driver?  You have looked at this, what do you think?  Or Mark.

regards,
dan carpenter

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