linux-kernel - Re: [PATCH 08/21] TTY: hci_ldisc, remove invalid check in open

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Date:	Thu, 18 Oct 2012 13:47:19 -0700
From:	Marcel Holtmann <marcel@...tmann.org>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	gregkh@...uxfoundation.org, alan@...ux.intel.com,
	linux-kernel@...r.kernel.org, jirislaby@...il.com,
	Gustavo Padovan <gustavo@...ovan.org>,
	Johan Hedberg <johan.hedberg@...il.com>,
	linux-bluetooth@...r.kernel.org
Subject: Re: [PATCH 08/21] TTY: hci_ldisc, remove invalid check in open

Hi Jiri,

> hci_ldisc's open checks if tty_struct->disc_data is set. And if so it
> returns with an error. But nothing ensures disc_data to be NULL. And
> since ld->ops->open shall be called only once, we do not need the
> check at all. So remove it.
> 
> Note that this is not an issue now, but n_tty will start using the
> disc_data pointer and this invalid 'if' would trigger then rendering
> TTYs over BT unusable.
> 
> Signed-off-by: Jiri Slaby <jslaby@...e.cz>
> Cc: Marcel Holtmann <marcel@...tmann.org>
> Cc: Gustavo Padovan <gustavo@...ovan.org>
> Cc: Johan Hedberg <johan.hedberg@...il.com>
> Cc: linux-bluetooth@...r.kernel.org
> ---
>  drivers/bluetooth/hci_ldisc.c | 7 +------
>  1 file changed, 1 insertion(+), 6 deletions(-)

Acked-by: Marcel Holtmann <marcel@...tmann.org>

Regards

Marcel


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