From 788f0923d3cb5256b12113c041c2381e4b3cecf6 Mon Sep 17 00:00:00 2001
From: Chan-yeol Park <chanyeol.park@samsung.com>
Date: Tue, 2 Apr 2013 21:24:22 +0900
Subject: [PATCH] Bluetooth: Fix possible NULL dereference in
 hci_uart_tty_receive

This patch adds a NULL check for the HCI UART ldisc driver because some
of HCI UART drivers allow hci_uart_tty_receive function to be called
even though the HCI device hasn't been registered yet.

Signed-off-by: Chan-yeol Park <chanyeol.park@samsung.com>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
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