linux-kernel - [PATCH 1/2] serial_core: Get a reference for port->tty in uart_remove_one

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Date:	Mon, 17 Mar 2014 14:10:58 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	Peter Hurley <peter@...leysoftware.com>
Cc:	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert+renesas@...ux-m68k.org>
Subject: [PATCH 1/2] serial_core: Get a reference for port->tty in uart_remove_one_port()

From: Geert Uytterhoeven <geert+renesas@...ux-m68k.org>

Suggested-by: Peter Hurley <peter@...leysoftware.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@...ux-m68k.org>
---
 drivers/tty/serial/serial_core.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 8ee90f731f31..21084f0b8ea4 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -2647,6 +2647,7 @@ int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport)
 {
 	struct uart_state *state = drv->state + uport->line;
 	struct tty_port *port = &state->port;
+	struct tty_struct *tty;
 	int ret = 0;
 
 	BUG_ON(in_interrupt());
@@ -2675,8 +2676,11 @@ int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport)
 	 */
 	tty_unregister_device(drv->tty_driver, uport->line);
 
-	if (port->tty)
+	tty = tty_port_tty_get(port);
+	if (tty) {
 		tty_vhangup(port->tty);
+		tty_kref_put(tty);
+	}
 
 	/*
 	 * If the port is used as a console, unregister it, and power it down
-- 
1.7.9.5

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