linux-kernel - [PATCH] Serial: BUGFIX: uart_resume

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Message-id: <1286949486-2446-1-git-send-email-myungjoo.ham@samsung.com>
Date:	Wed, 13 Oct 2010 14:58:06 +0900
From:	MyungJoo Ham <myungjoo.ham@...sung.com>
To:	linux-kernel@...r.kernel.org
Cc:	myungjoo.ham@...il.com, kyungmin.park@...sung.com,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Alan Cox <alan@...ux.intel.com>, Arnd Bergmann <arnd@...db.de>,
	Andr Goddard Rosa <andre.goddard@...il.com>,
	Stanislav Brabec <sbrabec@...e.cz>
Subject: [PATCH] Serial: BUGFIX: uart_resume_port has an omitted condition.

When console_suspend_enabled == 0, console_stop() was not called at
suspend; thus, it does not need to call console_start() when resume.
Besides, calling console_start() without calling console_stop() before
had been incurring kernel hang with console_suspend_enabled == 0 in a
machine with drivers/serial/samsung.c and s5pc210.

Signed-off-by: MyungJoo Ham <myungjoo.ham@...sung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
---
 drivers/serial/serial_core.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
index cd85112..ff21200 100644
--- a/drivers/serial/serial_core.c
+++ b/drivers/serial/serial_core.c
@@ -2065,7 +2065,7 @@ int uart_resume_port(struct uart_driver *drv, struct uart_port *uport)
 	/*
 	 * Re-enable the console device after suspending.
 	 */
-	if (uart_console(uport)) {
+	if (console_suspend_enabled && uart_console(uport)) {
 		uart_change_pm(state, 0);
 		uport->ops->set_termios(uport, &termios, NULL);
 		console_start(uport->cons);
-- 
1.6.3.3

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