linux-kernel - [PATCH] serial: do not call ->pm() on initialization for console port

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Message-Id: <20071019.011355.39154656.anemo@mba.ocn.ne.jp>
Date:	Fri, 19 Oct 2007 01:13:55 +0900 (JST)
From:	Atsushi Nemoto <anemo@....ocn.ne.jp>
To:	rmk+kernel@....linux.org.uk
Cc:	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: [PATCH] serial: do not call ->pm() on initialization for console
 port

This commit in current git tree broke serial console for serial_txx9 driver.

> commit 97d97224ff361e08777fb33e0fd193ca877dac28
> Author: Russell King <rmk@...-67.arm.linux.org.uk>
> Date:   Sat Sep 1 21:25:09 2007 +0100
> 
>     [SERIAL] Fix console initialisation ordering

The serial_txx9 driver initialize its port entirely on its ->pm()
method if new state was 0.  With the commit, serial_core calls ->pm()
even if the port was used for console.

Attached patch fixes this problem.  Is this a right way?
If not, I will fix the serial_txx9 driver to skip the initialization in
->pm() if oldstate was -1.


------------------------------------------------------
Subject: serial: do not call ->pm() on initialization for console port
From: Atsushi Nemoto <anemo@....ocn.ne.jp>

If the port was already enabled as a serial console, there is no need
to call pm callback to power it up.  This patch fixes serial console
initialization on serial_txx9 driver.

Signed-off-by: Atsushi Nemoto <anemo@....ocn.ne.jp>
---
diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
index 68aa4da..5a38076 100644
--- a/drivers/serial/serial_core.c
+++ b/drivers/serial/serial_core.c
@@ -2326,7 +2326,6 @@ int uart_add_one_port(struct uart_driver *drv, struct uart_port *port)
 	}
 
 	state->port = port;
-	state->pm_state = -1;
 
 	port->cons = drv->cons;
 	port->info = state->info;
@@ -2336,6 +2335,7 @@ int uart_add_one_port(struct uart_driver *drv, struct uart_port *port)
 	 * initialised.
 	 */
 	if (!(uart_console(port) && (port->cons->flags & CON_ENABLED))) {
+		state->pm_state = -1;
 		spin_lock_init(&port->lock);
 		lockdep_set_class(&port->lock, &port_lock_key);
 	}
-
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