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[SERIAL] initialize spinlock for port failed to setup console

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It seems serial_core intend to initialize port->lock just once for each
ports.  This is done in uart_set_options() for console, and in
uart_add_one_port() for other ports.  But there is a case the port->lock is
not initialized by serial_core.  If the setup function for the console was
failed, it will not call uart_set_options() but the port is marked as
console (uart_console(port) returns 1).  It can happen if console was PCI
port which can not detected at the time of register_console.

This patch is to initialize port->lock for such console port.  With this
change, most of spin_lock_init() (some of them are labeled "Temporary
fix.") in low-level serial drivers can be omitted.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Atsushi Nemoto 2006-02-02 20:53:39 +00:00 committed by Russell King
parent 3ec9c59449
commit 9c0f4755bd
1 changed files with 1 additions and 1 deletions
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2
drivers/serial/serial_core.c
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@ -2237,7 +2237,7 @@ int uart_add_one_port(struct uart_driver *drv, struct uart_port *port)
* If this port is a console, then the spinlock is already
* initialised.
*/
if (!uart_console(port))
if (!(uart_console(port) && (port->cons->flags & CON_ENABLED)))
spin_lock_init(&port->lock);
uart_configure_port(drv, state, port);