serial: fix enable_irq_wake/disable_irq_wake imbalance in serial_core.c
authorArjan van de Ven <arjan@linux.intel.com>
Fri, 23 May 2008 20:04:49 +0000 (13:04 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Sat, 24 May 2008 16:56:11 +0000 (09:56 -0700)
enable_irq_wake() and disable_irq_wake() need to be balanced.  However,
serial_core.c calls these for different conditions during the suspend and
resume functions...

This is causing a regular WARN_ON() as found at
http://www.kerneloops.org/search.php?search=set_irq_wake

This patch makes the conditions for triggering the _wake enable/disable
sequence identical.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
drivers/serial/serial_core.c

index eab032733790d5524ac9f14e8596c1a5a62e462c..53b03c629afffc86812e4fc22ba973d0c757cc5a 100644 (file)
@@ -2054,6 +2054,8 @@ int uart_suspend_port(struct uart_driver *drv, struct uart_port *port)
 int uart_resume_port(struct uart_driver *drv, struct uart_port *port)
 {
        struct uart_state *state = drv->state + port->line;
+       struct device *tty_dev;
+       struct uart_match match = {port, drv};
 
        mutex_lock(&state->mutex);
 
@@ -2063,7 +2065,8 @@ int uart_resume_port(struct uart_driver *drv, struct uart_port *port)
                return 0;
        }
 
-       if (!port->suspended) {
+       tty_dev = device_find_child(port->dev, &match, serial_match_port);
+       if (!port->suspended && device_may_wakeup(tty_dev)) {
                disable_irq_wake(port->irq);
                mutex_unlock(&state->mutex);
                return 0;