[PATCH] lockdep: annotate serial

Teach special (dual-initialized) locking code to the lock validator.  Has no
effect on non-lockdep kernels.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 10 insertions, 1 deletions

diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
index c54af8774393..95831808334c 100644
--- a/drivers/serial/serial_core.c
+++ b/drivers/serial/serial_core.c
@@ -49,6 +49,12 @@
  */
 static DEFINE_MUTEX(port_mutex);
 
+/*
+ * lockdep: port->lock is initialized in two places, but we
+ *          want only one lock-class:
+ */
+static struct lock_class_key port_lock_key;
+
 #define HIGH_BITS_OFFSET        ((sizeof(long)-sizeof(int))*8)
 
 #define uart_users(state)       ((state)->count + ((state)->info ? (state)->info->blocked_open : 0))
@@ -1865,6 +1871,7 @@ uart_set_options(struct uart_port *port, struct console *co,
          * early.
          */
         spin_lock_init(&port->lock);
+        lockdep_set_class(&port->lock, &port_lock_key);
 
         memset(&termios, 0, sizeof(struct termios));
 
@@ -2247,8 +2254,10 @@ 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) && (port->cons->flags & CON_ENABLED)))
+        if (!(uart_console(port) && (port->cons->flags & CON_ENABLED))) {
                 spin_lock_init(&port->lock);
+                lockdep_set_class(&port->lock, &port_lock_key);
+        }
 
         uart_configure_port(drv, state, port);