diff options
| author | Ingo Molnar <mingo@elte.hu> | 2006-07-03 00:25:03 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-07-03 15:27:06 -0700 |
| commit | 13e83599d282ddfd544600df9db5ab343ac4662f (patch) | |
| tree | 85a75807442a52f672d454326453400c50aea0b7 /drivers/serial/serial_core.c | |
| parent | d8aa905b429700e8b6b6b301a8ac2d4a24f2c19b (diff) | |
| download | lwn-13e83599d282ddfd544600df9db5ab343ac4662f.tar.gz lwn-13e83599d282ddfd544600df9db5ab343ac4662f.zip | |
[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>
Diffstat (limited to 'drivers/serial/serial_core.c')
| -rw-r--r-- | drivers/serial/serial_core.c | 11 |
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); |