2 files changed, 12 insertions, 1 deletions

diff --git a/drivers/serial/8250_pnp.c b/drivers/serial/8250_pnp.c
index 739bc84f91e9..632f62d6ec7e 100644
--- a/drivers/serial/8250_pnp.c
+++ b/drivers/serial/8250_pnp.c
@@ -431,6 +431,8 @@ serial_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
 #endif
 
         port.flags |= UPF_SKIP_TEST | UPF_BOOT_AUTOCONF;
+        if (pnp_irq_flags(dev, 0) & IORESOURCE_IRQ_SHAREABLE)
+                port.flags |= UPF_SHARE_IRQ;
         port.uartclk = 1843200;
         port.dev = &dev->dev;
 
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);