vserver 1.9.5.x5

[linux-2.6.git] / include / linux / serio.h

diff --git a/include/linux/serio.h b/include/linux/serio.h
index f84b362..fc387e4 100644 (file)
--- a/include/linux/serio.h
+++ b/include/linux/serio.h
@@ -45,7 +45,8 @@ struct serio {
 
        struct serio *parent, *child;
 
-       struct serio_driver *drv;       /* accessed from interrupt, must be protected by serio->lock */
+       struct serio_driver *drv;       /* accessed from interrupt, must be protected by serio->lock and serio->sem */
+       struct semaphore drv_sem;       /* protects serio->drv so attributes can pin driver */
 
        struct device dev;
 
@@ -122,6 +123,19 @@ static __inline__ void serio_continue_rx(struct serio *serio)
        spin_unlock_irq(&serio->lock);
 }
 
+/*
+ * Use the following fucntions to pin serio's driver in process context
+ */
+static __inline__ int serio_pin_driver(struct serio *serio)
+{
+       return down_interruptible(&serio->drv_sem);
+}
+
+static __inline__ void serio_unpin_driver(struct serio *serio)
+{
+       up(&serio->drv_sem);
+}
+
 
 #endif