X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=include%2Flinux%2Fserio.h;h=fc387e4d8e66c9a71fc83962b8b039b28424b83e;hb=6a77f38946aaee1cd85eeec6cf4229b204c15071;hp=f84b362a561f330142e3af2473ec8e8c786569c9;hpb=87fc8d1bb10cd459024a742c6a10961fefcef18f;p=linux-2.6.git

diff --git a/include/linux/serio.h b/include/linux/serio.h
index f84b362a5..fc387e4d8 100644
--- 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