[patch] sem2mutex input

[patch] sem2mutex input

[Jes Sorensen]

Hi,

Relative to Linus' git tree.

Cheers,
Jes


Use mutex instead of semaphore.

Signed-off-by: Jes Sorensen <jes@sgi.com>

----

 drivers/input/input.c |   15 ++++++++-------
 include/linux/input.h |    2 +-
 2 files changed, 9 insertions(+), 8 deletions(-)

Index: linux-2.6/drivers/input/input.c
===================================================================
--- linux-2.6.orig/drivers/input/input.c
+++ linux-2.6/drivers/input/input.c
@@ -21,6 +21,7 @@
 #include <linux/interrupt.h>
 #include <linux/poll.h>
 #include <linux/device.h>
+#include <linux/mutex.h>
 
 MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
 MODULE_DESCRIPTION("Input core");
@@ -224,7 +225,7 @@
 	struct input_dev *dev = handle->dev;
 	int err;
 
-	err = down_interruptible(&dev->sem);
+	err = mutex_lock_interruptible(&dev->mutex);
 	if (err)
 		return err;
 
@@ -236,7 +237,7 @@
 	if (err)
 		handle->open--;
 
-	up(&dev->sem);
+	mutex_unlock(&dev->mutex);
 
 	return err;
 }
@@ -255,13 +256,13 @@
 
 	input_release_device(handle);
 
-	down(&dev->sem);
+	mutex_lock(&dev->mutex);
 
 	if (!--dev->users && dev->close)
 		dev->close(dev);
 	handle->open--;
 
-	up(&dev->sem);
+	mutex_unlock(&dev->mutex);
 }
 
 static void input_link_handle(struct input_handle *handle)
@@ -512,13 +513,13 @@
 	struct input_dev *input_dev = to_input_dev(dev);			\
 	int retval;								\
 										\
-	retval = down_interruptible(&input_dev->sem);				\
+	retval = mutex_lock_interruptible(&input_dev->mutex);			\
 	if (retval)								\
 		return retval;							\
 										\
 	retval = sprintf(buf, "%s\n", input_dev->name ? input_dev->name : "");	\
 										\
-	up(&input_dev->sem);							\
+	mutex_unlock(&input_dev->mutex);					\
 										\
 	return retval;								\
 }										\
@@ -771,7 +772,7 @@
 		return -EINVAL;
 	}
 
-	init_MUTEX(&dev->sem);
+	mutex_init(&dev->mutex);
 	set_bit(EV_SYN, dev->evbit);
 
 	/*
Index: linux-2.6/include/linux/input.h
===================================================================
--- linux-2.6.orig/include/linux/input.h
+++ linux-2.6/include/linux/input.h
@@ -929,7 +929,7 @@
 
 	struct input_handle *grab;
 
-	struct semaphore sem;	/* serializes open and close operations */
+	struct mutex mutex;	/* serializes open and close operations */
 	unsigned int users;
 
 	struct class_device cdev;