#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
-#include <linux/smp_lock.h>
#include <linux/completion.h>
#include <linux/mutex.h>
#include <asm/uaccess.h>
USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT, value, index, NULL, 0, 1000)
MODULE_DEVICE_TABLE(usb, idmouse_table);
+static DEFINE_MUTEX(open_disc_mutex);
/* structure to hold all of our device specific stuff */
struct usb_idmouse {
int open; /* if the port is open or not */
int present; /* if the device is not disconnected */
- struct semaphore sem; /* locks this structure */
+ struct mutex lock; /* locks this structure */
};
.id_table = idmouse_table,
};
-/* prevent races between open() and disconnect() */
-static DEFINE_MUTEX(disconnect_mutex);
-
static int idmouse_create_image(struct usb_idmouse *dev)
{
int bytes_read;
struct usb_interface *interface;
int result;
- /* prevent disconnects */
- mutex_lock(&disconnect_mutex);
-
/* get the interface from minor number and driver information */
interface = usb_find_interface (&idmouse_driver, iminor (inode));
- if (!interface) {
- mutex_unlock(&disconnect_mutex);
+ if (!interface)
return -ENODEV;
- }
+
+ mutex_lock(&open_disc_mutex);
/* get the device information block from the interface */
dev = usb_get_intfdata(interface);
if (!dev) {
- mutex_unlock(&disconnect_mutex);
+ mutex_unlock(&open_disc_mutex);
return -ENODEV;
}
/* lock this device */
- down(&dev->sem);
+ mutex_lock(&dev->lock);
+ mutex_unlock(&open_disc_mutex);
/* check if already open */
if (dev->open) {
error:
/* unlock this device */
- up(&dev->sem);
-
- /* unlock the disconnect semaphore */
- mutex_unlock(&disconnect_mutex);
+ mutex_unlock(&dev->lock);
return result;
}
{
struct usb_idmouse *dev;
- /* prevent a race condition with open() */
- mutex_lock(&disconnect_mutex);
-
dev = file->private_data;
- if (dev == NULL) {
- mutex_unlock(&disconnect_mutex);
+ if (dev == NULL)
return -ENODEV;
- }
+ mutex_lock(&open_disc_mutex);
/* lock our device */
- down(&dev->sem);
+ mutex_lock(&dev->lock);
/* are we really open? */
if (dev->open <= 0) {
- up(&dev->sem);
- mutex_unlock(&disconnect_mutex);
+ mutex_unlock(&dev->lock);
+ mutex_unlock(&open_disc_mutex);
return -ENODEV;
}
if (!dev->present) {
/* the device was unplugged before the file was released */
- up(&dev->sem);
+ mutex_unlock(&dev->lock);
+ mutex_unlock(&open_disc_mutex);
idmouse_delete(dev);
- mutex_unlock(&disconnect_mutex);
- return 0;
+ } else {
+ mutex_unlock(&dev->lock);
+ mutex_unlock(&open_disc_mutex);
}
-
- up(&dev->sem);
- mutex_unlock(&disconnect_mutex);
return 0;
}
int result;
/* lock this object */
- down(&dev->sem);
+ mutex_lock(&dev->lock);
/* verify that the device wasn't unplugged */
if (!dev->present) {
- up(&dev->sem);
+ mutex_unlock(&dev->lock);
return -ENODEV;
}
result = simple_read_from_buffer(buffer, count, ppos,
dev->bulk_in_buffer, IMGSIZE);
/* unlock the device */
- up(&dev->sem);
+ mutex_unlock(&dev->lock);
return result;
}
if (dev == NULL)
return -ENOMEM;
- init_MUTEX(&dev->sem);
+ mutex_init(&dev->lock);
dev->udev = udev;
dev->interface = interface;
{
struct usb_idmouse *dev;
- /* prevent races with open() */
- mutex_lock(&disconnect_mutex);
-
/* get device structure */
dev = usb_get_intfdata(interface);
- usb_set_intfdata(interface, NULL);
-
- /* lock it */
- down(&dev->sem);
/* give back our minor */
usb_deregister_dev(interface, &idmouse_class);
+ mutex_lock(&open_disc_mutex);
+ usb_set_intfdata(interface, NULL);
+ /* lock the device */
+ mutex_lock(&dev->lock);
+ mutex_unlock(&open_disc_mutex);
+
/* prevent device read, write and ioctl */
dev->present = 0;
- /* unlock */
- up(&dev->sem);
-
/* if the device is opened, idmouse_release will clean this up */
- if (!dev->open)
+ if (!dev->open) {
+ mutex_unlock(&dev->lock);
idmouse_delete(dev);
+ } else {
+ /* unlock */
+ mutex_unlock(&dev->lock);
+ }
- mutex_unlock(&disconnect_mutex);
-
- info("%s disconnected", DRIVER_DESC);
+ dev_info(&interface->dev, "disconnected\n");
}
static int __init usb_idmouse_init(void)
{
int result;
- info(DRIVER_DESC " " DRIVER_VERSION);
+ printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
+ DRIVER_DESC "\n");
/* register this driver with the USB subsystem */
result = usb_register(&idmouse_driver);