Pull error-inject into release branch

[powerpc.git] / drivers / usb / misc / usblcd.c

diff --git a/drivers/usb/misc/usblcd.c b/drivers/usb/misc/usblcd.c
index dbaca9f..887ef95 100644 (file)
--- a/drivers/usb/misc/usblcd.c
+++ b/drivers/usb/misc/usblcd.c
@@ -47,6 +47,7 @@ struct usb_lcd {
 #define to_lcd_dev(d) container_of(d, struct usb_lcd, kref)
 
 static struct usb_driver lcd_driver;
+static DEFINE_MUTEX(usb_lcd_open_mutex);
 
 
 static void lcd_delete(struct kref *kref)
@@ -68,6 +69,7 @@ static int lcd_open(struct inode *inode, struct file *file)
 
        subminor = iminor(inode);
 
+       mutex_lock(&usb_lcd_open_mutex);
        interface = usb_find_interface(&lcd_driver, subminor);
        if (!interface) {
                err ("USBLCD: %s - error, can't find device for minor %d",
@@ -89,6 +91,7 @@ static int lcd_open(struct inode *inode, struct file *file)
        file->private_data = dev;
 
 exit:
+       mutex_unlock(&usb_lcd_open_mutex);
        return retval;
 }
 
@@ -165,7 +168,7 @@ static int lcd_ioctl(struct inode *inode, struct file *file, unsigned int cmd, u
        return 0;
 }
 
-static void lcd_write_bulk_callback(struct urb *urb, struct pt_regs *regs)
+static void lcd_write_bulk_callback(struct urb *urb)
 {
        struct usb_lcd *dev;
 
@@ -347,7 +350,7 @@ static void lcd_disconnect(struct usb_interface *interface)
         int minor = interface->minor;
 
         /* prevent skel_open() from racing skel_disconnect() */
-        lock_kernel();
+        mutex_lock(&usb_lcd_open_mutex);
 
         dev = usb_get_intfdata(interface);
         usb_set_intfdata(interface, NULL);
@@ -355,7 +358,7 @@ static void lcd_disconnect(struct usb_interface *interface)
         /* give back our minor */
         usb_deregister_dev(interface, &lcd_class);
  
-       unlock_kernel();
+       mutex_unlock(&usb_lcd_open_mutex);
 
        /* decrement our usage count */
        kref_put(&dev->kref, lcd_delete);