4 files changed, 13 insertions, 1 deletions

diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index de17738..9218cca 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -565,6 +565,7 @@ static int usbdev_open(struct inode *inode, struct file *file)
 	struct dev_state *ps;
 	int ret;
 
+	lock_kernel();
 	/* Protect against simultaneous removal or release */
 	mutex_lock(&usbfs_mutex);
 
@@ -611,6 +612,7 @@ static int usbdev_open(struct inode *inode, struct file *file)
 	if (ret)
 		kfree(ps);
 	mutex_unlock(&usbfs_mutex);
+	unlock_kernel();
 	return ret;
 }
 
diff --git a/drivers/usb/core/file.c b/drivers/usb/core/file.c
index 8133c99..c6a9539 100644
--- a/drivers/usb/core/file.c
+++ b/drivers/usb/core/file.c
@@ -18,6 +18,7 @@
 #include <linux/module.h>
 #include <linux/errno.h>
 #include <linux/rwsem.h>
+#include <linux/smp_lock.h>
 #include <linux/usb.h>
 
 #include "usb.h"
@@ -33,6 +34,7 @@ static int usb_open(struct inode * inode, struct file * file)
 	int err = -ENODEV;
 	const struct file_operations *old_fops, *new_fops = NULL;
 
+	lock_kernel();
 	down_read(&minor_rwsem);
 	c = usb_minors[minor];
 
@@ -51,6 +53,7 @@ static int usb_open(struct inode * inode, struct file * file)
 	fops_put(old_fops);
  done:
 	up_read(&minor_rwsem);
+	unlock_kernel();
 	return err;
 }
 
diff --git a/drivers/usb/gadget/printer.c b/drivers/usb/gadget/printer.c
index 76be75e..ec8f2eb 100644
--- a/drivers/usb/gadget/printer.c
+++ b/drivers/usb/gadget/printer.c
@@ -462,6 +462,7 @@ printer_open(struct inode *inode, struct file *fd)
 	unsigned long		flags;
 	int			ret = -EBUSY;
 
+	lock_kernel();
 	dev = container_of(inode->i_cdev, struct printer_dev, printer_cdev);
 
 	spin_lock_irqsave(&dev->lock, flags);
@@ -477,7 +478,7 @@ printer_open(struct inode *inode, struct file *fd)
 	spin_unlock_irqrestore(&dev->lock, flags);
 
 	DBG(dev, "printer_open returned %x\n", ret);
-
+	unlock_kernel();
 	return ret;
 }
 
diff --git a/drivers/usb/mon/mon_bin.c b/drivers/usb/mon/mon_bin.c
index 4914553..293a462 100644
--- a/drivers/usb/mon/mon_bin.c
+++ b/drivers/usb/mon/mon_bin.c
@@ -15,6 +15,7 @@
 #include <linux/poll.h>
 #include <linux/compat.h>
 #include <linux/mm.h>
+#include <linux/smp_lock.h>
 
 #include <asm/uaccess.h>
 
@@ -527,14 +528,17 @@ static int mon_bin_open(struct inode *inode, struct file *file)
 	size_t size;
 	int rc;
 
+	lock_kernel();
 	mutex_lock(&mon_lock);
 	if ((mbus = mon_bus_lookup(iminor(inode))) == NULL) {
 		mutex_unlock(&mon_lock);
+		unlock_kernel();
 		return -ENODEV;
 	}
 	if (mbus != &mon_bus0 && mbus->u_bus == NULL) {
 		printk(KERN_ERR TAG ": consistency error on open\n");
 		mutex_unlock(&mon_lock);
+		unlock_kernel();
 		return -ENODEV;
 	}
 
@@ -568,6 +572,7 @@ static int mon_bin_open(struct inode *inode, struct file *file)
 
 	file->private_data = rp;
 	mutex_unlock(&mon_lock);
+	unlock_kernel();
 	return 0;
 
 err_allocbuff:
@@ -576,6 +581,7 @@ err_allocvec:
 	kfree(rp);
 err_alloc:
 	mutex_unlock(&mon_lock);
+	unlock_kernel();
 	return rc;
 }