USB: Push BKL on open down into the drivers

Straightforward push into the drivers to allow
auditing individual drivers separately

Signed-off-by: Oliver Neukum <oliver@neukum.org>
Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 8 insertions, 1 deletions

diff --git a/drivers/usb/misc/vstusb.c b/drivers/usb/misc/vstusb.c
index 874c81bb27b..b787b25d4cc 100644
--- a/drivers/usb/misc/vstusb.c
+++ b/drivers/usb/misc/vstusb.c
@@ -27,6 +27,7 @@
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
+#include <linux/smp_lock.h>
 #include <linux/uaccess.h>
 #include <linux/usb.h>
 
@@ -103,19 +104,23 @@ static int vstusb_open(struct inode *inode, struct file *file)
 	struct vstusb_device *vstdev;
 	struct usb_interface *interface;
 
+	lock_kernel();
 	interface = usb_find_interface(&vstusb_driver, iminor(inode));
 
 	if (!interface) {
 		printk(KERN_ERR KBUILD_MODNAME
 		       ": %s - error, can't find device for minor %d\n",
 		       __func__, iminor(inode));
+		unlock_kernel();
 		return -ENODEV;
 	}
 
 	vstdev = usb_get_intfdata(interface);
 
-	if (!vstdev)
+	if (!vstdev) {
+		unlock_kernel();
 		return -ENODEV;
+	}
 
 	/* lock this device */
 	mutex_lock(&vstdev->lock);
@@ -123,6 +128,7 @@ static int vstusb_open(struct inode *inode, struct file *file)
 	/* can only open one time */
 	if ((!vstdev->present) || (vstdev->isopen)) {
 		mutex_unlock(&vstdev->lock);
+		unlock_kernel();
 		return -EBUSY;
 	}
 
@@ -137,6 +143,7 @@ static int vstusb_open(struct inode *inode, struct file *file)
 	dev_dbg(&vstdev->usb_dev->dev, "%s: opened\n", __func__);
 
 	mutex_unlock(&vstdev->lock);
+	unlock_kernel();
 
 	return 0;
 }