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, 7 insertions, 1 deletions

diff --git a/drivers/usb/misc/idmouse.c b/drivers/usb/misc/idmouse.c
index a54c3cb804c..68df9ac7669 100644
--- a/drivers/usb/misc/idmouse.c
+++ b/drivers/usb/misc/idmouse.c
@@ -24,6 +24,7 @@
 #include <linux/module.h>
 #include <linux/completion.h>
 #include <linux/mutex.h>
+#include <linux/smp_lock.h>
 #include <asm/uaccess.h>
 #include <linux/usb.h>
 
@@ -226,16 +227,20 @@ static int idmouse_open(struct inode *inode, struct file *file)
 	struct usb_interface *interface;
 	int result;
 
+	lock_kernel();
 	/* get the interface from minor number and driver information */
 	interface = usb_find_interface (&idmouse_driver, iminor (inode));
-	if (!interface)
+	if (!interface) {
+		unlock_kernel();
 		return -ENODEV;
+	}
 
 	mutex_lock(&open_disc_mutex);
 	/* get the device information block from the interface */
 	dev = usb_get_intfdata(interface);
 	if (!dev) {
 		mutex_unlock(&open_disc_mutex);
+		unlock_kernel();
 		return -ENODEV;
 	}
 
@@ -272,6 +277,7 @@ error:
 
 	/* unlock this device */
 	mutex_unlock(&dev->lock);
+	unlock_kernel();
 	return result;
 }