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, 3 insertions, 0 deletions

diff --git a/drivers/usb/usb-skeleton.c b/drivers/usb/usb-skeleton.c
index 61522787f39c..e94176bfd272 100644
--- a/drivers/usb/usb-skeleton.c
+++ b/drivers/usb/usb-skeleton.c
@@ -18,6 +18,7 @@
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/kref.h>
+#include <linux/smp_lock.h>
 #include <linux/uaccess.h>
 #include <linux/usb.h>
 #include <linux/mutex.h>
@@ -90,6 +91,7 @@ static int skel_open(struct inode *inode, struct file *file)
         int subminor;
         int retval = 0;
 
+        lock_kernel();
         subminor = iminor(inode);
 
         interface = usb_find_interface(&skel_driver, subminor);
@@ -135,6 +137,7 @@ static int skel_open(struct inode *inode, struct file *file)
         mutex_unlock(&dev->io_mutex);
 
 exit:
+        unlock_kernel();
         return retval;
 }