printer gadget: BKL pushdown

Add explicit lock_kernel() calls to printer_open()

Signed-off-by: Jonathan Corbet <corbet@lwn.net>

diff --git a/drivers/usb/gadget/printer.c b/drivers/usb/gadget/printer.c
index 76be75e..ec8f2eb 100644 (file)
--- 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;
 }