usbcore: cdev lock_kernel() pushdown

usb_open() is protected by a down_read(&minor_rwsem), but I'm not sure I
trust it to protect everything including subsidiary open() functions.

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

diff --git a/drivers/usb/core/file.c b/drivers/usb/core/file.c
index 8133c99..c6a9539 100644 (file)
--- 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;
 }