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>
diff --git a/drivers/usb/misc/usblcd.c b/drivers/usb/misc/usblcd.c
index 499d750..90aede9 100644
--- a/drivers/usb/misc/usblcd.c
+++ b/drivers/usb/misc/usblcd.c
@@ -74,10 +74,12 @@
struct usb_interface *interface;
int subminor, r;
+ lock_kernel();
subminor = iminor(inode);
interface = usb_find_interface(&lcd_driver, subminor);
if (!interface) {
+ unlock_kernel();
err ("USBLCD: %s - error, can't find device for minor %d",
__func__, subminor);
return -ENODEV;
@@ -87,6 +89,7 @@
dev = usb_get_intfdata(interface);
if (!dev) {
mutex_unlock(&open_disc_mutex);
+ unlock_kernel();
return -ENODEV;
}
@@ -98,11 +101,13 @@
r = usb_autopm_get_interface(interface);
if (r < 0) {
kref_put(&dev->kref, lcd_delete);
+ unlock_kernel();
return r;
}
/* save our object in the file's private structure */
file->private_data = dev;
+ unlock_kernel();
return 0;
}