rocket: Prepare for BKL pushdown

Wrap the ioctl code in lock_kernel calls

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 18 insertions, 9 deletions

diff --git a/drivers/char/rocket.c b/drivers/char/rocket.c
index f585bc8579e9..1b3fc6fd358e 100644
--- a/drivers/char/rocket.c
+++ b/drivers/char/rocket.c
@@ -1433,29 +1433,38 @@ static int rp_ioctl(struct tty_struct *tty, struct file *file,
 {
         struct r_port *info = (struct r_port *) tty->driver_data;
         void __user *argp = (void __user *)arg;
+        int ret = 0;
 
         if (cmd != RCKP_GET_PORTS && rocket_paranoia_check(info, "rp_ioctl"))
                 return -ENXIO;
 
+        lock_kernel();
+
         switch (cmd) {
         case RCKP_GET_STRUCT:
                 if (copy_to_user(argp, info, sizeof (struct r_port)))
-                        return -EFAULT;
-                return 0;
+                        ret = -EFAULT;
+                break;
         case RCKP_GET_CONFIG:
-                return get_config(info, argp);
+                ret = get_config(info, argp);
+                break;
         case RCKP_SET_CONFIG:
-                return set_config(info, argp);
+                ret = set_config(info, argp);
+                break;
         case RCKP_GET_PORTS:
-                return get_ports(info, argp);
+                ret = get_ports(info, argp);
+                break;
         case RCKP_RESET_RM2:
-                return reset_rm2(info, argp);
+                ret = reset_rm2(info, argp);
+                break;
         case RCKP_GET_VERSION:
-                return get_version(info, argp);
+                ret = get_version(info, argp);
+                break;
         default:
-                return -ENOIOCTLCMD;
+                ret = -ENOIOCTLCMD;
         }
-        return 0;
+        unlock_kernel();
+        return ret;
 }
 
 static void rp_send_xchar(struct tty_struct *tty, char ch)