TTY: move tty_lookup_driver to switch-cases

The labels express more the nature of the decision tree. We returned
from each if with a driver. Now we do this at the end of the function
and the code flow is clear.

While at it, remove an obsolete comment (we already take the
reference).

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 11 insertions, 8 deletions

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index ba9194e7b9c8..76e66ff5e65d 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -1841,16 +1841,17 @@ static struct tty_driver *tty_lookup_driver(dev_t device, struct file *filp,
 {
         struct tty_driver *driver;
 
+        switch (device) {
 #ifdef CONFIG_VT
-        if (device == MKDEV(TTY_MAJOR, 0)) {
+        case MKDEV(TTY_MAJOR, 0): {
                 extern struct tty_driver *console_driver;
                 driver = tty_driver_kref_get(console_driver);
                 *index = fg_console;
                 *noctty = 1;
-                return driver;
+                break;
         }
 #endif
-        if (device == MKDEV(TTYAUX_MAJOR, 1)) {
+        case MKDEV(TTYAUX_MAJOR, 1): {
                 struct tty_driver *console_driver = console_device(index);
                 if (console_driver) {
                         driver = tty_driver_kref_get(console_driver);
@@ -1858,15 +1859,17 @@ static struct tty_driver *tty_lookup_driver(dev_t device, struct file *filp,
                                 /* Don't let /dev/console block */
                                 filp->f_flags |= O_NONBLOCK;
                                 *noctty = 1;
-                                return driver;
+                                break;
                         }
                 }
                 return ERR_PTR(-ENODEV);
         }
-
-        driver = get_tty_driver(device, index);
-        if (!driver)
-                return ERR_PTR(-ENODEV);
+        default:
+                driver = get_tty_driver(device, index);
+                if (!driver)
+                        return ERR_PTR(-ENODEV);
+                break;
+        }
         return driver;
 }