TTY: coalesce fail paths in tty_open
Move them to the end of the function and use gotos as usual.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 00b8498..ba9194e 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -1916,27 +1916,20 @@
tty = tty_open_current_tty(device, filp);
if (IS_ERR(tty)) {
- tty_unlock();
- mutex_unlock(&tty_mutex);
- tty_free_file(filp);
- return PTR_ERR(tty);
+ retval = PTR_ERR(tty);
+ goto err_unlock;
} else if (!tty) {
driver = tty_lookup_driver(device, filp, &noctty, &index);
if (IS_ERR(driver)) {
- tty_unlock();
- mutex_unlock(&tty_mutex);
- tty_free_file(filp);
- return PTR_ERR(driver);
+ retval = PTR_ERR(driver);
+ goto err_unlock;
}
/* check whether we're reopening an existing tty */
tty = tty_driver_lookup_tty(driver, inode, index);
if (IS_ERR(tty)) {
- tty_unlock();
- mutex_unlock(&tty_mutex);
- tty_driver_kref_put(driver);
- tty_free_file(filp);
- return PTR_ERR(tty);
+ retval = PTR_ERR(tty);
+ goto err_unlock;
}
}
@@ -1952,8 +1945,8 @@
tty_driver_kref_put(driver);
if (IS_ERR(tty)) {
tty_unlock();
- tty_free_file(filp);
- return PTR_ERR(tty);
+ retval = PTR_ERR(tty);
+ goto err_file;
}
tty_add_file(tty, filp);
@@ -2013,6 +2006,15 @@
tty_unlock();
mutex_unlock(&tty_mutex);
return 0;
+err_unlock:
+ tty_unlock();
+ mutex_unlock(&tty_mutex);
+ /* after locks to avoid deadlock */
+ if (!IS_ERR_OR_NULL(driver))
+ tty_driver_kref_put(driver);
+err_file:
+ tty_free_file(filp);
+ return retval;
}