+ struct tty_struct *o_tty;
+ int idx = tty->index;
+
+ o_tty = alloc_tty_struct();
+ if (!o_tty)
+ return -ENOMEM;
+ if (!try_module_get(driver->other->owner)) {
+ /* This cannot in fact currently happen */
+ free_tty_struct(o_tty);
+ return -ENOMEM;
+ }
+ initialize_tty_struct(o_tty, driver->other, idx);
+
+ tty->termios = kmalloc(sizeof(struct ktermios), GFP_KERNEL);
+ if (tty->termios == NULL)
+ goto free_mem_out;
+ *tty->termios = driver->init_termios;
+ tty->termios_locked = kzalloc(sizeof(struct ktermios), GFP_KERNEL);
+ if (tty->termios_locked == NULL)
+ goto free_mem_out;
+ o_tty->termios = kmalloc(sizeof(struct ktermios), GFP_KERNEL);
+ if (o_tty->termios == NULL)
+ goto free_mem_out;
+ *o_tty->termios = driver->other->init_termios;
+ o_tty->termios_locked = kzalloc(sizeof(struct ktermios), GFP_KERNEL);
+ if (o_tty->termios_locked == NULL)
+ goto free_mem_out;
+
+ tty_driver_kref_get(driver->other);
+ if (driver->subtype == PTY_TYPE_MASTER)
+ o_tty->count++;
+ /* Establish the links in both directions */
+ tty->link = o_tty;
+ o_tty->link = tty;
+ /*
+ * All structures have been allocated, so now we install them.
+ * Failures after this point use release_tty to clean up, so
+ * there's no need to null out the local pointers.
+ */
+ tty_driver_kref_get(driver);
+ tty->count++;
+ pty_count++;