/*
- * linux/drivers/char/tty_io.c
- *
* Copyright (C) 1991, 1992 Linus Torvalds
*/
}
void tty_write_unlock(struct tty_struct *tty)
+ __releases(&tty->atomic_write_lock)
{
mutex_unlock(&tty->atomic_write_lock);
wake_up_interruptible_poll(&tty->write_wait, POLLOUT);
}
int tty_write_lock(struct tty_struct *tty, int ndelay)
+ __acquires(&tty->atomic_write_lock)
{
if (!mutex_trylock(&tty->atomic_write_lock)) {
if (ndelay)
return ERR_PTR(-ENODEV);
tty = alloc_tty_struct();
- if (!tty)
- goto fail_no_mem;
+ if (!tty) {
+ retval = -ENOMEM;
+ goto err_module_put;
+ }
initialize_tty_struct(tty, driver, idx);
retval = tty_driver_install_tty(driver, tty);
- if (retval < 0) {
- free_tty_struct(tty);
- module_put(driver->owner);
- return ERR_PTR(retval);
- }
+ if (retval < 0)
+ goto err_deinit_tty;
/*
* Structures all installed ... call the ldisc open routines.
*/
retval = tty_ldisc_setup(tty, tty->link);
if (retval)
- goto release_mem_out;
+ goto err_release_tty;
return tty;
-fail_no_mem:
+err_deinit_tty:
+ deinitialize_tty_struct(tty);
+ free_tty_struct(tty);
+err_module_put:
module_put(driver->owner);
- return ERR_PTR(-ENOMEM);
+ return ERR_PTR(retval);
/* call the tty release_tty routine to clean out this slot */
-release_mem_out:
+err_release_tty:
if (printk_ratelimit())
printk(KERN_INFO "tty_init_dev: ldisc open failed, "
"clearing slot %d\n", idx);
retval = tty_add_file(tty, filp);
if (retval) {
tty_unlock();
+ tty_release(inode, filp);
return retval;
}
#ifdef TTY_DEBUG_HANGUP
printk(KERN_DEBUG "opening %s...", tty->name);
#endif
- if (!retval) {
- if (tty->ops->open)
- retval = tty->ops->open(tty, filp);
- else
- retval = -ENODEV;
- }
+ if (tty->ops->open)
+ retval = tty->ops->open(tty, filp);
+ else
+ retval = -ENODEV;
filp->f_flags = saved_flags;
if (!retval && test_bit(TTY_EXCLUSIVE, &tty->flags) &&
tty->dev = tty_get_device(tty);
}
+/**
+ * deinitialize_tty_struct
+ * @tty: tty to deinitialize
+ *
+ * This subroutine deinitializes a tty structure that has been newly
+ * allocated but tty_release cannot be called on that yet.
+ *
+ * Locking: none - tty in question must not be exposed at this point
+ */
+void deinitialize_tty_struct(struct tty_struct *tty)
+{
+ tty_ldisc_deinit(tty);
+}
+
/**
* tty_put_char - write one character to a tty
* @tty: tty