}
/**
- * pty_line_name - generate name for a tty
+ * tty_line_name - generate name for a tty
* @driver: the tty driver in use
* @index: the minor number
* @p: output buffer of at least 7 bytes
if (driver->ops->lookup)
return driver->ops->lookup(driver, idx);
- tty = driver->ttys[idx];
+ tty = driver->ttys[idx];
return tty;
}
/**
- * tty_reopen() - fast re-open of an open tty
- * @tty - the tty to open
+ * tty_driver_install_tty() - install a tty entry in the driver
+ * @driver: the driver for the tty
+ * @tty: the tty
+ *
+ * Install a tty object into the driver tables. The tty->index field
+ * will be set by the time this is called.
+ *
+ * Locking: tty_mutex for now
+ */
+static int tty_driver_install_tty(struct tty_driver *driver,
+ struct tty_struct *tty)
+{
+ if (driver->ops->install)
+ return driver->ops->install(driver, tty);
+ driver->ttys[tty->index] = tty;
+ return 0;
+}
+
+/**
+ * tty_driver_remove_tty() - remove a tty from the driver tables
+ * @driver: the driver for the tty
+ * @idx: the minor number
+ *
+ * Remvoe a tty object from the driver tables. The tty->index field
+ * will be set by the time this is called.
+ *
+ * Locking: tty_mutex for now
+ */
+static void tty_driver_remove_tty(struct tty_driver *driver,
+ struct tty_struct *tty)
+{
+ if (driver->ops->remove)
+ driver->ops->remove(driver, tty);
+ else
+ driver->ttys[tty->index] = NULL;
+}
+
+/*
+ * tty_reopen() - fast re-open of an open tty
+ * @tty - the tty to open
*
* Return 0 on success, -errno on error.
*
* relaxed for the (most common) case of reopening a tty.
*/
-int tty_init_dev(struct tty_driver *driver, int idx,
- struct tty_struct **ret_tty, int first_ok)
+struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx,
+ int first_ok)
{
struct tty_struct *tty, *o_tty;
struct ktermios *tp, **tp_loc, *o_tp, **o_tp_loc;
struct ktermios *ltp, **ltp_loc, *o_ltp, **o_ltp_loc;
- int retval = 0;
+ int retval;
/* check whether we're reopening an existing tty */
tty = tty_driver_lookup_tty(driver, idx);
- if (IS_ERR(tty)) {
- retval = PTR_ERR(tty);
- goto end_init;
- }
+
+ if (IS_ERR(tty))
+ return tty;
if (tty) {
retval = tty_reopen(tty);
if (retval)
- return retval;
- *ret_tty = tty;
- return 0;
+ return ERR_PTR(retval);
+ return tty;
}
/* Check if pty master is being opened multiple times */
if (driver->subtype == PTY_TYPE_MASTER &&
- (driver->flags & TTY_DRIVER_DEVPTS_MEM) && !first_ok) {
- retval = -EIO;
- goto end_init;
- }
+ (driver->flags & TTY_DRIVER_DEVPTS_MEM) && !first_ok)
+ return ERR_PTR(-EIO);
+
/*
* First time open is complex, especially for PTY devices.
* This code guarantees that either everything succeeds and the
* and locked termios may be retained.)
*/
- if (!try_module_get(driver->owner)) {
- retval = -ENODEV;
- goto end_init;
- }
+ if (!try_module_get(driver->owner))
+ return ERR_PTR(-ENODEV);
o_tty = NULL;
tp = o_tp = NULL;
* 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.
- *
- * FIXME: We want a 'driver->install method ?
*/
- if (!(driver->flags & TTY_DRIVER_DEVPTS_MEM))
- driver->ttys[idx] = tty;
if (!*tp_loc)
*tp_loc = tp;
tty_driver_kref_get(driver);
tty->count++;
+ retval = tty_driver_install_tty(driver, tty);
+ if (retval < 0)
+ goto release_mem_out;
+
/*
* Structures all installed ... call the ldisc open routines.
* If we fail here just call release_tty to clean up. No need
*/
retval = tty_ldisc_setup(tty, o_tty);
-
if (retval)
goto release_mem_out;
-
- *ret_tty = tty;
- /* All paths come through here to release the mutex */
-end_init:
- return retval;
+ return tty;
/* Release locally allocated memory ... nothing placed in slots */
free_mem_out:
fail_no_mem:
module_put(driver->owner);
- retval = -ENOMEM;
- goto end_init;
+ return ERR_PTR(-ENOMEM);
/* call the tty release_tty routine to clean out this slot */
release_mem_out:
printk(KERN_INFO "tty_init_dev: ldisc open failed, "
"clearing slot %d\n", idx);
release_tty(tty, idx);
- goto end_init;
+ return ERR_PTR(retval);
}
void tty_free_termios(struct tty_struct *tty)
void tty_shutdown(struct tty_struct *tty)
{
- tty->driver->ttys[tty->index] = NULL;
+ tty_driver_remove_tty(tty->driver, tty);
tty_free_termios(tty);
}
EXPORT_SYMBOL(tty_shutdown);
"free (%s)\n", tty->name);
return;
}
- if (!(tty->driver->flags & TTY_DRIVER_DEVPTS_MEM)) {
+ if (!devpts) {
if (tty != tty->driver->ttys[idx]) {
printk(KERN_DEBUG "tty_release_dev: driver.table[%d] not tty "
"for (%s)\n", idx, tty->name);
return -ENODEV;
}
got_driver:
- retval = tty_init_dev(driver, index, &tty, 0);
+ tty = tty_init_dev(driver, index, 0);
mutex_unlock(&tty_mutex);
tty_driver_kref_put(driver);
- if (retval)
- return retval;
+ if (IS_ERR(tty))
+ return PTR_ERR(tty);
filp->private_data = tty;
file_move(filp, &tty->tty_files);
projects / linux-2.6-omap-h63xx.git / blobdiff