tty: More driver operations
We have the lookup operation abstracted which is nice for pty cleanup but
we really want to abstract the add/remove entries as well so that we can
pull the pty code out of the tty core and create a clear defined interface
for the tty driver table.
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index 47aa437..888380f 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -1189,7 +1189,7 @@
}
/**
- * 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
@@ -1222,13 +1222,51 @@
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.
*
@@ -1423,11 +1461,7 @@
* 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;
@@ -1441,6 +1475,9 @@
tty_driver_kref_get(driver);
tty->count++;
+ if (tty_driver_install_tty(driver, tty) < 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
@@ -1502,7 +1539,7 @@
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);
@@ -1615,7 +1652,7 @@
"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);
