tty: Clean up the tty_init_dev changes further
Fix up the naming, style and extract some bits of code into the driver
specific code
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 a540849..ac41af8 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -1204,53 +1204,38 @@
sprintf(p, "%s%d", driver->name, index + driver->name_base);
}
-/*
- * find_tty() - find an existing tty, if any
- * @driver: the driver for the tty
- * @idx: the minor number
+/**
+ * tty_driver_lookup_tty() - find an existing tty, if any
+ * @driver: the driver for the tty
+ * @idx: the minor number
*
- * Return the tty, if found or ERR_PTR() otherwise.
+ * Return the tty, if found or ERR_PTR() otherwise.
*
- * Locking: tty_mutex must be held. If tty is found, the mutex must
- * be held until the 'fast-open' is also done.
+ * Locking: tty_mutex must be held. If tty is found, the mutex must
+ * be held until the 'fast-open' is also done. Will change once we
+ * have refcounting in the driver and per driver locking
*/
-struct tty_struct *find_tty(struct tty_driver *driver, int idx)
+struct tty_struct *tty_driver_lookup_tty(struct tty_driver *driver, int idx)
{
struct tty_struct *tty;
- /* check whether we're reopening an existing tty */
- if (driver->flags & TTY_DRIVER_DEVPTS_MEM) {
- tty = devpts_get_tty(idx);
- /*
- * If we don't have a tty here on a slave open, it's because
- * the master already started the close process and there's
- * no relation between devpts file and tty anymore.
- */
- if (!tty && driver->subtype == PTY_TYPE_SLAVE)
- return ERR_PTR(-EIO);
+ if (driver->ops->lookup)
+ return driver->ops->lookup(driver, idx);
- /*
- * tty is safe on because we are called with tty_mutex held
- * and release_dev() won't change tty->count or tty->flags
- * without grabbing tty_mutex.
- */
- if (tty && driver->subtype == PTY_TYPE_MASTER)
- tty = tty->link;
- } else
tty = driver->ttys[idx];
return tty;
}
-/*
- * fast_tty_open() - fast re-open of an open tty
- * @tty - the tty to open
+/**
+ * tty_reopen() - fast re-open of an open tty
+ * @tty - the tty to open
*
- * Return 0 on success, -errno on error.
+ * Return 0 on success, -errno on error.
*
- * Locking: tty_mutex must be held from the time the tty was found
- * till this open completes.
+ * Locking: tty_mutex must be held from the time the tty was found
+ * till this open completes.
*/
-static int fast_tty_open(struct tty_struct *tty)
+static int tty_reopen(struct tty_struct *tty)
{
struct tty_driver *driver = tty->driver;
@@ -1271,9 +1256,7 @@
tty->count++;
tty->driver = driver; /* N.B. why do this every time?? */
- /* FIXME */
- if (!test_bit(TTY_LDISC, &tty->flags))
- printk(KERN_ERR "fast_tty_open: no ldisc\n");
+ WARN_ON(!test_bit(TTY_LDISC, &tty->flags));
return 0;
}
@@ -1312,14 +1295,14 @@
int retval = 0;
/* check whether we're reopening an existing tty */
- tty = find_tty(driver, idx);
+ tty = tty_driver_lookup_tty(driver, idx);
if (IS_ERR(tty)) {
retval = PTR_ERR(tty);
goto end_init;
}
if (tty) {
- retval = fast_tty_open(tty);
+ retval = tty_reopen(tty);
if (retval)
return retval;
*ret_tty = tty;
@@ -1440,6 +1423,8 @@
* 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;
@@ -1466,9 +1451,8 @@
if (retval)
goto release_mem_out;
-success:
- *ret_tty = tty;
+ *ret_tty = tty;
/* All paths come through here to release the mutex */
end_init:
return retval;
