[Devel] [RFC][PATCH 1/5]: Move tty lookup/reopen to caller

[sukadev at us.ibm.com]

get_node() cleanup in devpts

This patchset adds inode/tty parameter to devpts interfaces and uses
this new parameter to remove the unnecessary get_node() calls in devpts
(as pointed out by Peter Anvin).

Alan, if these are getting in your way, I can hold off for now, but
just wanted some quick comments from you on patch 1 and from Peter
on get_node() cleanup.

----

From: Sukadev Bhattiprolu <sukadev at us.ibm.com>
Subject: [RFC][PATCH 1/5]: Move tty lookup/reopen to caller

Move tty_driver_lookup_tty() and tty_reopen() from tty_init_dev()
into tty_open() (one of the two callers of tty_init_dev()).  These
calls are not really required in ptmx_open(), the other caller,
since ptmx_open() would be setting up a new tty.

Changelog[v2]:
	- remove the lookup and reopen calls from ptmx_open
	- merge with recent changes to ttydev tree

---
 drivers/char/tty_io.c |   31 ++++++++++++++++---------------
 1 file changed, 16 insertions(+), 15 deletions(-)

Index: linux-2.6.27-rc3-tty/drivers/char/tty_io.c
===================================================================
--- linux-2.6.27-rc3-tty.orig/drivers/char/tty_io.c	2008-08-28 15:26:34.000000000 -0700
+++ linux-2.6.27-rc3-tty/drivers/char/tty_io.c	2008-08-28 16:16:29.000000000 -0700
@@ -1366,19 +1366,6 @@ struct tty_struct *tty_init_dev(struct t
 	struct tty_struct *tty;
 	int retval;
 
-	/* check whether we're reopening an existing tty */
-	tty = tty_driver_lookup_tty(driver, idx);
-
-	if (IS_ERR(tty))
-		return tty;
-
-	if (tty) {
-		retval = tty_reopen(tty);
-		if (retval)
-			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)
@@ -1780,7 +1767,7 @@ void tty_release_dev(struct file *filp)
 
 static int __tty_open(struct inode *inode, struct file *filp)
 {
-	struct tty_struct *tty;
+	struct tty_struct *tty = NULL;
 	int noctty, retval;
 	struct tty_driver *driver;
 	int index;
@@ -1837,7 +1824,21 @@ retry_open:
 		return -ENODEV;
 	}
 got_driver:
-	tty = tty_init_dev(driver, index, 0);
+	if (!tty) {
+		/* check whether we're reopening an existing tty */
+		tty = tty_driver_lookup_tty(driver, index);
+
+		if (IS_ERR(tty))
+			return PTR_ERR(tty);
+	}
+
+	if (tty) {
+		retval = tty_reopen(tty);
+		if (retval)
+			tty = ERR_PTR(retval);
+	} else
+		tty = tty_init_dev(driver, index, 0);
+
 	mutex_unlock(&tty_mutex);
 	tty_driver_kref_put(driver);
 	if (IS_ERR(tty))
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