[patch 2/6] tty: export tty_open_by_driver

[Okash Khawaja]

This applies on top of the changes already in staging-next branch which allow
kernel access to TTY dev.

Signe-doff-by: Okash Khawaja <okash.khaw...@gmail.com>
Reviewed-by: Samuel Thibault <samuel.thiba...@ens-lyon.org>

Index: linux-staging/drivers/tty/tty_io.c
===================================================================
--- linux-staging.orig/drivers/tty/tty_io.c
+++ linux-staging/drivers/tty/tty_io.c
@@ -1369,7 +1369,10 @@ static struct tty_struct *tty_driver_loo
        struct tty_struct *tty;
 
        if (driver->ops->lookup)
-               tty = driver->ops->lookup(driver, file, idx);
+               if (!file)
+                       tty = ERR_PTR(-EIO);
+               else
+                       tty = driver->ops->lookup(driver, file, idx);
        else
                tty = driver->ttys[idx];
 
@@ -2001,7 +2004,7 @@ static struct tty_driver *tty_lookup_dri
                struct tty_driver *console_driver = console_device(index);
                if (console_driver) {
                        driver = tty_driver_kref_get(console_driver);
-                       if (driver) {
+                       if (driver && filp) {
                                /* Don't let /dev/console block */
                                filp->f_flags |= O_NONBLOCK;
                                break;
@@ -2034,7 +2037,7 @@ static struct tty_driver *tty_lookup_dri
  *       - concurrent tty driver removal w/ lookup
  *       - concurrent tty removal from driver table
  */
-static struct tty_struct *tty_open_by_driver(dev_t device, struct inode *inode,
+struct tty_struct *tty_open_by_driver(dev_t device, struct inode *inode,
                                             struct file *filp)
 {
        struct tty_struct *tty;
@@ -2079,6 +2082,7 @@ out:
        tty_driver_kref_put(driver);
        return tty;
 }
+EXPORT_SYMBOL(tty_open_by_driver);
 
 /**
  *     tty_open                -       open a tty device
Index: linux-staging/include/linux/tty.h
===================================================================
--- linux-staging.orig/include/linux/tty.h
+++ linux-staging/include/linux/tty.h
@@ -401,6 +401,8 @@ extern struct tty_struct *get_current_tt
 /* tty_io.c */
 extern int __init tty_init(void);
 extern const char *tty_name(const struct tty_struct *tty);
+extern struct tty_struct *tty_open_by_driver(dev_t device, struct inode *inode,
+               struct file *filp);
 #else
 static inline void console_init(void)
 { }

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