This applies on top of the changes already in staging-next branch which allow
kernel access to TTY dev.
Signe-doff-by: Okash Khawaja <[email protected]>
Reviewed-by: Samuel Thibault <[email protected]>
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)
{ }