TTY: pdc_cons, use tty_port

Instead of digging a tty out of the tty_driver struct, which is not
defined to work, use tty_port properly. This includes proper tty
refcounting even though there is no possible race currently. But we
will need tty_port for tty buffers in the future anyway.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Helge Deller <deller@gmx.de>
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 12 insertions, 7 deletions

diff --git a/arch/parisc/kernel/pdc_cons.c b/arch/parisc/kernel/pdc_cons.c
index d14e20fc60df..4f004596a6e7 100644
--- a/arch/parisc/kernel/pdc_cons.c
+++ b/arch/parisc/kernel/pdc_cons.c
@@ -92,10 +92,11 @@ static int pdc_console_setup(struct console *co, char *options)
 
 static void pdc_console_poll(unsigned long unused);
 static DEFINE_TIMER(pdc_console_timer, pdc_console_poll, 0, 0);
+static struct tty_port tty_port;
 
 static int pdc_console_tty_open(struct tty_struct *tty, struct file *filp)
 {
-
+        tty_port_tty_set(&tty_port, tty);
         mod_timer(&pdc_console_timer, jiffies + PDC_CONS_POLL_DELAY);
 
         return 0;
@@ -103,8 +104,10 @@ static int pdc_console_tty_open(struct tty_struct *tty, struct file *filp)
 
 static void pdc_console_tty_close(struct tty_struct *tty, struct file *filp)
 {
-        if (!tty->count)
+        if (!tty->count) {
                 del_timer_sync(&pdc_console_timer);
+                tty_port_tty_set(&tty_port, NULL);
+        }
 }
 
 static int pdc_console_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
@@ -123,8 +126,6 @@ static int pdc_console_tty_chars_in_buffer(struct tty_struct *tty)
         return 0; /* no buffer */
 }
 
-static struct tty_driver *pdc_console_tty_driver;
-
 static const struct tty_operations pdc_console_tty_ops = {
         .open = pdc_console_tty_open,
         .close = pdc_console_tty_close,
@@ -135,10 +136,8 @@ static const struct tty_operations pdc_console_tty_ops = {
 
 static void pdc_console_poll(unsigned long unused)
 {
-
         int data, count = 0;
-
-        struct tty_struct *tty = pdc_console_tty_driver->ttys[0];
+        struct tty_struct *tty = tty_port_tty_get(&tty_port);
 
         if (!tty)
                 return;
@@ -154,10 +153,14 @@ static void pdc_console_poll(unsigned long unused)
         if (count)
                 tty_flip_buffer_push(tty);
 
+        tty_kref_put(tty);
+
         if (pdc_cons.flags & CON_ENABLED)
                 mod_timer(&pdc_console_timer, jiffies + PDC_CONS_POLL_DELAY);
 }
 
+static struct tty_driver *pdc_console_tty_driver;
+
 static int __init pdc_console_tty_driver_init(void)
 {
         int err;
@@ -182,6 +185,8 @@ static int __init pdc_console_tty_driver_init(void)
         printk(KERN_INFO "The PDC console driver is still registered, removing CON_BOOT flag\n");
         pdc_cons.flags &= ~CON_BOOT;
 
+        tty_port_init(&tty_port);
+
         pdc_console_tty_driver = alloc_tty_driver(1);
 
         if (!pdc_console_tty_driver)