tty/serial: lay the foundations for the next set of reworks
- Stop drivers calling their own flush method indirectly, it obfuscates code
and it will change soon anyway
- A few more lock_kernel paths temporarily needed in some driver internal
waiting code
- Remove private put_char method that does a write call for one char - we
have that anyway
- Most but not yet all of the termios copy under lock fixing (some has other
dependencies to follow)
- Note a few locking bugs in drivers found in the process
- Kill remaining [ab]users of TIOCG/SSOFTCAR in the driver, these must go to
fix the termios locking
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/char/specialix.c b/drivers/char/specialix.c
index 9f9a4bd..075ad92 100644
--- a/drivers/char/specialix.c
+++ b/drivers/char/specialix.c
@@ -1504,6 +1504,27 @@
return 0;
}
+static void sx_flush_buffer(struct tty_struct *tty)
+{
+ struct specialix_port *port = (struct specialix_port *)tty->driver_data;
+ unsigned long flags;
+ struct specialix_board * bp;
+
+ func_enter();
+
+ if (sx_paranoia_check(port, tty->name, "sx_flush_buffer")) {
+ func_exit();
+ return;
+ }
+
+ bp = port_Board(port);
+ spin_lock_irqsave(&port->lock, flags);
+ port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
+ spin_unlock_irqrestore(&port->lock, flags);
+ tty_wakeup(tty);
+
+ func_exit();
+}
static void sx_close(struct tty_struct * tty, struct file * filp)
{
@@ -1597,8 +1618,7 @@
}
sx_shutdown_port(bp, port);
- if (tty->driver->flush_buffer)
- tty->driver->flush_buffer(tty);
+ sx_flush_buffer(tty);
tty_ldisc_flush(tty);
spin_lock_irqsave(&port->lock, flags);
tty->closing = 0;
@@ -1770,28 +1790,6 @@
}
-static void sx_flush_buffer(struct tty_struct *tty)
-{
- struct specialix_port *port = (struct specialix_port *)tty->driver_data;
- unsigned long flags;
- struct specialix_board * bp;
-
- func_enter();
-
- if (sx_paranoia_check(port, tty->name, "sx_flush_buffer")) {
- func_exit();
- return;
- }
-
- bp = port_Board(port);
- spin_lock_irqsave(&port->lock, flags);
- port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
- spin_unlock_irqrestore(&port->lock, flags);
- tty_wakeup(tty);
-
- func_exit();
-}
-
static int sx_tiocmget(struct tty_struct *tty, struct file *file)
{