[PATCH] serial core: work around sub-driver bugs

We're presently getting oopses because Bluetooth (and possibly other) drivers
are calling core functions after things have been shut down.

So rather than oopsing, let's drop a warning then take avoiding action, so the
machine survives.  Once all the sub-drivers are fixed up we can remove the
take-avoiding-action part.

Signed-off-by: Pavel Machek <pavel@suse.cz>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/serial/serial_core.c

@@ -71,6 +71,11 @@ static void uart_change_pm(struct uart_state *state, int pm_state);
 void uart_write_wakeup(struct uart_port *port)
 {
 	struct uart_info *info = port->info;
+	/*
+	 * This means you called this function _after_ the port was
+	 * closed.  No cookie for you.
+	 */
+	BUG_ON(!info);
 	tasklet_schedule(&info->tlet);
 }
 
@@ -471,14 +476,26 @@ static void uart_flush_chars(struct tty_struct *tty)
 }
 
 static int
-uart_write(struct tty_struct *tty, const unsigned char * buf, int count)
+uart_write(struct tty_struct *tty, const unsigned char *buf, int count)
 {
 	struct uart_state *state = tty->driver_data;
-	struct uart_port *port = state->port;
-	struct circ_buf *circ = &state->info->xmit;
+	struct uart_port *port;
+	struct circ_buf *circ;
 	unsigned long flags;
 	int c, ret = 0;
 
+	/*
+	 * This means you called this function _after_ the port was
+	 * closed.  No cookie for you.
+	 */
+	if (!state || !state->info) {
+		WARN_ON(1);
+		return -EL3HLT;
+	}
+
+	port = state->port;
+	circ = &state->info->xmit;
+
 	if (!circ->buf)
 		return 0;
 
@@ -521,6 +538,15 @@ static void uart_flush_buffer(struct tty_struct *tty)
 	struct uart_port *port = state->port;
 	unsigned long flags;
 
+	/*
+	 * This means you called this function _after_ the port was
+	 * closed.  No cookie for you.
+	 */
+	if (!state || !state->info) {
+		WARN_ON(1);
+		return;
+	}
+
 	DPRINTK("uart_flush_buffer(%d) called\n", tty->index);
 
 	spin_lock_irqsave(&port->lock, flags);