[SERIAL] Fix Bug 4900: S3 resume oops with irattach - Thinkpad A21m

If we fail to re-startup a serial port on resume, shut it down
immediately and mark it as an error condition.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

drivers/serial/serial_core.c

@@ -209,8 +209,14 @@ static void uart_shutdown(struct uart_state *state)
 	struct uart_info *info = state->info;
 	struct uart_port *port = state->port;
 
-	if (!(info->flags & UIF_INITIALIZED))
-		return;
+	/*
+	 * Set the TTY IO error marker
+	 */
+	if (info->tty)
+		set_bit(TTY_IO_ERROR, &info->tty->flags);
+
+	if (info->flags & UIF_INITIALIZED) {
+		info->flags &= ~UIF_INITIALIZED;
 
 		/*
 		 * Turn off DTR and RTS early.
@@ -236,6 +242,12 @@ static void uart_shutdown(struct uart_state *state)
 		 * Ensure that the IRQ handler isn't running on another CPU.
 		 */
 		synchronize_irq(port->irq);
+	}
+
+	/*
+	 * kill off our tasklet
+	 */
+	tasklet_kill(&info->tlet);
 
 	/*
 	 * Free the transmit buffer page.
@@ -244,15 +256,6 @@ static void uart_shutdown(struct uart_state *state)
 		free_page((unsigned long)info->xmit.buf);
 		info->xmit.buf = NULL;
 	}
-
-	/*
-	 * kill off our tasklet
-	 */
-	tasklet_kill(&info->tlet);
-	if (info->tty)
-		set_bit(TTY_IO_ERROR, &info->tty->flags);
-
-	info->flags &= ~UIF_INITIALIZED;
 }
 
 /**
@@ -1928,14 +1931,25 @@ int uart_resume_port(struct uart_driver *drv, struct uart_port *port)
 
 	if (state->info && state->info->flags & UIF_INITIALIZED) {
 		struct uart_ops *ops = port->ops;
+		int ret;
 
 		ops->set_mctrl(port, 0);
-		ops->startup(port);
+		ret = ops->startup(port);
+		if (ret == 0) {
 			uart_change_speed(state, NULL);
 			spin_lock_irq(&port->lock);
 			ops->set_mctrl(port, port->mctrl);
 			ops->start_tx(port);
 			spin_unlock_irq(&port->lock);
+		} else {
+			/*
+			 * Failed to resume - maybe hardware went away?
+			 * Clear the "initialized" flag so we won't try
+			 * to call the low level drivers shutdown method.
+			 */
+			state->info->flags &= ~UIF_INITIALIZED;
+			uart_shutdown(state);
+		}
 	}
 
 	up(&state->sem);