Patch "serial: core: fix crash in uart_suspend_port" has been added to the 4.11-stable tree

This is a note to let you know that I've just added the patch titled

serial: core: fix crash in uart_suspend_port

to the 4.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
serial-core-fix-crash-in-uart_suspend_port.patch
and it can be found in the queue-4.11 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Lucas Stach <[email protected]>
Date: Thu, 11 May 2017 12:56:14 +0200
Subject: serial: core: fix crash in uart_suspend_port

From: Lucas Stach <[email protected]>

commit 88e2582e90bb89fe895ff0dceeb5d5ab65d07997 upstream.

With serdev we might end up with serial ports that have no cdev exported to userspace, as they are used as the bus interface to other devices. In that case serial_match_port() won't be able to find a matching tty_dev.

Skip the irq wakeup enabling in that case, as serdev will make sure to keep the port active, as long as there are devices depending on it.

---
 drivers/tty/serial/serial_core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -2083,7 +2083,7 @@ int uart_suspend_port(struct uart_driver
 	mutex_lock(&port->mutex);
 
 	tty_dev = device_find_child(uport->dev, &match, serial_match_port);
-	if (device_may_wakeup(tty_dev)) {
+	if (tty_dev && device_may_wakeup(tty_dev)) {
 		if (!enable_irq_wake(uport->irq))
 			uport->irq_wake = 1;
 		put_device(tty_dev);

Patches currently in stable-queue which might be from [email protected] are

queue-4.11/serial-core-fix-crash-in-uart_suspend_port.patch