Patch "serial: of-serial: Remove device_type = "serial" registration" has been added to the 4.0-stable tree

Patch "serial: of-serial: Remove device_type = "serial" registration" has been added to the 4.0-stable tree

[gregkh]

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

    serial: of-serial: Remove device_type = "serial" registration

to the 4.0-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-of-serial-remove-device_type-serial-registration.patch
and it can be found in the queue-4.0 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 6befa9d883385c580369a2cc9e53fbf329771f6d Mon Sep 17 00:00:00 2001
From: Michal Simek <michal.simek@xilinx.com>
Date: Tue, 14 Apr 2015 12:03:09 +0200
Subject: serial: of-serial: Remove device_type = "serial" registration

From: Michal Simek <michal.simek@xilinx.com>

commit 6befa9d883385c580369a2cc9e53fbf329771f6d upstream.

Do not probe all serial drivers by of_serial.c which are using
device_type = "serial"; property. Only drivers which have valid
compatible strings listed in the driver should be probed.

When PORT_UNKNOWN is setup probe will fail anyway.

Arnd quotation about driver historical background:
"when I wrote that driver initially, the idea was that it would
get used as a stub to hook up all other serial drivers but after
that, the common code learned to create platform devices from DT"

This patch fix the problem with on the system with xilinx_uartps and
16550a where of_serial failed to register for xilinx_uartps and because
of irq_dispose_mapping() removed irq_desc. Then when xilinx_uartps was asking
for irq with request_irq() EINVAL is returned.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/tty/serial/of_serial.c |    1 -
 1 file changed, 1 deletion(-)

--- a/drivers/tty/serial/of_serial.c
+++ b/drivers/tty/serial/of_serial.c
@@ -344,7 +344,6 @@ static struct of_device_id of_platform_s
 	{ .compatible = "ibm,qpace-nwp-serial",
 		.data = (void *)PORT_NWPSERIAL, },
 #endif
-	{ .type = "serial",         .data = (void *)PORT_UNKNOWN, },
 	{ /* end of list */ },
 };
 


Patches currently in stable-queue which might be from michal.simek@xilinx.com are

queue-4.0/serial-xilinx-use-platform_get_irq-to-get-irq-description-structure.patch
queue-4.0/serial-of-serial-remove-device_type-serial-registration.patch