Patch "serial: omap: Fix EFR write on RTS deassertion" has been added to the 4.9-stable tree

Patch "serial: omap: Fix EFR write on RTS deassertion" has been added to the 4.9-stable tree

[gregkh]

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

    serial: omap: Fix EFR write on RTS deassertion

to the 4.9-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-omap-fix-efr-write-on-rts-deassertion.patch
and it can be found in the queue-4.9 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 2a71de2f7366fb1aec632116d0549ec56d6a3940 Mon Sep 17 00:00:00 2001
From: Lukas Wunner <lukas@wunner.de>
Date: Sat, 21 Oct 2017 10:50:18 +0200
Subject: serial: omap: Fix EFR write on RTS deassertion

From: Lukas Wunner <lukas@wunner.de>

commit 2a71de2f7366fb1aec632116d0549ec56d6a3940 upstream.

Commit 348f9bb31c56 ("serial: omap: Fix RTS handling") sought to enable
auto RTS upon manual RTS assertion and disable it on deassertion.
However it seems the latter was done incorrectly, it clears all bits in
the Extended Features Register *except* auto RTS.

Fixes: 348f9bb31c56 ("serial: omap: Fix RTS handling")
Cc: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -693,7 +693,7 @@ static void serial_omap_set_mctrl(struct
 	if ((mctrl & TIOCM_RTS) && (port->status & UPSTAT_AUTORTS))
 		up->efr |= UART_EFR_RTS;
 	else
-		up->efr &= UART_EFR_RTS;
+		up->efr &= ~UART_EFR_RTS;
 	serial_out(up, UART_EFR, up->efr);
 	serial_out(up, UART_LCR, lcr);
 


Patches currently in stable-queue which might be from lukas@wunner.de are

queue-4.9/serial-omap-fix-efr-write-on-rts-deassertion.patch