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 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: serial-omap-fix-efr-write-on-rts-deassertion.patch and it can be found in the queue-4.4 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-4.4/serial-omap-fix-efr-write-on-rts-deassertion.patch