* Patch "BUG: atmel_serial: Interrupts not disabled on close" has been added to the 4.8-stable tree
@ 2016-10-20 13:29 gregkh
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From: gregkh @ 2016-10-20 13:29 UTC (permalink / raw)
To: richard.genoud, gregkh, nicolas.ferre, u.kleine-koenig
Cc: stable, stable-commits
This is a note to let you know that I've just added the patch titled
BUG: atmel_serial: Interrupts not disabled on close
to the 4.8-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:
bug-atmel_serial-interrupts-not-disabled-on-close.patch
and it can be found in the queue-4.8 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 0ae9fdefb6c37237d826d6195e27810ffcc0b6e0 Mon Sep 17 00:00:00 2001
From: Richard Genoud <richard.genoud@gmail.com>
Date: Mon, 12 Sep 2016 15:34:41 +0200
Subject: BUG: atmel_serial: Interrupts not disabled on close
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From: Richard Genoud <richard.genoud@gmail.com>
commit 0ae9fdefb6c37237d826d6195e27810ffcc0b6e0 upstream.
Since commit 18dfef9c7f87 ("serial: atmel: convert to irq handling
provided mctrl-gpio"), interrupts from GPIOs are not disabled any more
when the serial port is closed, leading to an oops when the one of the
input pin is toggled (CTS/DSR/DCD/RNG).
This is only the case if those pins are used as GPIOs, i.e. declared
like that:
usart1: serial@f8020000 {
/* CTS and DTS will be handled by GPIO */
status = "okay";
rts-gpios = <&pioB 17 GPIO_ACTIVE_LOW>;
cts-gpios = <&pioB 16 GPIO_ACTIVE_LOW>;
dtr-gpios = <&pioB 14 GPIO_ACTIVE_LOW>;
dsr-gpios = <&pioC 31 GPIO_ACTIVE_LOW>;
rng-gpios = <&pioB 12 GPIO_ACTIVE_LOW>;
dcd-gpios = <&pioB 15 GPIO_ACTIVE_LOW>;
};
That's because modem interrupts used to be freed in atmel_shutdown().
After commit 18dfef9c7f87 ("serial: atmel: convert to irq handling
provided mctrl-gpio"), this code was just removed.
Calling atmel_disable_ms() disables the interrupts and everything works
fine again.
Tested on at91sam9g35-cm
(This patch doesn't apply on -stable kernels, fixes for 4.4 and 4.7 will
be sent after this one is applied.)
Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
Fixes: 18dfef9c7f87 ("serial: atmel: convert to irq handling provided mctrl-gpio")
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/tty/serial/atmel_serial.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -1929,6 +1929,9 @@ static void atmel_shutdown(struct uart_p
{
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
+ /* Disable modem control lines interrupts */
+ atmel_disable_ms(port);
+
/* Disable interrupts at device level */
atmel_uart_writel(port, ATMEL_US_IDR, -1);
@@ -1979,8 +1982,6 @@ static void atmel_shutdown(struct uart_p
*/
free_irq(port->irq, port);
- atmel_port->ms_irq_enabled = false;
-
atmel_flush_buffer(port);
}
Patches currently in stable-queue which might be from richard.genoud@gmail.com are
queue-4.8/bug-atmel_serial-interrupts-not-disabled-on-close.patch
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2016-10-20 13:29 Patch "BUG: atmel_serial: Interrupts not disabled on close" has been added to the 4.8-stable tree gregkh
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