On Mon, Sep 12, 2016 at 03:34:41PM +0200, Richard Genoud wrote:
> 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.)
AFAIK this is no reason to not put stable on Cc. If then
$stablemaintainer fails to backport the change, he will contact you.
> Signed-off-by: Richard Genoud <richard.genoud@xxxxxxxxx>
> Fixes: 18dfef9c7f87 ("serial: atmel: convert to irq handling provided mctrl-gpio")
Acked-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Thanks for caring
Uwe
--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | http://www.pengutronix.de/ |
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