From mboxrd@z Thu Jan 1 00:00:00 1970 From: gregkh@linuxfoundation.org (Greg Kroah-Hartman) Date: Thu, 15 Sep 2016 12:33:28 +0200 Subject: [PATCH] BUG: atmel_serial: Interrupts not disabled on close In-Reply-To: References: <20160912133441.14597-1-richard.genoud@gmail.com> Message-ID: <20160915103328.GA23118@kroah.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Mon, Sep 12, 2016 at 05:22:58PM +0200, Nicolas Ferre wrote: > Le 12/09/2016 ? 15:34, Richard Genoud a ?crit : > > 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 at 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 > > Fixes: 18dfef9c7f87 ("serial: atmel: convert to irq handling provided mctrl-gpio") > > I thinks it's a bit late for "4.8-fixes". > > Greg, tell me if you want that I add the Cc: stable tag to this patch > (as advised by Uwe) and re-send? I'll add it, no worries. greg k-h