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

serial: 8250_dw: Disable clock on error

to the 4.9-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-8250_dw-disable-clock-on-error.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 foo@baz Thu Mar 22 14:40:24 CET 2018

From: Stefan Potyra Stefan.Potyra@elektrobit.com Date: Wed, 6 Dec 2017 16:46:12 +0100 Subject: serial: 8250_dw: Disable clock on error

From: Stefan Potyra Stefan.Potyra@elektrobit.com

[ Upstream commit 8af016aa5a27c6a2505460eb4d83f1e70c38dc43 ]

If there is no clock rate for uartclk defined, disable the previously enabled clock again.

Found by Linux Driver Verification project (linuxtesting.org).

Fixes: 23f5b3fdd04e serial: 8250_dw: only get the clock rate in one place Signed-off-by: Stefan Potyra Stefan.Potyra@elektrobit.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/tty/serial/8250/8250_dw.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/tty/serial/8250/8250_dw.c +++ b/drivers/tty/serial/8250/8250_dw.c @@ -464,7 +464,8 @@ static int dw8250_probe(struct platform_ /* If no clock rate is defined, fail. */ if (!p->uartclk) { dev_err(dev, "clock rate not defined\n"); - return -EINVAL; + err = -EINVAL; + goto err_clk; }

data->pclk = devm_clk_get(dev, "apb_pclk");

Patches currently in stable-queue which might be from Stefan.Potyra@elektrobit.com are

queue-4.9/serial-8250_dw-disable-clock-on-error.patch