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

Input: elan_i2c - check if device is there before really probing

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: input-elan_i2c-check-if-device-is-there-before-really-probing.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 Mon Apr 9 17:09:24 CEST 2018

From: Dmitry Torokhov dmitry.torokhov@gmail.com Date: Fri, 19 Dec 2014 12:57:49 -0800 Subject: Input: elan_i2c - check if device is there before really probing

From: Dmitry Torokhov dmitry.torokhov@gmail.com

[ Upstream commit c5928551fd41b2eecdad78fa2be2a4a13ed5fde9 ]

Before trying to properly initialize the touchpad and generate bunch of errors, let's first see it there is anything at the given address. If we get error, fail silently with -ENXIO.

Reviewed-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Dmitry Torokhov dmitry.torokhov@gmail.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/input/mouse/elan_i2c_core.c | 7 +++++++ 1 file changed, 7 insertions(+)

--- a/drivers/input/mouse/elan_i2c_core.c +++ b/drivers/input/mouse/elan_i2c_core.c @@ -1082,6 +1082,13 @@ static int elan_probe(struct i2c_client return error; }

+ /* Make sure there is something at this address */ + error = i2c_smbus_read_byte(client); + if (error < 0) { + dev_dbg(&client->dev, "nothing at this address: %d\n", error); + return -ENXIO; + } + /* Initialize the touchpad. */ error = elan_initialize(data); if (error)

Patches currently in stable-queue which might be from dmitry.torokhov@gmail.com are

queue-4.9/input-elantech-force-relative-mode-on-a-certain-module.patch queue-4.9/input-elan_i2c-check-if-device-is-there-before-really-probing.patch queue-4.9/input-goodix-disable-irqs-while-suspended.patch queue-4.9/input-elan_i2c-clear-int-before-resetting-controller.patch