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

i2c: i801: Fix Failed to allocate irq -2147483648 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: i2c-i801-fix-failed-to-allocate-irq-2147483648-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 6e0c9507bf51e1517a80ad0ac171e5402528fcef Mon Sep 17 00:00:00 2001

From: Hans de Goede hdegoede@redhat.com Date: Wed, 22 Nov 2017 12:28:17 +0100 Subject: i2c: i801: Fix Failed to allocate irq -2147483648 error

From: Hans de Goede hdegoede@redhat.com

commit 6e0c9507bf51e1517a80ad0ac171e5402528fcef upstream.

On Apollo Lake devices the BIOS does not set up IRQ routing for the i801 SMBUS controller IRQ, so we end up with dev->irq set to IRQ_NOTCONNECTED.

Detect this and do not try to use the irq in this case silencing: i801_smbus 0000:00:1f.1: Failed to allocate irq -2147483648: -107

BugLink: https://communities.intel.com/thread/114759 Signed-off-by: Hans de Goede hdegoede@redhat.com Reviewed-by: Jean Delvare jdelvare@suse.de Signed-off-by: Wolfram Sang wsa@the-dreams.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- drivers/i2c/busses/i2c-i801.c | 3 +++ 1 file changed, 3 insertions(+)

--- a/drivers/i2c/busses/i2c-i801.c +++ b/drivers/i2c/busses/i2c-i801.c @@ -1592,6 +1592,9 @@ static int i801_probe(struct pci_dev *de /* Default timeout in interrupt mode: 200 ms */ priv->adapter.timeout = HZ / 5;

+ if (dev->irq == IRQ_NOTCONNECTED) + priv->features &= ~FEATURE_IRQ; + if (priv->features & FEATURE_IRQ) { u16 pcictl, pcists;

Patches currently in stable-queue which might be from hdegoede@redhat.com are

queue-4.9/i2c-i801-fix-failed-to-allocate-irq-2147483648-error.patch