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: [PATCH] i2c: i801: Fix Failed to allocate irq -2147483648 error
Git-commit: 6e0c9507bf51e1517a80ad0ac171e5402528fcef
Patch-mainline: v4.15-rc2
References: bsc#1051510

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

Cc: stable@vger.kernel.org
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>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 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
@@ -1613,6 +1613,9 @@ 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;