[PATCH 4.9 23/38] i2c: i801: Fix Failed to allocate irq -2147483648 error

Greg Kroah-Hartman
2017-12-04T16:33:35Z

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;