From: Corey Minyard <cminyard@mvista.com>
Date: Thu, 15 Feb 2018 16:58:26 -0600
Subject: ipmi:pci: Blacklist a Realtek "IPMI" device
Git-commit: bc48fa1b9d3b04106055b27078da824cd209865a
Patch-mainline: v4.17-rc1
References: git-fixes

Realtek has some sort of "Virtual" IPMI device on the PCI bus as a
KCS controller, but whatever it is, it's not one.  Ignore it if seen.

Reported-by: Chris Chiu <chiu@endlessm.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Tested-by: Daniel Drake <drake@endlessm.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 drivers/char/ipmi/ipmi_si_intf.c |   12 ++++++++++++
 1 file changed, 12 insertions(+)

--- a/drivers/char/ipmi/ipmi_si_intf.c
+++ b/drivers/char/ipmi/ipmi_si_intf.c
@@ -2447,6 +2447,15 @@ static int ipmi_pci_probe_regspacing(str
 	return DEFAULT_REGSPACING;
 }
 
+static struct pci_device_id ipmi_pci_blacklist[] = {
+	/*
+	 * This is a "Virtual IPMI device", whatever that is.  It appears
+	 * as a KCS device by the class, but it is not one.
+	 */
+	{ PCI_VDEVICE(REALTEK, 0x816c) },
+	{ 0, }
+};
+
 static int ipmi_pci_probe(struct pci_dev *pdev,
 				    const struct pci_device_id *ent)
 {
@@ -2454,6 +2463,9 @@ static int ipmi_pci_probe(struct pci_dev
 	int class_type = pdev->class & PCI_ERMC_CLASSCODE_TYPE_MASK;
 	struct smi_info *info;
 
+	if (pci_match_id(ipmi_pci_blacklist, pdev))
+		return -ENODEV;
+
 	info = smi_info_alloc();
 	if (!info)
 		return -ENOMEM;