linux-kernel - [PATCH] ipmi:pci: Blacklist a Realtek "IPMI" device

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Message-ID: <fe18b975-a577-8b09-c1cc-488356fc60a7@molgen.mpg.de>
Date:   Wed, 23 Jan 2019 17:27:51 +0100
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     stable@...r.kernel.org
Cc:     openipmi-developer@...ts.sourceforge.net,
        LKML <linux-kernel@...r.kernel.org>, it+lkml@...gen.mpg.de
Subject: [PATCH] ipmi:pci: Blacklist a Realtek "IPMI" device

From: Corey Minyard <cminyard@...sta.com>
Date: Thu, 15 Feb 2018 16:58:26 -0600

[ upstream commit bc48fa1b9d3b04106055b27078da824cd209865a ]

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@...lessm.com>
Signed-off-by: Corey Minyard <cminyard@...sta.com>
Tested-by: Daniel Drake <drake@...lessm.com>

[ Commit 13d0b35c (ipmi_si: Move PCI setup to another file) from Linux
  4.15-rc1 has not been back ported, so the PCI code is still in
  `drivers/char/ipmi/ipmi_si_intf.c`, requiring to apply the commit
  manually.

  This fixes a 100 s boot delay on the HP EliteDesk 705 G4 MT with Linux
  4.14.94. ]

Signed-off-by: Paul Menzel <pmenzel@...gen.mpg.de>
---
 drivers/char/ipmi/ipmi_si_intf.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
index c04aa11f0e21..6d18f8090cea 100644
--- 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(struct smi_info *info)
 	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 *pdev,
 	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;
-- 
2.17.1


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