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ipmi:pci: Blacklist a Realtek "IPMI" device

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commit bc48fa1b9d3b04106055b27078da824cd209865a upstream.

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.

[ 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. ]

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: Paul Menzel <pmenzel@molgen.mpg.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Corey Minyard 2018-02-15 16:58:26 -06:00 committed by Greg Kroah-Hartman
parent 53818c7644
commit de616eb216
1 changed files with 12 additions and 0 deletions
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12
drivers/char/ipmi/ipmi_si_intf.c
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@ -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;