diff options
| author | Tomas Winkler <tomas.winkler@intel.com> | 2012-08-06 15:23:55 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-08-16 09:40:28 -0700 |
| commit | 9a123f19832702753805afe0e93db26799b91b07 (patch) | |
| tree | ef70961cad7389f2ea2bddf89dc11d507effe90a | |
| parent | 07b509b7943e5594f3f228e5b62a49cf6a033709 (diff) | |
mei: add mei_quirk_probe function
The main purpose of this function is to exclude ME devices
without support for MEI/HECI interface from binding
Currently affected systems are C600/X79 based servers
that expose PCI device even though it doesn't supported ME Interface.
MEI driver accessing such nonfunctional device can corrupt
the system.
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/misc/mei/main.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c index b0903bd44bf7..86b73e596263 100644 --- a/drivers/misc/mei/main.c +++ b/drivers/misc/mei/main.c @@ -906,6 +906,27 @@ static struct miscdevice mei_misc_device = { }; /** + * mei_quirk_probe - probe for devices that doesn't valid ME interface + * @pdev: PCI device structure + * @ent: entry into pci_device_table + * + * returns true if ME Interface is valid, false otherwise + */ +static bool __devinit mei_quirk_probe(struct pci_dev *pdev, + const struct pci_device_id *ent) +{ + u32 reg; + if (ent->device == MEI_DEV_ID_PBG_1) { + pci_read_config_dword(pdev, 0x48, ®); + /* make sure that bit 9 is up and bit 10 is down */ + if ((reg & 0x600) == 0x200) { + dev_info(&pdev->dev, "Device doesn't have valid ME Interface\n"); + return false; + } + } + return true; +} +/** * mei_probe - Device Initialization Routine * * @pdev: PCI device structure @@ -920,6 +941,12 @@ static int __devinit mei_probe(struct pci_dev *pdev, int err; mutex_lock(&mei_mutex); + + if (!mei_quirk_probe(pdev, ent)) { + err = -ENODEV; + goto end; + } + if (mei_device) { err = -EEXIST; goto end; |