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-rw-r--r--drivers/edac/pnd2_edac.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/edac/pnd2_edac.c b/drivers/edac/pnd2_edac.c
index 2b16b95201eb..89cdd9a7a733 100644
--- a/drivers/edac/pnd2_edac.c
+++ b/drivers/edac/pnd2_edac.c
@@ -236,12 +236,23 @@ static u64 get_sideband_reg_base_addr(void)
{
struct pci_dev *pdev;
u32 hi, lo;
+ u8 hidden;
pdev = pci_get_device(PCI_VENDOR_ID_INTEL, 0x19dd, NULL);
if (pdev) {
+ /* Unhide the P2SB device, if it's hidden */
+ pci_read_config_byte(pdev, 0xe1, &hidden);
+ if (hidden)
+ pci_write_config_byte(pdev, 0xe1, 0);
+
pci_read_config_dword(pdev, 0x10, &lo);
pci_read_config_dword(pdev, 0x14, &hi);
lo &= 0xfffffff0;
+
+ /* Hide the P2SB device, if it was hidden before */
+ if (hidden)
+ pci_write_config_byte(pdev, 0xe1, hidden);
+
pci_dev_put(pdev);
return (U64_LSHIFT(hi, 32) | U64_LSHIFT(lo, 0));
} else {

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