1 files changed, 24 insertions, 4 deletions

diff --git a/drivers/i2c/busses/i2c-nforce2.c b/drivers/i2c/busses/i2c-nforce2.c
index 3dac920e53ea..43c9f8df9509 100644
--- a/drivers/i2c/busses/i2c-nforce2.c
+++ b/drivers/i2c/busses/i2c-nforce2.c
@@ -50,6 +50,7 @@
 #include <linux/init.h>
 #include <linux/i2c.h>
 #include <linux/delay.h>
+#include <linux/dmi.h>
 #include <asm/io.h>
 
 MODULE_LICENSE("GPL");
@@ -109,6 +110,18 @@ struct nforce2_smbus {
 /* Misc definitions */
 #define MAX_TIMEOUT     100
 
+/* We disable the second SMBus channel on these boards */
+static struct dmi_system_id __devinitdata nforce2_dmi_blacklist2[] = {
+        {
+                .ident = "DFI Lanparty NF4 Expert",
+                .matches = {
+                        DMI_MATCH(DMI_BOARD_VENDOR, "DFI Corp,LTD"),
+                        DMI_MATCH(DMI_BOARD_NAME, "LP UT NF4 Expert"),
+                },
+        },
+        { }
+};
+
 static struct pci_driver nforce2_driver;
 
 static void nforce2_abort(struct i2c_adapter *adap)
@@ -367,10 +380,17 @@ static int __devinit nforce2_probe(struct pci_dev *dev, const struct pci_device_
                 smbuses[0].base = 0;    /* to have a check value */
         }
         /* SMBus adapter 2 */
-        res2 = nforce2_probe_smb(dev, 5, NFORCE_PCI_SMB2, &smbuses[1], "SMB2");
-        if (res2 < 0) {
-                dev_err(&dev->dev, "Error probing SMB2.\n");
-                smbuses[1].base = 0;    /* to have a check value */
+        if (dmi_check_system(nforce2_dmi_blacklist2)) {
+                dev_err(&dev->dev, "Disabling SMB2 for safety reasons.\n");
+                res2 = -EPERM;
+                smbuses[1].base = 0;
+        } else {
+                res2 = nforce2_probe_smb(dev, 5, NFORCE_PCI_SMB2, &smbuses[1],
+                                         "SMB2");
+                if (res2 < 0) {
+                        dev_err(&dev->dev, "Error probing SMB2.\n");
+                        smbuses[1].base = 0;    /* to have a check value */
+                }
         }
         if ((res1 < 0) && (res2 < 0)) {
                 /* we did not find even one of the SMBuses, so we give up */