i7core_edac: return -ENODEV if no MC is found
Nehalem-EX uses a different memory controller. However, as the
memory controller is not visible on some Nehalem/Nehalem-EP, we
need to indirectly probe via a X58 PCI device. The same devices
are found on (some) Nehalem-EX. So, on those machines, the
probe routine needs to return -ENODEV, as the actual Memory
Controller registers won't be detected.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/edac/i7core_edac.c b/drivers/edac/i7core_edac.c
index 304f550..6ae7795 100644
--- a/drivers/edac/i7core_edac.c
+++ b/drivers/edac/i7core_edac.c
@@ -2226,7 +2226,7 @@
static int __devinit i7core_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
- int rc;
+ int rc, count = 0;
struct i7core_dev *i7core_dev;
/* get the pci devices we want to reserve for our use */
@@ -2246,12 +2246,28 @@
goto fail0;
list_for_each_entry(i7core_dev, &i7core_edac_list, list) {
+ count++;
rc = i7core_register_mci(i7core_dev);
if (unlikely(rc < 0))
goto fail1;
}
- i7core_printk(KERN_INFO, "Driver loaded.\n");
+ /*
+ * Nehalem-EX uses a different memory controller. However, as the
+ * memory controller is not visible on some Nehalem/Nehalem-EP, we
+ * need to indirectly probe via a X58 PCI device. The same devices
+ * are found on (some) Nehalem-EX. So, on those machines, the
+ * probe routine needs to return -ENODEV, as the actual Memory
+ * Controller registers won't be detected.
+ */
+ if (!count) {
+ rc = -ENODEV;
+ goto fail1;
+ }
+
+ i7core_printk(KERN_INFO,
+ "Driver loaded, %d memory controller(s) found.\n",
+ count);
mutex_unlock(&i7core_edac_lock);
return 0;
