From 22e6bcbdcf9279321dbe646c5a234b816db12881 Mon Sep 17 00:00:00 2001
From: Mauro Carvalho Chehab <mchehab@redhat.com>
Date: Sat, 5 Sep 2009 23:06:50 -0300
Subject: i7core_edac: change remove module strategy

The old remove module stragegy didn't work on devices with multiple
cores, since only one PCI device is used to open all mc's, due to
Nehalem nature.

Also, it were based at pdev value. However, this doesn't point to the
pci device used at mci->dev.

So, instead, it unregisters all devices at once, deleting them from the
device list.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/edac/i7core_edac.c b/drivers/edac/i7core_edac.c
index 391348b..c3fec5d 100644
--- a/drivers/edac/i7core_edac.c
+++ b/drivers/edac/i7core_edac.c
@@ -1138,11 +1138,18 @@ static void i7core_put_devices(struct i7core_dev *i7core_dev)
 {
 	int i;
 
-	for (i = 0; i < N_DEVS; i++)
-		pci_dev_put(i7core_dev->pdev[i]);
-
-	list_del(&i7core_dev->list);
+	debugf0(__FILE__ ": %s()\n", __func__);
+	for (i = 0; i < N_DEVS; i++) {
+		struct pci_dev *pdev = i7core_dev->pdev[i];
+		if (!pdev)
+			continue;
+		debugf0("Removing dev %02x:%02x.%d\n",
+			pdev->bus->number,
+			PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn));
+		pci_dev_put(pdev);
+	}
 	kfree(i7core_dev->pdev);
+	list_del(&i7core_dev->list);
 	kfree(i7core_dev);
 }
 
@@ -1863,31 +1870,39 @@ fail0:
 static void __devexit i7core_remove(struct pci_dev *pdev)
 {
 	struct mem_ctl_info *mci;
-	struct i7core_pvt *pvt;
-	struct i7core_dev *i7core_dev;
+	struct i7core_dev *i7core_dev, *tmp;
 
 	debugf0(__FILE__ ": %s()\n", __func__);
 
 	if (i7core_pci)
 		edac_pci_release_generic_ctl(i7core_pci);
 
+	/*
+	 * we have a trouble here: pdev value for removal will be wrong, since
+	 * it will point to the X58 register used to detect that the machine
+	 * is a Nehalem or upper design. However, due to the way several PCI
+	 * devices are grouped together to provide MC functionality, we need
+	 * to use a different method for releasing the devices
+	 */
 
-	mci = edac_mc_del_mc(&pdev->dev);
-	if (!mci)
-		return;
-
-	/* Unregisters on edac_mce in order to receive memory errors */
-	pvt = mci->pvt_info;
-	i7core_dev = pvt->i7core_dev;
-	edac_mce_unregister(&pvt->edac_mce);
-
-	/* retrieve references to resources, and free those resources */
 	mutex_lock(&i7core_edac_lock);
-	i7core_put_devices(i7core_dev);
+	list_for_each_entry_safe(i7core_dev, tmp, &i7core_edac_list, list) {
+		mci = edac_mc_del_mc(&i7core_dev->pdev[0]->dev);
+		if (mci) {
+			struct i7core_pvt *pvt = mci->pvt_info;
+
+			i7core_dev = pvt->i7core_dev;
+			edac_mce_unregister(&pvt->edac_mce);
+			kfree(mci->ctl_name);
+			edac_mc_free(mci);
+			i7core_put_devices(i7core_dev);
+		} else {
+			i7core_printk(KERN_ERR,
+				      "Couldn't find mci for socket %d\n",
+				      i7core_dev->socket);
+		}
+	}
 	mutex_unlock(&i7core_edac_lock);
-
-	kfree(mci->ctl_name);
-	edac_mc_free(mci);
 }
 
 MODULE_DEVICE_TABLE(pci, i7core_pci_tbl);
-- 
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