[PATCH] ppc64: Crash in DLPAR code on PCI hotplug add

[linas]

08-hotplug-bugfix.patch

In the current 2.6.14-rc2-git6 kernel, performing a Dynamic LPAR Add 
of a hotplug slot will crash the system, with the following (abbreviated) 
stack trace:

cpu 0x3: Vector: 700 (Program Check) at [c000000053dff7f0]
    pc: c0000000004f5974: .__alloc_bootmem+0x0/0xb0
    lr: c0000000000258a0: .update_dn_pci_info+0x108/0x118
        c0000000000257c8 .update_dn_pci_info+0x30/0x118 (unreliable)
        c0000000000258fc .pci_dn_reconfig_notifier+0x4c/0x64
        c000000000060754 .notifier_call_chain+0x68/0x9c

The root cause was that the phb was not marked "dynamic", and so instead
of having kmalloc() being called, the __init __alloc_bootmem() was called,
resulting in access of garage data.  The patch below fixes this crash,
and adds some docs to clarify the code.

Signed-off-by: Linas Vepstas <linas at linas.org>


Index: linux-2.6.14-rc2-git6/arch/ppc64/kernel/pci_dn.c
===================================================================
--- linux-2.6.14-rc2-git6.orig/arch/ppc64/kernel/pci_dn.c	2005-10-03 13:45:58.011393833 -0500
+++ linux-2.6.14-rc2-git6/arch/ppc64/kernel/pci_dn.c	2005-10-03 13:52:26.421786761 -0500
@@ -121,6 +121,12 @@
 	return NULL;
 }
 
+/** pci_devs_phb_init_dynamic -- setup pci devices under this PHB
+ *
+ * This routine is called both during boot, (before the memory
+ * subsystem is set up, before kmalloc is valid) and during the 
+ * dynamic lpar operation of adding a PHB to a running system.
+ */
 void __devinit pci_devs_phb_init_dynamic(struct pci_controller *phb)
 {
 	struct device_node * dn = (struct device_node *) phb->arch_data;
@@ -201,17 +207,19 @@
 	.notifier_call = pci_dn_reconfig_notifier,
 };
 
-/*
- * Actually initialize the phbs.
- * The buswalk on this phb has not happened yet.
+/** pci_devs_phb_init -- Initialize phbs and pci devs under them.
+ * 
+ * When this is called, the buswalk of PHB's has not happened yet.
  */
 void __init pci_devs_phb_init(void)
 {
 	struct pci_controller *phb, *tmp;
 
 	/* This must be done first so the device nodes have valid pci info! */
-	list_for_each_entry_safe(phb, tmp, &hose_list, list_node)
+	list_for_each_entry_safe(phb, tmp, &hose_list, list_node) {
 		pci_devs_phb_init_dynamic(phb);
+		phb->is_dynamic = 1;
+	}
 
 	pSeries_reconfig_notifier_register(&pci_dn_reconfig_nb);
 }