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authorLinas Vepstas <linas@linas.org>2005-11-03 18:49:38 -0600
committerPaul Mackerras <paulus@samba.org>2005-11-10 11:35:27 +1100
commit18126f35f69c928af26ec1dda2cb91b23220cdd4 (patch)
tree1717427df79d309dd5bcdba24b2e8c741785b03f /arch
parent5c1344e988c716470b5609708215dd7f135f0e3a (diff)
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[PATCH] ppc64: bugfix: crash on PCI hotplug
09-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 __init __alloc_bootmem() was called long after boot had finished, resulting in a crash because this routine is undefined after boot time. The patch below fixes this crash, and adds some docs to clarify the code. Signed-off-by: Linas Vepstas <linas@austin.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/ppc64/kernel/pci_dn.c21
1 files changed, 17 insertions, 4 deletions
diff --git a/arch/ppc64/kernel/pci_dn.c b/arch/ppc64/kernel/pci_dn.c
index 1a443a7..12c4c9e 100644
--- a/arch/ppc64/kernel/pci_dn.c
+++ b/arch/ppc64/kernel/pci_dn.c
@@ -43,7 +43,7 @@ static void * __devinit update_dn_pci_info(struct device_node *dn, void *data)
u32 *regs;
struct pci_dn *pdn;
- if (phb->is_dynamic)
+ if (mem_init_done)
pdn = kmalloc(sizeof(*pdn), GFP_KERNEL);
else
pdn = alloc_bootmem(sizeof(*pdn));
@@ -120,6 +120,14 @@ void *traverse_pci_devices(struct device_node *start, traverse_func pre,
return NULL;
}
+/**
+ * pci_devs_phb_init_dynamic - setup pci devices under this PHB
+ * phb: pci-to-host bridge (top-level bridge connecting to cpu)
+ *
+ * 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;
@@ -201,9 +209,14 @@ static struct notifier_block pci_dn_reconfig_nb = {
.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.
+ *
+ * This routine walks over all phb's (pci-host bridges) on the
+ * system, and sets up assorted pci-related structures
+ * (including pci info in the device node structs) for each
+ * pci device found underneath. This routine runs once,
+ * early in the boot sequence.
*/
void __init pci_devs_phb_init(void)
{