[RFC/PATCH] powerpc/eeh: Create PHB PEs after EEH is initialized

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

Otherwise we end up not yet having computed the right
diag data size on powernv where EEH initialization
is delayed, thus causing memory corruption later on
when calling OPAL.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---

Russell, what do you think ? The end result is that the PEs
for the PHBs are created much later. I suppose that might cause
changes of behaviour if, for example, we hit EEH while probing
before we call eeh_init() again. Hopefully we have all the
appropriate NULL checks to deal with it though...

Another option would be to break up eeh_init() between calling
the backend init, which we would unconditionally do early (ie
removing the special powernv test) and a new eeh_create_pe()'s
which would explicitely be called by the backend at the "right"
time...

Without either fix, we are currently corrupting kernel memory
when hitting EEH on a PHB PE (fences for example).

If this ends up being the right approach, then we need a CC
stable as well.

 arch/powerpc/kernel/eeh.c     |  4 ++++
 arch/powerpc/kernel/eeh_dev.c | 18 ------------------
 2 files changed, 4 insertions(+), 18 deletions(-)

diff --git a/arch/powerpc/kernel/eeh.c b/arch/powerpc/kernel/eeh.c
index 63992b2d8e15..f27eecd5ec7f 100644
--- a/arch/powerpc/kernel/eeh.c
+++ b/arch/powerpc/kernel/eeh.c
@@ -1018,6 +1018,10 @@ int eeh_init(void)
 	} else if ((ret = eeh_ops->init()))
 		return ret;
 
+	/* Initialize PHB PEs */
+	list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
+		eeh_dev_phb_init_dynamic(hose);
+
 	/* Initialize EEH event */
 	ret = eeh_event_init();
 	if (ret)
diff --git a/arch/powerpc/kernel/eeh_dev.c b/arch/powerpc/kernel/eeh_dev.c
index d6b2ca70d14d..0820b73288c0 100644
--- a/arch/powerpc/kernel/eeh_dev.c
+++ b/arch/powerpc/kernel/eeh_dev.c
@@ -83,21 +83,3 @@ void eeh_dev_phb_init_dynamic(struct pci_controller *phb)
 	/* EEH PE for PHB */
 	eeh_phb_pe_create(phb);
 }
-
-/**
- * eeh_dev_phb_init - Create EEH devices for devices included in existing PHBs
- *
- * Scan all the existing PHBs and create EEH devices for their OF
- * nodes and their children OF nodes
- */
-static int __init eeh_dev_phb_init(void)
-{
-	struct pci_controller *phb, *tmp;
-
-	list_for_each_entry_safe(phb, tmp, &hose_list, list_node)
-		eeh_dev_phb_init_dynamic(phb);
-
-	return 0;
-}
-
-core_initcall(eeh_dev_phb_init);