From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Fri, 8 Jul 2016 06:37:17 +0000 (+1000)
Subject: powerpc/powernv/pci: Check status of a PHB before using it
X-Git-Tag: v4.8-rc1~85^2~64
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=08a45b320a0ec76866acca7db2fe2647387e5c21;p=uclinux-h8%2Flinux.git

powerpc/powernv/pci: Check status of a PHB before using it

If the firmware encounters an error (internal or HW) during initialization
of a PHB, it might leave the device-node in the tree but mark it disabled
using the "status" property. We should check it.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index ed27f4cb28ca..891fc4a453df 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -3516,6 +3516,9 @@ static void __init pnv_pci_init_ioda_phb(struct device_node *np,
 	void *aux;
 	long rc;
 
+	if (!of_device_is_available(np))
+		return;
+
 	pr_info("Initializing %s PHB (%s)\n",
 		pnv_phb_names[ioda_type], of_node_full_name(np));