powerpc/pci: Check devices status property when scanning OF tree

commit 5b339bdf164d8aee394609768f7e2e4415b0252a upstream.

We ran into an issue where it looks like we're not properly ignoring a
pci device with a non-good status property when we walk the device tree
and instanciate the Linux side PCI devices.

However, the EEH init code does look for the property and disables EEH
on these devices. This leaves us in an inconsistent where we are poking
at a supposedly bad piece of hardware and RTAS will block our config
cycles because EEH isn't enabled anyway.

Signed-of-by: Sonny Rao <sonnyrao@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/arch/powerpc/kernel/pci_of_scan.c b/arch/powerpc/kernel/pci_of_scan.c
index 4aa17401657bc6cb4ec32c8134233ba62c181ff8..5c3c8c92d57cd22e692dfffc53cce213d130ab06 100644 (file)
--- a/arch/powerpc/kernel/pci_of_scan.c
+++ b/arch/powerpc/kernel/pci_of_scan.c
@@ -310,6 +310,8 @@ static void __devinit __of_scan_bus(struct device_node *node,
        /* Scan direct children */
        for_each_child_of_node(node, child) {
                pr_debug("  * %s\n", child->full_name);
+               if (!of_device_is_available(child))
+                       continue;
                reg = of_get_property(child, "reg", &reglen);
                if (reg == NULL || reglen < 20)
                        continue;