Make pci_claim_resource() use request_resource() rather than insert_resource()

This function has traditionally used "insert_resource()", because before
commit cebd78a8c5 ("Fix pci_claim_resource") it used to just insert the
resource into whatever root resource tree that was indicated by
"pcibios_select_root()".

So there Matthew fixed it to actually look up the proper parent
resource, which means that now it's actively wrong to then traverse the
resource tree any more: we already know exactly where the new resource
should go.

And when we then did commit a76117dfd6 ("x86: Use pci_claim_resource"),
which changed the x86 PCI code from the open-coded

	pr = pci_find_parent_resource(dev, r);
	if (!pr || request_resource(pr, r) < 0) {

to using

	if (pci_claim_resource(dev, idx) < 0) {

that "insert_resource()" now suddenly became a problem, and causes a
regression covered by

	http://bugzilla.kernel.org/show_bug.cgi?id=13891

which this fixes.

Reported-and-tested-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Matthew Wilcox <willy@linux.intel.com>
Cc: Andrew Patterson <andrew.patterson@hp.com>
Cc: Linux PCI <linux-pci@vger.kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
index b711fb7..1898c7b 100644 (file)
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -100,16 +100,16 @@ int pci_claim_resource(struct pci_dev *dev, int resource)
 {
        struct resource *res = &dev->resource[resource];
        struct resource *root;
-       char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";
        int err;
 
        root = pci_find_parent_resource(dev, res);
 
        err = -EINVAL;
        if (root != NULL)
-               err = insert_resource(root, res);
+               err = request_resource(root, res);
 
        if (err) {
+               const char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";
                dev_err(&dev->dev, "BAR %d: %s of %s %pR\n",
                        resource,
                        root ? "address space collision on" :