[PATCH v3 47/51] PCI: Claim fixed resource during remove/rescan path

[Yinghai Lu <yinghai@kernel.org>]

We need to reserve them before pci_bus_add().

During driver loading kernel will check if those reource get reserved.

On remove/rescan path, we will leave those fixed resource
not reserved, as we don't call pcibios_resource_survery() before
pci_assign_unassigned_bus_resources(), and that is intentional
for us to get new resources for rescan.
We do have example to use rescan to make device get resource
allocated.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
 drivers/pci/quirks.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index e9fd0e9..9efa983 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -324,6 +324,23 @@ static void quirk_s3_64M(struct pci_dev *dev)
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_S3,	PCI_DEVICE_ID_S3_868,		quirk_s3_64M);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_S3,	PCI_DEVICE_ID_S3_968,		quirk_s3_64M);
 
+/* for pci remove and rescan */
+static void quirk_allocate_fixed(struct pci_dev *dev)
+{
+	int i;
+	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
+		struct resource *r = &dev->resource[i];
+
+		if (r->parent ||
+		    !(r->flags & IORESOURCE_PCI_FIXED) ||
+		    !(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
+			continue;
+
+		pci_claim_resource(dev, i);
+	}
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID,	PCI_ANY_ID,	quirk_allocate_fixed);
+
 static void quirk_io(struct pci_dev *dev, int pos, unsigned size,
 		     const char *name)
 {
-- 
1.8.4.5