MIPS: PCI: Use struct list_head lists

Rather than open-coding a linked list implementation, make use of the
one in linux/list.h.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14340/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/include/asm/pci.h

@@ -17,6 +17,7 @@
  */
 
 #include <linux/ioport.h>
+#include <linux/list.h>
 #include <linux/of.h>
 
 /*
@@ -25,7 +26,7 @@
  * single controller supporting multiple channels.
  */
 struct pci_controller {
-	struct pci_controller *next;
+	struct list_head list;
 	struct pci_bus *bus;
 	struct device_node *of_node;
 

arch/mips/pci/pci.c

@@ -28,8 +28,7 @@
 /*
  * The PCI controller list.
  */
-
-static struct pci_controller *hose_head, **hose_tail = &hose_head;
+static LIST_HEAD(controllers);
 
 unsigned long PCIBIOS_MIN_IO;
 unsigned long PCIBIOS_MIN_MEM;
@@ -193,8 +192,8 @@ void register_pci_controller(struct pci_controller *hose)
 		goto out;
 	}
 
-	*hose_tail = hose;
-	hose_tail = &hose->next;
+	INIT_LIST_HEAD(&hose->list);
+	list_add(&hose->list, &controllers);
 
 	/*
 	 * Do not panic here but later - this might happen before console init.
@@ -248,7 +247,7 @@ static int __init pcibios_init(void)
 	pcibios_set_cache_line_size();
 
 	/* Scan all of the recorded PCI controllers.  */
-	for (hose = hose_head; hose; hose = hose->next)
+	list_for_each_entry(hose, &controllers, list)
 		pcibios_scanbus(hose);
 
 	pci_fixup_irqs(pci_common_swizzle, pcibios_map_irq);