Merge tag 'driver-core-4.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core updates from Greg KH:
 "Just a few patches this time around for the 4.6-rc1 merge window.
  Largest is a new firmware driver, but there are some other updates to
  the driver core in here as well, the shortlog has the details.

  All have been in linux-next for a while with no reported issues"

* tag 'driver-core-4.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
  Revert "driver-core: platform: probe of-devices only using list of compatibles"
  firmware: qemu config needs I/O ports
  firmware: qemu_fw_cfg.c: fix typo FW_CFG_DATA_OFF
  driver-core: platform: probe of-devices only using list of compatibles
  driver-core: platform: fix typo in documentation for multi-driver helper
  component: remove impossible condition
  drivers: dma-coherent: simplify dma_init_coherent_memory return value
  devicetree: update documentation for fw_cfg ARM bindings
  firmware: create directory hierarchy for sysfs fw_cfg entries
  firmware: introduce sysfs driver for QEMU's fw_cfg device
  kobject: export kset_find_obj() for module use
  driver core: bus: use to_subsys_private and to_device_private_bus
  driver core: bus: use list_for_each_entry*
  debugfs: Add stub function for debugfs_create_automount().
  kernfs: make kernfs_walk_ns() use kernfs_pr_cont_buf[]

drivers/base/bus.c

@@ -149,8 +149,7 @@ EXPORT_SYMBOL_GPL(bus_remove_file);
 
 static void bus_release(struct kobject *kobj)
 {
-	struct subsys_private *priv =
-		container_of(kobj, typeof(*priv), subsys.kobj);
+	struct subsys_private *priv = to_subsys_private(kobj);
 	struct bus_type *bus = priv->bus;
 
 	kfree(priv);
@@ -1019,13 +1018,11 @@ static void device_insertion_sort_klist(struct device *a, struct list_head *list
 					int (*compare)(const struct device *a,
 							const struct device *b))
 {
-	struct list_head *pos;
 	struct klist_node *n;
 	struct device_private *dev_prv;
 	struct device *b;
 
-	list_for_each(pos, list) {
-		n = container_of(pos, struct klist_node, n_node);
+	list_for_each_entry(n, list, n_node) {
 		dev_prv = to_device_private_bus(n);
 		b = dev_prv->device;
 		if (compare(a, b) <= 0) {
@@ -1042,8 +1039,7 @@ void bus_sort_breadthfirst(struct bus_type *bus,
 					  const struct device *b))
 {
 	LIST_HEAD(sorted_devices);
-	struct list_head *pos, *tmp;
-	struct klist_node *n;
+	struct klist_node *n, *tmp;
 	struct device_private *dev_prv;
 	struct device *dev;
 	struct klist *device_klist;
@@ -1051,8 +1047,7 @@ void bus_sort_breadthfirst(struct bus_type *bus,
 	device_klist = bus_get_device_klist(bus);
 
 	spin_lock(&device_klist->k_lock);
-	list_for_each_safe(pos, tmp, &device_klist->k_list) {
-		n = container_of(pos, struct klist_node, n_node);
+	list_for_each_entry_safe(n, tmp, &device_klist->k_list, n_node) {
 		dev_prv = to_device_private_bus(n);
 		dev = dev_prv->device;
 		device_insertion_sort_klist(dev, &sorted_devices, compare);
@@ -1107,7 +1102,7 @@ struct device *subsys_dev_iter_next(struct subsys_dev_iter *iter)
 		knode = klist_next(&iter->ki);
 		if (!knode)
 			return NULL;
-		dev = container_of(knode, struct device_private, knode_bus)->device;
+		dev = to_device_private_bus(knode)->device;
 		if (!iter->type || iter->type == dev->type)
 			return dev;
 	}

drivers/base/component.c

@@ -267,7 +267,7 @@ void component_match_add_release(struct device *master,
 	}
 
 	if (match->num == match->alloc) {
-		size_t new_size = match ? match->alloc + 16 : 15;
+		size_t new_size = match->alloc + 16;
 		int ret;
 
 		ret = component_match_realloc(master, match, new_size);

drivers/base/dma-coherent.c

@@ -17,9 +17,9 @@ struct dma_coherent_mem {
 	spinlock_t	spinlock;
 };
 
-static int dma_init_coherent_memory(phys_addr_t phys_addr, dma_addr_t device_addr,
-			     size_t size, int flags,
-			     struct dma_coherent_mem **mem)
+static bool dma_init_coherent_memory(
+	phys_addr_t phys_addr, dma_addr_t device_addr, size_t size, int flags,
+	struct dma_coherent_mem **mem)
 {
 	struct dma_coherent_mem *dma_mem = NULL;
 	void __iomem *mem_base = NULL;
@@ -50,17 +50,13 @@ static int dma_init_coherent_memory(phys_addr_t phys_addr, dma_addr_t device_add
 	spin_lock_init(&dma_mem->spinlock);
 
 	*mem = dma_mem;
-
-	if (flags & DMA_MEMORY_MAP)
-		return DMA_MEMORY_MAP;
-
-	return DMA_MEMORY_IO;
+	return true;
 
 out:
 	kfree(dma_mem);
 	if (mem_base)
 		iounmap(mem_base);
-	return 0;
+	return false;
 }
 
 static void dma_release_coherent_memory(struct dma_coherent_mem *mem)
@@ -88,15 +84,13 @@ int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
 				dma_addr_t device_addr, size_t size, int flags)
 {
 	struct dma_coherent_mem *mem;
-	int ret;
 
-	ret = dma_init_coherent_memory(phys_addr, device_addr, size, flags,
-				       &mem);
-	if (ret == 0)
+	if (!dma_init_coherent_memory(phys_addr, device_addr, size, flags,
+				      &mem))
 		return 0;
 
 	if (dma_assign_coherent_memory(dev, mem) == 0)
-		return ret;
+		return flags & DMA_MEMORY_MAP ? DMA_MEMORY_MAP : DMA_MEMORY_IO;
 
 	dma_release_coherent_memory(mem);
 	return 0;
@@ -281,9 +275,9 @@ static int rmem_dma_device_init(struct reserved_mem *rmem, struct device *dev)
 	struct dma_coherent_mem *mem = rmem->priv;
 
 	if (!mem &&
-	    dma_init_coherent_memory(rmem->base, rmem->base, rmem->size,
-				     DMA_MEMORY_MAP | DMA_MEMORY_EXCLUSIVE,
-				     &mem) != DMA_MEMORY_MAP) {
+	    !dma_init_coherent_memory(rmem->base, rmem->base, rmem->size,
+				      DMA_MEMORY_MAP | DMA_MEMORY_EXCLUSIVE,
+				      &mem)) {
 		pr_err("Reserved memory: failed to init DMA memory pool at %pa, size %ld MiB\n",
 			&rmem->base, (unsigned long)rmem->size / SZ_1M);
 		return -ENODEV;