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drivers/of: Return allocated memory from of_fdt_unflatten_tree()

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This returns the allocate memory chunk, storing the unflattened device
tree, from of_fdt_unflatten_tree() so that memory chunk can be released
on demand in PowerNV PCI hotplug driver.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Gavin Shan 2016-05-03 23:22:51 +10:00 committed by Rob Herring
parent c4263233f3
commit 83262418b0
2 changed files with 25 additions and 14 deletions
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33
drivers/of/fdt.c
View File

@ -454,11 +454,14 @@ static int unflatten_dt_nodes(const void *blob,
* @mynodes: The device_node tree created by the call
* @dt_alloc: An allocator that provides a virtual address to memory
* for the resulting tree
*
* Returns NULL on failure or the memory chunk containing the unflattened
* device tree on success.
*/
static void __unflatten_device_tree(const void *blob,
struct device_node *dad,
struct device_node **mynodes,
void * (*dt_alloc)(u64 size, u64 align))
static void *__unflatten_device_tree(const void *blob,
struct device_node *dad,
struct device_node **mynodes,
void *(*dt_alloc)(u64 size, u64 align))
{
int size;
void *mem;
@ -467,7 +470,7 @@ static void __unflatten_device_tree(const void *blob,
if (!blob) {
pr_debug("No device tree pointer\n");
return;
return NULL;
}
pr_debug("Unflattening device tree:\n");
@ -477,13 +480,13 @@ static void __unflatten_device_tree(const void *blob,
if (fdt_check_header(blob)) {
pr_err("Invalid device tree blob header\n");
return;
return NULL;
}
/* First pass, scan for size */
size = unflatten_dt_nodes(blob, NULL, dad, NULL);
if (size < 0)
return;
return NULL;
size = ALIGN(size, 4);
pr_debug(" size is %d, allocating...\n", size);
@ -503,6 +506,7 @@ static void __unflatten_device_tree(const void *blob,
be32_to_cpup(mem + size));
pr_debug(" <- unflatten_device_tree()\n");
return mem;
}
static void *kernel_tree_alloc(u64 size, u64 align)
@ -522,14 +526,21 @@ static DEFINE_MUTEX(of_fdt_unflatten_mutex);
* tree of struct device_node. It also fills the "name" and "type"
* pointers of the nodes so the normal device-tree walking functions
* can be used.
*
* Returns NULL on failure or the memory chunk containing the unflattened
* device tree on success.
*/
void of_fdt_unflatten_tree(const unsigned long *blob,
struct device_node *dad,
struct device_node **mynodes)
void *of_fdt_unflatten_tree(const unsigned long *blob,
struct device_node *dad,
struct device_node **mynodes)
{
void *mem;
mutex_lock(&of_fdt_unflatten_mutex);
__unflatten_device_tree(blob, dad, mynodes, &kernel_tree_alloc);
mem = __unflatten_device_tree(blob, dad, mynodes, &kernel_tree_alloc);
mutex_unlock(&of_fdt_unflatten_mutex);
return mem;
}
EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree);

6
include/linux/of_fdt.h
View File

@ -37,9 +37,9 @@ extern bool of_fdt_is_big_endian(const void *blob,
unsigned long node);
extern int of_fdt_match(const void *blob, unsigned long node,
const char *const *compat);
extern void of_fdt_unflatten_tree(const unsigned long *blob,
struct device_node *dad,
struct device_node **mynodes);
extern void *of_fdt_unflatten_tree(const unsigned long *blob,
struct device_node *dad,
struct device_node **mynodes);
/* TBD: Temporary export of fdt globals - remove when code fully merged */
extern int __initdata dt_root_addr_cells;