drivers/of: Return allocated memory from of_fdt_unflatten_tree()
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>steinar/wifi_calib_4_9_kernel
parent
c4263233f3
commit
83262418b0
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@ -454,11 +454,14 @@ static int unflatten_dt_nodes(const void *blob,
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* @mynodes: The device_node tree created by the call
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* @mynodes: The device_node tree created by the call
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* @dt_alloc: An allocator that provides a virtual address to memory
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* @dt_alloc: An allocator that provides a virtual address to memory
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* for the resulting tree
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* for the resulting tree
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*
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* Returns NULL on failure or the memory chunk containing the unflattened
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* device tree on success.
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*/
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*/
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static void __unflatten_device_tree(const void *blob,
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static void *__unflatten_device_tree(const void *blob,
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struct device_node *dad,
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struct device_node *dad,
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struct device_node **mynodes,
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struct device_node **mynodes,
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void * (*dt_alloc)(u64 size, u64 align))
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void *(*dt_alloc)(u64 size, u64 align))
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{
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{
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int size;
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int size;
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void *mem;
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void *mem;
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@ -467,7 +470,7 @@ static void __unflatten_device_tree(const void *blob,
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if (!blob) {
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if (!blob) {
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pr_debug("No device tree pointer\n");
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pr_debug("No device tree pointer\n");
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return;
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return NULL;
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}
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}
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pr_debug("Unflattening device tree:\n");
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pr_debug("Unflattening device tree:\n");
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@ -477,13 +480,13 @@ static void __unflatten_device_tree(const void *blob,
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if (fdt_check_header(blob)) {
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if (fdt_check_header(blob)) {
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pr_err("Invalid device tree blob header\n");
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pr_err("Invalid device tree blob header\n");
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return;
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return NULL;
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}
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}
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/* First pass, scan for size */
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/* First pass, scan for size */
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size = unflatten_dt_nodes(blob, NULL, dad, NULL);
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size = unflatten_dt_nodes(blob, NULL, dad, NULL);
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if (size < 0)
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if (size < 0)
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return;
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return NULL;
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size = ALIGN(size, 4);
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size = ALIGN(size, 4);
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pr_debug(" size is %d, allocating...\n", size);
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pr_debug(" size is %d, allocating...\n", size);
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@ -503,6 +506,7 @@ static void __unflatten_device_tree(const void *blob,
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be32_to_cpup(mem + size));
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be32_to_cpup(mem + size));
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pr_debug(" <- unflatten_device_tree()\n");
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pr_debug(" <- unflatten_device_tree()\n");
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return mem;
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}
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}
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static void *kernel_tree_alloc(u64 size, u64 align)
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static void *kernel_tree_alloc(u64 size, u64 align)
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@ -522,14 +526,21 @@ static DEFINE_MUTEX(of_fdt_unflatten_mutex);
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* tree of struct device_node. It also fills the "name" and "type"
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* tree of struct device_node. It also fills the "name" and "type"
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* pointers of the nodes so the normal device-tree walking functions
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* pointers of the nodes so the normal device-tree walking functions
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* can be used.
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* can be used.
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*
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* Returns NULL on failure or the memory chunk containing the unflattened
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* device tree on success.
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*/
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*/
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void of_fdt_unflatten_tree(const unsigned long *blob,
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void *of_fdt_unflatten_tree(const unsigned long *blob,
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struct device_node *dad,
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struct device_node *dad,
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struct device_node **mynodes)
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struct device_node **mynodes)
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{
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{
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void *mem;
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mutex_lock(&of_fdt_unflatten_mutex);
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mutex_lock(&of_fdt_unflatten_mutex);
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__unflatten_device_tree(blob, dad, mynodes, &kernel_tree_alloc);
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mem = __unflatten_device_tree(blob, dad, mynodes, &kernel_tree_alloc);
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mutex_unlock(&of_fdt_unflatten_mutex);
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mutex_unlock(&of_fdt_unflatten_mutex);
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return mem;
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}
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}
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EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree);
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EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree);
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@ -37,9 +37,9 @@ extern bool of_fdt_is_big_endian(const void *blob,
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unsigned long node);
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unsigned long node);
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extern int of_fdt_match(const void *blob, unsigned long node,
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extern int of_fdt_match(const void *blob, unsigned long node,
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const char *const *compat);
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const char *const *compat);
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extern void of_fdt_unflatten_tree(const unsigned long *blob,
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extern void *of_fdt_unflatten_tree(const unsigned long *blob,
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struct device_node *dad,
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struct device_node *dad,
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struct device_node **mynodes);
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struct device_node **mynodes);
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/* TBD: Temporary export of fdt globals - remove when code fully merged */
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/* TBD: Temporary export of fdt globals - remove when code fully merged */
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extern int __initdata dt_root_addr_cells;
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extern int __initdata dt_root_addr_cells;
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