[ACPI] [PATCH 1/2] make acpi_path_name() global

[Randy D. <ran...@li...>]

From: Randy Dunlap <ran...@li...>

Make acpi_path_name() usable by everyone.
I need this for adding SATA suspend/resume ACPI support.

Note:
This function is now a memory allocator and callers should kfree()
the memory when done with it.  It doesn't seem safe to me to leave
it as returning a pointer to a static buffer (as it was in multiple
cloned copies) as we add callers to it.


Signed-off-by: Randy Dunlap <ran...@li...>
---
 drivers/acpi/osl.c      |   29 +++++++++++++++++++++++++++++
 include/acpi/acpiosxf.h |    2 ++
 2 files changed, 31 insertions(+)

--- linux-2615-rc5g5.orig/drivers/acpi/osl.c
+++ linux-2615-rc5g5/drivers/acpi/osl.c
@@ -1078,6 +1078,35 @@ void acpi_os_release_lock(acpi_handle ha
 	spin_unlock_irqrestore((spinlock_t *) handle, flags);
 }
 
+/**
+ * acpi_path_name - get ACPI path_name for the given handle
+ * @handle: ACPI object handle to look up name of
+ *
+ * Allocates memory if successul.  Caller must free the memory.
+ *
+ * Returns: pointer to path_name if successful, NULL if not.
+ */
+u8 *acpi_path_name(acpi_handle handle)
+{
+	acpi_status		status;
+	static u8		*path_name;
+	struct acpi_buffer	ret_buf = {ACPI_PATHNAME_MAX, path_name};
+
+	path_name = kzalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
+	if (!path_name)
+		return NULL;
+
+	status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &ret_buf);
+
+	if (ACPI_FAILURE(status)) {
+		acpi_os_free(path_name);
+		return NULL;
+	}
+
+	return path_name;
+}
+EXPORT_SYMBOL(acpi_path_name);
+
 #ifndef ACPI_USE_LOCAL_CACHE
 
 /*******************************************************************************
--- linux-2615-rc5g5.orig/include/acpi/acpiosxf.h
+++ linux-2615-rc5g5/include/acpi/acpiosxf.h
@@ -112,6 +112,8 @@ unsigned long acpi_os_acquire_lock(acpi_
 
 void acpi_os_release_lock(acpi_handle handle, unsigned long flags);
 
+u8 *acpi_path_name(acpi_handle handle);
+
 /*
  * Memory allocation and mapping
  */


---