ACPI: Export acpi_(bay)|(dock)_match() from scan.c

Functions acpi_dock_match() and acpi_bay_match() in scan.c can be
shared with dock.c to reduce code duplication, so export them as
global functions.

Also add a new function acpi_ata_match() to check whether an ACPI
device object represents an ATA device.

[rjw: Changelog]
Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 36 insertions, 41 deletions

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 4c25c3b7ef81..62e2055e8806 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1480,43 +1480,45 @@ static void acpi_device_get_busid(struct acpi_device *device)
 }
 
 /*
+ * acpi_ata_match - see if an acpi object is an ATA device
+ *
+ * If an acpi object has one of the ACPI ATA methods defined,
+ * then we can safely call it an ATA device.
+ */
+bool acpi_ata_match(acpi_handle handle)
+{
+        return acpi_has_method(handle, "_GTF") ||
+               acpi_has_method(handle, "_GTM") ||
+               acpi_has_method(handle, "_STM") ||
+               acpi_has_method(handle, "_SDD");
+}
+
+/*
  * acpi_bay_match - see if an acpi object is an ejectable driver bay
  *
  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
  * then we can safely call it an ejectable drive bay
  */
-static int acpi_bay_match(acpi_handle handle)
+bool acpi_bay_match(acpi_handle handle)
 {
         acpi_handle phandle;
 
         if (!acpi_has_method(handle, "_EJ0"))
-                return -ENODEV;
+                return false;
+        if (acpi_ata_match(handle))
+                return true;
+        if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
+                return false;
 
-        if (acpi_has_method(handle, "_GTF") ||
-            acpi_has_method(handle, "_GTM") ||
-            acpi_has_method(handle, "_STM") ||
-            acpi_has_method(handle, "_SDD"))
-                return 0;
-
-        if (acpi_get_parent(handle, &phandle))
-                return -ENODEV;
-
-        if (acpi_has_method(phandle, "_GTF") ||
-            acpi_has_method(phandle, "_GTM") ||
-            acpi_has_method(phandle, "_STM") ||
-            acpi_has_method(phandle, "_SDD"))
-                return 0;
-
-        return -ENODEV;
+        return acpi_ata_match(phandle);
 }
 
 /*
  * acpi_dock_match - see if an acpi object has a _DCK method
  */
-static int acpi_dock_match(acpi_handle handle)
+bool acpi_dock_match(acpi_handle handle)
 {
-        acpi_handle tmp;
-        return acpi_get_handle(handle, "_DCK", &tmp);
+        return acpi_has_method(handle, "_DCK");
 }
 
 const char *acpi_device_hid(struct acpi_device *device)
@@ -1554,33 +1556,26 @@ static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
  * prefix.  Work around this.
  */
-static int acpi_ibm_smbus_match(acpi_handle handle)
+static bool acpi_ibm_smbus_match(acpi_handle handle)
 {
-        struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
-        int result;
+        char node_name[ACPI_PATH_SEGMENT_LENGTH];
+        struct acpi_buffer path = { sizeof(node_name), node_name };
 
         if (!dmi_name_in_vendors("IBM"))
-                return -ENODEV;
+                return false;
 
         /* Look for SMBS object */
-        result = acpi_get_name(handle, ACPI_SINGLE_NAME, &path);
-        if (result)
-                return result;
-
-        if (strcmp("SMBS", path.pointer)) {
-                result = -ENODEV;
-                goto out;
-        }
+        if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
+            strcmp("SMBS", path.pointer))
+                return false;
 
         /* Does it have the necessary (but misnamed) methods? */
-        result = -ENODEV;
         if (acpi_has_method(handle, "SBI") &&
             acpi_has_method(handle, "SBR") &&
             acpi_has_method(handle, "SBW"))
-                result = 0;
-out:
-        kfree(path.pointer);
-        return result;
+                return true;
+
+        return false;
 }
 
 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
@@ -1628,11 +1623,11 @@ static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
                  */
                 if (acpi_is_video_device(handle))
                         acpi_add_id(pnp, ACPI_VIDEO_HID);
-                else if (ACPI_SUCCESS(acpi_bay_match(handle)))
+                else if (acpi_bay_match(handle))
                         acpi_add_id(pnp, ACPI_BAY_HID);
-                else if (ACPI_SUCCESS(acpi_dock_match(handle)))
+                else if (acpi_dock_match(handle))
                         acpi_add_id(pnp, ACPI_DOCK_HID);
-                else if (!acpi_ibm_smbus_match(handle))
+                else if (acpi_ibm_smbus_match(handle))
                         acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
                 else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) {
                         acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */