ACPI: Fix a warning of discarding qualifiers from pointer target type

drivers/acpi/ec.c: In function `acpi_ec_ecdt_probe':
drivers/acpi/ec.c:873: warning: passing arg 1 of `acpi_get_devices' discards qualifiers from pointer target type

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Len Brown <len.brown@intel.com>

3 files changed, 3 insertions, 3 deletions

diff --git a/drivers/acpi/namespace/nsxfeval.c b/drivers/acpi/namespace/nsxfeval.c
index ab65b2c2560e..f39fbc6b9237 100644
--- a/drivers/acpi/namespace/nsxfeval.c
+++ b/drivers/acpi/namespace/nsxfeval.c
@@ -540,7 +540,7 @@ acpi_ns_get_device_callback(acpi_handle obj_handle,
  ******************************************************************************/
 
 acpi_status
-acpi_get_devices(char *HID,
+acpi_get_devices(const char *HID,
                  acpi_walk_callback user_function,
                  void *context, void **return_value)
 {
diff --git a/include/acpi/acpixf.h b/include/acpi/acpixf.h
index b5cca5daa348..3d7ab9e0c9fe 100644
--- a/include/acpi/acpixf.h
+++ b/include/acpi/acpixf.h
@@ -130,7 +130,7 @@ acpi_walk_namespace(acpi_object_type type,
                     void *context, void **return_value);
 
 acpi_status
-acpi_get_devices(char *HID,
+acpi_get_devices(const char *HID,
                  acpi_walk_callback user_function,
                  void *context, void **return_value);
 
diff --git a/include/acpi/acstruct.h b/include/acpi/acstruct.h
index aeb4498e5e06..88482655407f 100644
--- a/include/acpi/acstruct.h
+++ b/include/acpi/acstruct.h
@@ -146,7 +146,7 @@ struct acpi_init_walk_info {
 struct acpi_get_devices_info {
         acpi_walk_callback user_function;
         void *context;
-        char *hid;
+        const char *hid;
 };
 
 union acpi_aml_operands {