Avoid printing extraneous warning messages when trying to switch a device

which doesn't support ACPI power states.  Return AE_NOT_FOUND for these
cases and don't print the warning message.  Also, print the name of the
handle instead of device when unable to switch states.  The device is often
not attached at this point and so its name is NULL, which doesn't help
debugging.

1 files changed, 11 insertions, 8 deletions

diff --git a/sys/dev/acpica/acpi_powerres.c b/sys/dev/acpica/acpi_powerres.c
index 73c20f2..943a0bf 100644
--- a/sys/dev/acpica/acpi_powerres.c
+++ b/sys/dev/acpica/acpi_powerres.c
@@ -326,7 +326,7 @@ acpi_pwr_switch_consumer(ACPI_HANDLE consumer, int state)
 	return_ACPI_STATUS (AE_BAD_PARAMETER);	/* can only go to D0 from D3 */
 
     /* Find transition mechanism(s) */
-    switch(state) {
+    switch (state) {
     case ACPI_STATE_D0:
 	method_name = "_PS0";
 	reslist_name = "_PR0";
@@ -359,6 +359,7 @@ acpi_pwr_switch_consumer(ACPI_HANDLE consumer, int state)
      * support D0 and D3.  It's never an error to try to go to
      * D0.
      */
+    status = AE_BAD_PARAMETER;
     reslist_buffer.Pointer = NULL;
     reslist_object = NULL;
     if (ACPI_FAILURE(AcpiGetHandle(consumer, method_name, &method_handle)))
@@ -373,19 +374,22 @@ acpi_pwr_switch_consumer(ACPI_HANDLE consumer, int state)
 	if (state != ACPI_STATE_D3)
 	    goto bad;
 
-	/* Turn off the resources listed in _PR0 to go to D3. */
-	if (ACPI_FAILURE(AcpiGetHandle(consumer, "_PR0", &pr0_handle)))
+	/*
+	 * Turn off the resources listed in _PR0 to go to D3.  If there is
+	 * no _PR0 method, this object doesn't support ACPI power states.
+	 */
+	if (ACPI_FAILURE(AcpiGetHandle(consumer, "_PR0", &pr0_handle))) {
+	    status = AE_NOT_FOUND;
 	    goto bad;
+	}
 	reslist_buffer.Length = ACPI_ALLOCATE_BUFFER;
 	status = AcpiEvaluateObject(pr0_handle, NULL, NULL, &reslist_buffer);
 	if (ACPI_FAILURE(status))
 	    goto bad;
 	reslist_object = (ACPI_OBJECT *)reslist_buffer.Pointer;
 	if (reslist_object->Type != ACPI_TYPE_PACKAGE ||
-	    reslist_object->Package.Count == 0) {
-
+	    reslist_object->Package.Count == 0)
 	    goto bad;
-	}
 	AcpiOsFree(reslist_buffer.Pointer);
 	reslist_buffer.Pointer = NULL;
 	reslist_object = NULL;
@@ -419,7 +423,7 @@ acpi_pwr_switch_consumer(ACPI_HANDLE consumer, int state)
      * resource references.
      */
     res_changed = 0;
-    while((pr = TAILQ_FIRST(&pc->ac_references)) != NULL) {
+    while ((pr = TAILQ_FIRST(&pc->ac_references)) != NULL) {
 	res_changed = 1;
 	ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "removing reference to %s\n",
 			 acpi_name(pr->ar_resource->ap_resource)));
@@ -477,7 +481,6 @@ acpi_pwr_switch_consumer(ACPI_HANDLE consumer, int state)
  bad:
     ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
 		     "attempt to set unsupported state D%d\n", state));
-    status = AE_BAD_PARAMETER;
 
  out:
     if (reslist_buffer.Pointer != NULL)