D55225.diff
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	diff --git a/sys/dev/acpica/acpi.c b/sys/dev/acpica/acpi.c
	--- a/sys/dev/acpica/acpi.c
	+++ b/sys/dev/acpica/acpi.c
	@@ -2593,6 +2593,23 @@
	{
	}

	+/*
	+ * Simple wrapper around AcpiEnterSleepStatePrep() printing diagnostic on error.
	+ */
	+static ACPI_STATUS
	+acpi_EnterSleepStatePrep(device_t acpi_dev, UINT8 SleepState)
	+{
	+ ACPI_STATUS status;
	+
	+ status = AcpiEnterSleepStatePrep(SleepState);
	+ if (ACPI_FAILURE(status))
	+ device_printf(acpi_dev,
	+ "AcpiEnterSleepStatePrep(%u) failed - %s\n",
	+ SleepState,
	+ AcpiFormatException(status));
	+ return (status);
	+}
	+
	static void
	acpi_shutdown_final(void *arg, int howto)
	{
	@@ -2606,9 +2623,9 @@
	* an AP.
	*/
	if ((howto & RB_POWEROFF) != 0) {
	- status = AcpiEnterSleepStatePrep(ACPI_STATE_S5);
	+ status = acpi_EnterSleepStatePrep(sc->acpi_dev, ACPI_STATE_S5);
	if (ACPI_FAILURE(status)) {
	- device_printf(sc->acpi_dev, "AcpiEnterSleepStatePrep failed - %s\n",
	+ device_printf(sc->acpi_dev, "Power-off preparation failed! - %s\n",
	AcpiFormatException(status));
	return;
	}
	@@ -3659,12 +3676,9 @@
	slp_state \|= ACPI_SS_DEV_SUSPEND;

	if (stype != POWER_STYPE_SUSPEND_TO_IDLE) {
	- status = AcpiEnterSleepStatePrep(acpi_sstate);
	- if (ACPI_FAILURE(status)) {
	- device_printf(sc->acpi_dev, "AcpiEnterSleepStatePrep failed - %s\n",
	- AcpiFormatException(status));
	+ status = acpi_EnterSleepStatePrep(sc->acpi_dev, acpi_sstate);
	+ if (ACPI_FAILURE(status))
	goto backout;
	- }
	slp_state \|= ACPI_SS_SLP_PREP;
	}