ACPI: processor: idle: Allow probing on platforms with one ACPI C-state (496121c0) · Commits · 戴 / test

It is possible for ACPI _CST to return only one ACPI C-state, for example, when deep cstate disabled in the BIOS. And it is better for the acpi_idle driver to probe succesfully in this case as well for consistency. Signed-off-by:

Zhang Rui <rui.zhang@intel.com> Signed-off-by:

Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/processor_idle.c

+2 −7

Original line number	Diff line number	Diff line
		@@ -308,11 +308,7 @@ static int acpi_processor_get_power_info_cst(struct acpi_processor *pr)
		if (ret)
		return ret;

		/*
		* It is expected that there will be at least 2 states, C1 and
		* something else (C2 or C3), so fail if that is not the case.
		*/
		if (pr->power.count < 2)
		if (!pr->power.count)
		return -EFAULT;

		pr->flags.has_cst = 1;
		@@ -468,7 +464,6 @@ static int acpi_processor_get_cstate_info(struct acpi_processor *pr)
		for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
		if (pr->power.states[i].valid) {
		pr->power.count = i;
		if (pr->power.states[i].type >= ACPI_STATE_C2)
		pr->flags.power = 1;
		}
		}

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