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Date: Wed, 20 Oct 2021 21:10:17 +0200 From: "Rafael J. Wysocki" <rjw@...ysocki.net> To: Linux ACPI <linux-acpi@...r.kernel.org> Cc: LKML <linux-kernel@...r.kernel.org>, Linux PM <linux-pm@...r.kernel.org> Subject: [PATCH] ACPI: PM: sleep: Do not set suspend_ops unnecessarily From: Rafael J. Wysocki <rafael.j.wysocki@...el.com> If none of the S1 - S3 sleep states is supported, it is not necessary to register suspend_ops, so don't do that then. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com> --- drivers/acpi/sleep.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) Index: linux-pm/drivers/acpi/sleep.c =================================================================== --- linux-pm.orig/drivers/acpi/sleep.c +++ linux-pm/drivers/acpi/sleep.c @@ -815,14 +815,18 @@ void __weak acpi_s2idle_setup(void) static void acpi_sleep_suspend_setup(void) { + bool suspend_ops_needed = false; int i; for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) - if (acpi_sleep_state_supported(i)) + if (acpi_sleep_state_supported(i)) { sleep_states[i] = 1; + suspend_ops_needed = true; + } - suspend_set_ops(old_suspend_ordering ? - &acpi_suspend_ops_old : &acpi_suspend_ops); + if (suspend_ops_needed) + suspend_set_ops(old_suspend_ordering ? + &acpi_suspend_ops_old : &acpi_suspend_ops); acpi_s2idle_setup(); }
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