linux-kernel - [PATCH v1 1/3] ACPI: OSL: Use spin locks without disabling interrupts

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Message-ID: <1895035.tdWV9SEqCh@kreacher>
Date: Fri, 15 Dec 2023 12:25:15 +0100
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Linux ACPI <linux-acpi@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>, Zhang Rui <rui.zhang@...el.com>, Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>, Michal Wilczynski <michal.wilczynski@...el.com>, Hans de Goede <hdegoede@...hat.com>, Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, Mika Westerberg <mika.westerberg@...ux.intel.com>, Heikki Krogerus <heikki.krogerus@...ux.intel.com>, Mario Limonciello <mario.limonciello@....com>, Daniel Drake <drake@...lessm.com>
Subject: [PATCH v1 1/3] ACPI: OSL: Use spin locks without disabling interrupts

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

After commit 7a36b901a6eb ("ACPI: OSL: Use a threaded interrupt handler
for SCI") any ACPICA code never runs in a hardirq handler, so it need
not dissable interrupts on the local CPU when acquiring a spin lock.

Make it use spin locks without disabling interrupts.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/acpi/osl.c |   10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

Index: linux-pm/drivers/acpi/osl.c
===================================================================
--- linux-pm.orig/drivers/acpi/osl.c
+++ linux-pm/drivers/acpi/osl.c
@@ -1515,20 +1515,18 @@ void acpi_os_delete_lock(acpi_spinlock h
 acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
 	__acquires(lockp)
 {
-	acpi_cpu_flags flags;
-
-	spin_lock_irqsave(lockp, flags);
-	return flags;
+	spin_lock(lockp);
+	return 0;
 }

 /*
  * Release a spinlock. See above.
  */

-void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
+void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags not_used)
 	__releases(lockp)
 {
-	spin_unlock_irqrestore(lockp, flags);
+	spin_unlock(lockp);
 }

 #ifndef ACPI_USE_LOCAL_CACHE