linux-kernel - [PATCH] ACPI: PM: Print debug messages on device power state changes

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Date:   Fri, 02 Aug 2019 12:26:02 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Linux ACPI <linux-acpi@...r.kernel.org>
Cc:     Linux PM <linux-pm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: [PATCH] ACPI: PM: Print debug messages on device power state changes

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

Add an acpi_handle_debug() statement to acpi_device_set_power() to
allow ACPI device power state changes to be tracked.

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

Index: linux-pm/drivers/acpi/device_pm.c
===================================================================
--- linux-pm.orig/drivers/acpi/device_pm.c
+++ linux-pm/drivers/acpi/device_pm.c
@@ -166,6 +166,10 @@ int acpi_device_set_power(struct acpi_de
 	    || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
 		return -EINVAL;
 
+	acpi_handle_debug(device->handle, "Power state change: %s -> %s\n",
+			  acpi_power_state_string(device->power.state),
+			  acpi_power_state_string(state));
+
 	/* Make sure this is a valid target state */
 
 	/* There is a special case for D0 addressed below. */