linux-kernel - [PATCH 4.19 209/239] regulator: core: Let boot-on regulators be powered off

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

Message-Id: <20220124183949.754390300@linuxfoundation.org>
Date:   Mon, 24 Jan 2022 19:44:07 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Pascal Paillet <p.paillet@...com>,
        Mark Brown <broonie@...nel.org>, Andre Kalb <andre.kalb@....de>
Subject: [PATCH 4.19 209/239] regulator: core: Let boot-on regulators be powered off

From: Pascal Paillet <p.paillet@...com>

commit 089b3f61ecfc43ca4ea26d595e1d31ead6de3f7b upstream.

Boot-on regulators are always kept on because their use_count value
is now incremented at boot time and never cleaned.

Only increment count value for alway-on regulators.
regulator_late_cleanup() is now able to power off boot-on regulators
when unused.

Fixes: 05f224ca6693 ("regulator: core: Clean enabling always-on regulators + their supplies")
Signed-off-by: Pascal Paillet <p.paillet@...com>
Link: https://lore.kernel.org/r/20191113102737.27831-1-p.paillet@st.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Acked-by: Andre Kalb <andre.kalb@....de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/regulator/core.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1211,7 +1211,9 @@ static int set_machine_constraints(struc
 			rdev_err(rdev, "failed to enable\n");
 			return ret;
 		}
-		rdev->use_count++;
+
+		if (rdev->constraints->always_on)
+			rdev->use_count++;
 	}
 
 	print_constraints(rdev);