linux-kernel - [PATCH v1] regulator: Don't error out fixed regulator in regulator_sync

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-next>] [day] [month] [year] [list]

Message-Id: <20211021110707.20416-1-digetx@gmail.com>
Date:   Thu, 21 Oct 2021 14:07:07 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <treding@...dia.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Mark Brown <broonie@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org
Subject: [PATCH v1] regulator: Don't error out fixed regulator in regulator_sync_voltage()

Fixed regulator can't change voltage and regulator_sync_voltage() returns
-EINVAL in this case. Make regulator_sync_voltage() to succeed for a fixed
regulator.

On NVIDIA Tegra power management driver needs to sync voltage and we have
one device (Trimslice) that uses fixed regulator which is getting synced.
The syncing error isn't treated as fatal, but produces a noisy error
message. This patch silences that error.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/regulator/core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 26bee444fc70..e1324edb3f8d 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -4249,6 +4249,9 @@ int regulator_sync_voltage(struct regulator *regulator)
 	struct regulator_voltage *voltage = &regulator->voltage[PM_SUSPEND_ON];
 	int ret, min_uV, max_uV;
 
+	if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1)
+		return 0;
+
 	regulator_lock(rdev);
 
 	if (!rdev->desc->ops->set_voltage &&
-- 
2.32.0