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  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:   Mon, 18 Feb 2019 20:29:14 +0100
From:   Niklas Cassel <niklas.cassel@...aro.org>
To:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>
Cc:     Niklas Cassel <niklas.cassel@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] regulator: core: Drop lockdep annotation in drms_uA_update()

commit e5e21f70bfd3 ("regulator: core: Take lock before applying system
load") took the regulator lock before calling drms_uA_update() in order
to silence a lockdep warning during regulator_register().

However, we are not supposed to need locks at this point as the regulator
is in the process of being registered, so there should be no possibility
of concurrent access.

Instead, remove the unnecessary locking and simply drop the lockdep
annotation, since it is no longer valid.

Fixes: e5e21f70bfd3 ("regulator: core: Take lock before applying system load")
Signed-off-by: Niklas Cassel <niklas.cassel@...aro.org>
---
 drivers/regulator/core.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 7ed134afb316..c6c280163c05 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -922,8 +922,6 @@ static int drms_uA_update(struct regulator_dev *rdev)
 	int current_uA = 0, output_uV, input_uV, err;
 	unsigned int mode;
 
-	lockdep_assert_held_once(&rdev->mutex.base);
-
 	/*
 	 * first check to see if we can set modes at all, otherwise just
 	 * tell the consumer everything is OK.
@@ -1347,9 +1345,7 @@ static int set_machine_constraints(struct regulator_dev *rdev,
 		 * We'll only apply the initial system load if an
 		 * initial mode wasn't specified.
 		 */
-		regulator_lock(rdev);
 		drms_uA_update(rdev);
-		regulator_unlock(rdev);
 	}
 
 	if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable)
-- 
2.20.1

Powered by blists - more mailing lists