linux-kernel - [PATCH 5.13 105/127] opp: Drop empty-table checks from

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: <20210824165607.709387-106-sashal@kernel.org>
Date:   Tue, 24 Aug 2021 12:55:45 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Dmitry Osipenko <digetx@...il.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.13 105/127] opp: Drop empty-table checks from _put functions

From: Dmitry Osipenko <digetx@...il.com>

[ Upstream commit c3ddfe66d2bb511f7fbcdc8e64952c7859e7e69d ]

The current_opp is released only when whole OPP table is released,
otherwise it's only marked as removed by dev_pm_opp_remove_table().
Functions like dev_pm_opp_put_clkname() and dev_pm_opp_put_supported_hw()
are checking whether OPP table is empty and it's not if current_opp is
set since it holds the refcount of OPP, this produces a noisy warning
from these functions about busy OPP table. Remove the checks to fix it.

Cc: stable@...r.kernel.org
Fixes: 81c4d8a3c414 ("opp: Keep track of currently programmed OPP")
Signed-off-by: Dmitry Osipenko <digetx@...il.com>
Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/opp/core.c | 15 ---------------
 1 file changed, 15 deletions(-)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index e366218d6736..4c23b5736c77 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -1846,9 +1846,6 @@ void dev_pm_opp_put_supported_hw(struct opp_table *opp_table)
 	if (unlikely(!opp_table))
 		return;
 
-	/* Make sure there are no concurrent readers while updating opp_table */
-	WARN_ON(!list_empty(&opp_table->opp_list));
-
 	kfree(opp_table->supported_hw);
 	opp_table->supported_hw = NULL;
 	opp_table->supported_hw_count = 0;
@@ -1934,9 +1931,6 @@ void dev_pm_opp_put_prop_name(struct opp_table *opp_table)
 	if (unlikely(!opp_table))
 		return;
 
-	/* Make sure there are no concurrent readers while updating opp_table */
-	WARN_ON(!list_empty(&opp_table->opp_list));
-
 	kfree(opp_table->prop_name);
 	opp_table->prop_name = NULL;
 
@@ -2046,9 +2040,6 @@ void dev_pm_opp_put_regulators(struct opp_table *opp_table)
 	if (!opp_table->regulators)
 		goto put_opp_table;
 
-	/* Make sure there are no concurrent readers while updating opp_table */
-	WARN_ON(!list_empty(&opp_table->opp_list));
-
 	if (opp_table->enabled) {
 		for (i = opp_table->regulator_count - 1; i >= 0; i--)
 			regulator_disable(opp_table->regulators[i]);
@@ -2168,9 +2159,6 @@ void dev_pm_opp_put_clkname(struct opp_table *opp_table)
 	if (unlikely(!opp_table))
 		return;
 
-	/* Make sure there are no concurrent readers while updating opp_table */
-	WARN_ON(!list_empty(&opp_table->opp_list));
-
 	clk_put(opp_table->clk);
 	opp_table->clk = ERR_PTR(-EINVAL);
 
@@ -2269,9 +2257,6 @@ void dev_pm_opp_unregister_set_opp_helper(struct opp_table *opp_table)
 	if (unlikely(!opp_table))
 		return;
 
-	/* Make sure there are no concurrent readers while updating opp_table */
-	WARN_ON(!list_empty(&opp_table->opp_list));
-
 	opp_table->set_opp = NULL;
 
 	mutex_lock(&opp_table->lock);
-- 
2.30.2