linux-kernel - [PATCH v3 1/4] clk: core: clarify the check for runtime PM

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: <20181204192440.12125-2-miquel.raynal@bootlin.com>
Date:   Tue,  4 Dec 2018 20:24:37 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Russell King <linux@...linux.org.uk>
Cc:     linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Antoine Tenart <antoine.tenart@...tlin.com>,
        Maxime Chevallier <maxime.chevallier@...tlin.com>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Nadav Haklai <nadavh@...vell.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>
Subject: [PATCH v3 1/4] clk: core: clarify the check for runtime PM

Currently, the core->dev entry is populated only if runtime PM is
enabled. Doing so prevents accessing the device structure in any
case.

Keep the same logic but instead of using the presence of core->dev as
the only condition, also check the status of
pm_runtime_enabled(). Then, we can set the core->dev pointer at any
time as long as a device structure is available.

This change will help supporting device links in the clock subsystem.

Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
---
 drivers/clk/clk.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index af011974d4ec..b799347c5fd6 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -97,7 +97,7 @@ static int clk_pm_runtime_get(struct clk_core *core)
 {
 	int ret = 0;
 
-	if (!core->dev)
+	if (!core->dev || !pm_runtime_enabled(core->dev))
 		return 0;
 
 	ret = pm_runtime_get_sync(core->dev);
@@ -106,7 +106,7 @@ static int clk_pm_runtime_get(struct clk_core *core)
 
 static void clk_pm_runtime_put(struct clk_core *core)
 {
-	if (!core->dev)
+	if (!core->dev || !pm_runtime_enabled(core->dev))
 		return;
 
 	pm_runtime_put_sync(core->dev);
@@ -226,7 +226,7 @@ static bool clk_core_is_enabled(struct clk_core *core)
 	 * taking enable spinlock, but the below check is needed if one tries
 	 * to call it from other places.
 	 */
-	if (core->dev) {
+	if (core->dev && pm_runtime_enabled(core->dev)) {
 		pm_runtime_get_noresume(core->dev);
 		if (!pm_runtime_active(core->dev)) {
 			ret = false;
@@ -236,7 +236,7 @@ static bool clk_core_is_enabled(struct clk_core *core)
 
 	ret = core->ops->is_enabled(core->hw);
 done:
-	if (core->dev)
+	if (core->dev && pm_runtime_enabled(core->dev))
 		pm_runtime_put(core->dev);
 
 	return ret;
@@ -3272,8 +3272,7 @@ struct clk *clk_register(struct device *dev, struct clk_hw *hw)
 	}
 	core->ops = hw->init->ops;
 
-	if (dev && pm_runtime_enabled(dev))
-		core->dev = dev;
+	core->dev = dev;
 	if (dev && dev->driver)
 		core->owner = dev->driver->owner;
 	core->hw = hw;
-- 
2.19.1