From: Douglas Anderson <dianders@chromium.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
rafael.j.wysocki@intel.com, Andy Gross <agross@kernel.org>,
Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: mka@chromium.org, swboyd@chromium.org, mkshah@codeaurora.org,
evgreen@chromium.org, Douglas Anderson <dianders@chromium.org>,
Alexios Zavras <alexios.zavras@intel.com>,
Allison Randal <allison@lohutok.net>,
Colin Cross <ccross@android.com>, Kevin Hilman <khilman@ti.com>,
Santosh Shilimkar <santosh.shilimkar@ti.com>,
Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org
Subject: [PATCH v4 3/5] kernel/cpu_pm: Fix uninitted local in cpu_pm
Date: Wed, 22 Apr 2020 14:55:01 -0700 [thread overview]
Message-ID: <20200422145408.v4.3.I2d44fc0053d019f239527a4e5829416714b7e299@changeid> (raw)
In-Reply-To: <20200422145408.v4.1.Ic7096b3b9b7828cdd41cd5469a6dee5eb6abf549@changeid>
cpu_pm_notify() is basically a wrapper of notifier_call_chain().
notifier_call_chain() doesn't initialize *nr_calls to 0 before it
starts incrementing it--presumably it's up to the callers to do this.
Unfortunately the callers of cpu_pm_notify() don't init *nr_calls.
This potentially means you could get too many or two few calls to
CPU_PM_ENTER_FAILED or CPU_CLUSTER_PM_ENTER_FAILED depending on the
luck of the stack.
Let's fix this.
Fixes: ab10023e0088 ("cpu_pm: Add cpu power management notifiers")
Signed-off-by: Douglas Anderson <dianders@chromium.org>
---
Changes in v4: None
Changes in v3: None
Changes in v2:
- ("Fix uninitted local in cpu_pm") new for v2.
kernel/cpu_pm.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/cpu_pm.c b/kernel/cpu_pm.c
index cbca6879ab7d..44a259338e33 100644
--- a/kernel/cpu_pm.c
+++ b/kernel/cpu_pm.c
@@ -80,7 +80,7 @@ EXPORT_SYMBOL_GPL(cpu_pm_unregister_notifier);
*/
int cpu_pm_enter(void)
{
- int nr_calls;
+ int nr_calls = 0;
int ret = 0;
ret = cpu_pm_notify(CPU_PM_ENTER, -1, &nr_calls);
@@ -131,7 +131,7 @@ EXPORT_SYMBOL_GPL(cpu_pm_exit);
*/
int cpu_cluster_pm_enter(void)
{
- int nr_calls;
+ int nr_calls = 0;
int ret = 0;
ret = cpu_pm_notify(CPU_CLUSTER_PM_ENTER, -1, &nr_calls);
--
2.26.1.301.g55bc3eb7cb9-goog
next prev parent reply other threads:[~2020-04-22 21:55 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-22 21:54 [PATCH v4 1/5] soc: qcom: rpmh-rsc: Corrently ignore CPU_CLUSTER_PM notifications Douglas Anderson
2020-04-22 21:55 ` [PATCH v4 2/5] soc: qcom: rpmh-rsc: We aren't notified of our own failure w/ NOTIFY_BAD Douglas Anderson
2020-04-23 4:48 ` Maulik Shah
2020-04-24 2:38 ` Stephen Boyd
2020-04-24 2:41 ` Stephen Boyd
2020-04-22 21:55 ` Douglas Anderson [this message]
2020-04-24 2:43 ` [PATCH v4 3/5] kernel/cpu_pm: Fix uninitted local in cpu_pm Stephen Boyd
2020-04-22 21:55 ` [PATCH v4 4/5] soc: qcom: rpmh-rsc: Simplify locking by eliminating the per-TCS lock Douglas Anderson
2020-04-24 2:48 ` Stephen Boyd
2020-04-24 16:47 ` Doug Anderson
2020-04-22 21:55 ` [PATCH v4 5/5] soc: qcom: rpmh-rsc: Remove the pm_lock Douglas Anderson
2020-04-24 3:59 ` Stephen Boyd
2020-04-23 4:45 ` [PATCH v4 1/5] soc: qcom: rpmh-rsc: Corrently ignore CPU_CLUSTER_PM notifications Maulik Shah
2020-04-23 16:19 ` Doug Anderson
2020-04-24 2:38 ` Stephen Boyd
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