From: Viresh Kumar <viresh.kumar@linaro.org>
To: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
Vincent Guittot <vincent.guittot@linaro.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J. Wysocki" <rafael@kernel.org>
Subject: Re: [PATCH 1/4] base/drivers/arch_topology: Remove useless check
Date: Tue, 30 Oct 2018 14:03:08 +0530 [thread overview]
Message-ID: <20181030083308.5znognajpwjvdxfv@vireshk-i7> (raw)
In-Reply-To: <d689e382-e4f2-0b03-03a5-2ff4a6bb88bb@linaro.org>
On 30-10-18, 08:55, Daniel Lezcano wrote:
> The workqueue is called from init_cpu_capacity_callback(). This one is
> called in the notifier callback. IOW the notification callback
> unregisters itself. But if it is not registered, it won't unregister,
> hence it won't call the workqueue and init_cpu_capacity_notifier() is
> not called.
Sorry, couldn't understand most of your reply :)
Though let me try to explain the problem I was trying to show you..
cpufreq-notifier-callback
-> init_cpu_capacity_callback()
-> free raw capacity
-> queue_work() to unregister the notifier
-> return
->init_cpu_capacity_callback() called again before work was processed.
-> If we don't check raw_capacity, we may end up using
NULL pointer, as the notifier isn't unregistered yet.
--
viresh
next prev parent reply other threads:[~2018-10-30 8:33 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-29 16:23 [PATCH 1/4] base/drivers/arch_topology: Remove useless check Daniel Lezcano
2018-10-29 16:23 ` [PATCH 2/4] base/drivers/arch_topology: Replace mutex with READ_ONCE / WRITE_ONCE Daniel Lezcano
2018-10-30 5:57 ` Viresh Kumar
2018-11-23 13:58 ` Sudeep Holla
2018-11-23 16:04 ` Daniel Lezcano
2018-11-23 16:20 ` Sudeep Holla
2018-11-23 16:54 ` Daniel Lezcano
2018-11-26 8:27 ` Juri Lelli
2018-11-26 8:39 ` Daniel Lezcano
2018-11-26 11:33 ` Mark Brown
2018-10-29 16:23 ` [PATCH 3/4] base/drivers/topology: Move instructions in the error path Daniel Lezcano
2018-10-30 6:12 ` Viresh Kumar
2018-10-30 8:32 ` Daniel Lezcano
2018-10-29 16:23 ` [PATCH 4/4] base/drivers/topology: Default dmpis-mhz if they are not set in DT Daniel Lezcano
2018-10-30 7:13 ` Viresh Kumar
2018-10-30 8:39 ` Daniel Lezcano
2018-10-30 8:45 ` Viresh Kumar
2018-10-30 8:58 ` Viresh Kumar
2018-11-21 22:12 ` Daniel Lezcano
2018-11-22 4:29 ` Viresh Kumar
2018-11-22 10:29 ` Daniel Lezcano
2018-11-22 10:31 ` Viresh Kumar
2018-11-22 10:32 ` Daniel Lezcano
2018-11-22 11:11 ` Daniel Lezcano
2018-10-30 5:50 ` [PATCH 1/4] base/drivers/arch_topology: Remove useless check Viresh Kumar
2018-10-30 7:55 ` Daniel Lezcano
2018-10-30 8:33 ` Viresh Kumar [this message]
2018-10-30 13:35 ` Daniel Lezcano
2018-10-31 4:27 ` Viresh Kumar
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