From: Stephen Boyd <sboyd@codeaurora.org>
To: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Rafael Wysocki <rjw@rjwysocki.net>,
Viresh Kumar <vireshk@kernel.org>, Nishanth Menon <nm@ti.com>,
linaro-kernel@lists.linaro.org, linux-pm@vger.kernel.org,
linux-kernel@vger.kernel.org,
Vincent Guittot <vincent.guittot@linaro.org>
Subject: Re: [PATCH 02/12] PM / OPP: Add 'struct kref' to OPP table
Date: Mon, 9 Jan 2017 15:36:27 -0800 [thread overview]
Message-ID: <20170109233627.GU17126@codeaurora.org> (raw)
In-Reply-To: <3f23949c92492ea74a7a55cd04bcd41a37592ed5.1481106919.git.viresh.kumar@linaro.org>
On 12/07, Viresh Kumar wrote:
> @@ -894,8 +895,36 @@ static void _kfree_device_rcu(struct rcu_head *head)
> kfree_rcu(opp_table, rcu_head);
> }
>
> -static void _free_opp_table(struct opp_table *opp_table)
> +void _get_opp_table_kref(struct opp_table *opp_table)
> {
> + kref_get(&opp_table->kref);
> +}
> +
> +struct opp_table *dev_pm_opp_get_opp_table(struct device *dev)
> +{
> + struct opp_table *opp_table;
> +
> + /* Hold our table modification lock here */
> + mutex_lock(&opp_table_lock);
> +
> + opp_table = _find_opp_table(dev);
> + if (!IS_ERR(opp_table)) {
> + _get_opp_table_kref(opp_table);
It seems odd to have _get_opp_table_kref() take a pointer to
increment a kref on. It would be better to have _find_opp_table()
return the pointer with the reference already taken so that we
don't have to update callers with reference grabbing calls.
Typically if a function returns a reference counted pointer the
reference counting has already been done.
> + goto unlock;
> + }
> +
> + opp_table = _allocate_opp_table(dev);
> +
> +unlock:
> + mutex_unlock(&opp_table_lock);
> +
> + return opp_table;
> +}
> +EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_table);
> +
> +static void _opp_table_kref_release_unlocked(struct kref *kref)
> +{
> + struct opp_table *opp_table = container_of(kref, struct opp_table, kref);
> struct opp_device *opp_dev;
>
> /* Release clk */
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project
next prev parent reply other threads:[~2017-01-09 23:36 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-07 10:37 [PATCH 00/12] PM / OPP: Use kref and move away from RCU locking Viresh Kumar
2016-12-07 10:37 ` [PATCH 01/12] PM / OPP: Add per OPP table mutex Viresh Kumar
2017-01-09 23:11 ` Stephen Boyd
2016-12-07 10:37 ` [PATCH 02/12] PM / OPP: Add 'struct kref' to OPP table Viresh Kumar
2017-01-09 23:36 ` Stephen Boyd [this message]
2017-01-10 4:23 ` Viresh Kumar
2017-01-13 8:54 ` Stephen Boyd
2016-12-07 10:37 ` [PATCH 03/12] PM / OPP: Return opp_table from dev_pm_opp_set_*() routines Viresh Kumar
2017-01-09 23:37 ` Stephen Boyd
2016-12-07 10:37 ` [PATCH 04/12] PM / OPP: Take reference of the OPP table while adding/removing OPPs Viresh Kumar
2017-01-09 23:38 ` Stephen Boyd
2016-12-07 10:37 ` [PATCH 05/12] PM / OPP: Use dev_pm_opp_get_opp_table() instead of _add_opp_table() Viresh Kumar
2017-01-09 23:43 ` Stephen Boyd
2016-12-07 10:37 ` [PATCH 06/12] PM / OPP: Add 'struct kref' to struct dev_pm_opp Viresh Kumar
2017-01-09 23:44 ` Stephen Boyd
2017-01-10 4:26 ` Viresh Kumar
2017-01-13 8:52 ` Stephen Boyd
2017-01-13 8:56 ` Viresh Kumar
2017-01-19 20:01 ` Stephen Boyd
2016-12-07 10:37 ` [PATCH 07/12] PM / OPP: Update OPP users to put reference Viresh Kumar
2016-12-07 13:23 ` Chanwoo Choi
2016-12-08 4:00 ` Viresh Kumar
2017-01-21 7:42 ` Chanwoo Choi
2016-12-07 10:37 ` [PATCH 08/12] PM / OPP: Take kref from _find_opp_table() Viresh Kumar
2017-01-09 23:49 ` Stephen Boyd
2016-12-07 10:37 ` [PATCH 09/12] PM / OPP: Move away from RCU locking Viresh Kumar
2017-01-09 23:57 ` Stephen Boyd
2017-01-10 4:28 ` Viresh Kumar
2016-12-07 10:37 ` [PATCH 10/12] PM / OPP: Simplify _opp_set_availability() Viresh Kumar
2017-01-10 0:00 ` Stephen Boyd
2016-12-07 10:37 ` [PATCH 11/12] PM / OPP: Simplify dev_pm_opp_get_max_volt_latency() Viresh Kumar
2017-01-09 22:40 ` Stephen Boyd
2016-12-07 10:37 ` [PATCH 12/12] PM / OPP: Update Documentation to remove RCU specific bits Viresh Kumar
2017-01-09 22:39 ` Stephen Boyd
2017-01-10 4:39 ` Viresh Kumar
2017-01-13 8:44 ` Stephen Boyd
2016-12-07 23:14 ` [PATCH 00/12] PM / OPP: Use kref and move away from RCU locking Rafael J. Wysocki
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