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Message-Id: <f5778b7bf5d30d888297c9e2fd7097901e9c47d9.1438166099.git.viresh.kumar@linaro.org>
Date: Wed, 29 Jul 2015 16:23:01 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Rafael Wysocki <rjw@...ysocki.net>, sboyd@...eaurora.org
Cc: linaro-kernel@...ts.linaro.org, linux-pm@...r.kernel.org,
rob.herring@...aro.org, arnd.bergmann@...aro.org, nm@...com,
broonie@...nel.org, mturquette@...libre.com, Sudeep.Holla@....com,
viswanath.puttagunta@...aro.org, l.stach@...gutronix.de,
thomas.petazzoni@...e-electrons.com,
linux-arm-kernel@...ts.infradead.org, ta.omasab@...il.com,
kesavan.abhilash@...il.com, khilman@...aro.org,
santosh.shilimkar@...cle.com, b.zolnierkie@...sung.com,
Viresh Kumar <viresh.kumar@...aro.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Len Brown <len.brown@...el.com>,
linux-kernel@...r.kernel.org (open list),
Pavel Machek <pavel@....cz>
Subject: [PATCH V3 06/16] PM / OPP: Break _opp_add_dynamic() into smaller functions
Later commits would add support for new OPP bindings and this would be
required then. So, lets do it in a separate patch to make it easily
reviewable.
Another change worth noticing is INIT_LIST_HEAD(&opp->node). We weren't
doing it earlier as we never tried to delete a list node before it is
added to list. But this wouldn't be the case anymore. We might try to
delete a node (just to reuse the same code paths), without it being
getting added to the list.
Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
drivers/base/power/opp.c | 125 ++++++++++++++++++++++++++++-------------------
1 file changed, 76 insertions(+), 49 deletions(-)
diff --git a/drivers/base/power/opp.c b/drivers/base/power/opp.c
index 28d70c9f86ed..0d8dbf21c299 100644
--- a/drivers/base/power/opp.c
+++ b/drivers/base/power/opp.c
@@ -484,6 +484,7 @@ static void _kfree_opp_rcu(struct rcu_head *head)
* _opp_remove() - Remove an OPP from a table definition
* @dev_opp: points back to the device_opp struct this opp belongs to
* @opp: pointer to the OPP to remove
+ * @notify: OPP_EVENT_REMOVE notification should be sent or not
*
* This function removes an opp definition from the opp list.
*
@@ -492,13 +493,14 @@ static void _kfree_opp_rcu(struct rcu_head *head)
* strategy.
*/
static void _opp_remove(struct device_opp *dev_opp,
- struct dev_pm_opp *opp)
+ struct dev_pm_opp *opp, bool notify)
{
/*
* Notify the changes in the availability of the operable
* frequency/voltage list.
*/
- srcu_notifier_call_chain(&dev_opp->srcu_head, OPP_EVENT_REMOVE, opp);
+ if (notify)
+ srcu_notifier_call_chain(&dev_opp->srcu_head, OPP_EVENT_REMOVE, opp);
list_del_rcu(&opp->node);
call_srcu(&dev_opp->srcu_head.srcu, &opp->rcu_head, _kfree_opp_rcu);
@@ -544,12 +546,70 @@ void dev_pm_opp_remove(struct device *dev, unsigned long freq)
goto unlock;
}
- _opp_remove(dev_opp, opp);
+ _opp_remove(dev_opp, opp, true);
unlock:
mutex_unlock(&dev_opp_list_lock);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_remove);
+static struct dev_pm_opp *_allocate_opp(struct device *dev,
+ struct device_opp **dev_opp)
+{
+ struct dev_pm_opp *opp;
+
+ /* allocate new OPP node */
+ opp = kzalloc(sizeof(*opp), GFP_KERNEL);
+ if (!opp)
+ return NULL;
+
+ INIT_LIST_HEAD(&opp->node);
+
+ *dev_opp = _add_device_opp(dev);
+ if (!*dev_opp) {
+ kfree(opp);
+ return NULL;
+ }
+
+ return opp;
+}
+
+static int _opp_add(struct dev_pm_opp *new_opp, struct device_opp *dev_opp)
+{
+ struct dev_pm_opp *opp;
+ struct list_head *head = &dev_opp->opp_list;
+
+ /*
+ * Insert new OPP in order of increasing frequency and discard if
+ * already present.
+ *
+ * Need to use &dev_opp->opp_list in the condition part of the 'for'
+ * loop, don't replace it with head otherwise it will become an infinite
+ * loop.
+ */
+ list_for_each_entry_rcu(opp, &dev_opp->opp_list, node) {
+ if (new_opp->rate > opp->rate) {
+ head = &opp->node;
+ continue;
+ }
+
+ if (new_opp->rate < opp->rate)
+ break;
+
+ /* Duplicate OPPs */
+ dev_warn(dev_opp->dev, "%s: duplicate OPPs detected. Existing: freq: %lu, volt: %lu, enabled: %d. New: freq: %lu, volt: %lu, enabled: %d\n",
+ __func__, opp->rate, opp->u_volt, opp->available,
+ new_opp->rate, new_opp->u_volt, new_opp->available);
+
+ return opp->available && new_opp->u_volt == opp->u_volt ?
+ 0 : -EEXIST;
+ }
+
+ new_opp->dev_opp = dev_opp;
+ list_add_rcu(&new_opp->node, head);
+
+ return 0;
+}
+
/**
* _opp_add_dynamic() - Allocate a dynamic OPP.
* @dev: device for which we do this operation
@@ -581,62 +641,28 @@ static int _opp_add_dynamic(struct device *dev, unsigned long freq,
long u_volt, bool dynamic)
{
struct device_opp *dev_opp;
- struct dev_pm_opp *opp, *new_opp;
- struct list_head *head;
+ struct dev_pm_opp *new_opp;
int ret;
- /* allocate new OPP node */
- new_opp = kzalloc(sizeof(*new_opp), GFP_KERNEL);
- if (!new_opp)
- return -ENOMEM;
-
/* Hold our list modification lock here */
mutex_lock(&dev_opp_list_lock);
+ new_opp = _allocate_opp(dev, &dev_opp);
+ if (!new_opp) {
+ ret = -ENOMEM;
+ goto unlock;
+ }
+
/* populate the opp table */
new_opp->rate = freq;
new_opp->u_volt = u_volt;
new_opp->available = true;
+ new_opp->dynamic = dynamic;
- dev_opp = _add_device_opp(dev);
- if (!dev_opp) {
- ret = -ENOMEM;
- goto free_opp;
- }
-
- /*
- * Insert new OPP in order of increasing frequency
- * and discard if already present
- */
- head = &dev_opp->opp_list;
-
- /*
- * Need to use &dev_opp->opp_list in the condition part of the 'for'
- * loop, don't replace it with head otherwise it will become an infinite
- * loop.
- */
- list_for_each_entry_rcu(opp, &dev_opp->opp_list, node) {
- if (new_opp->rate > opp->rate) {
- head = &opp->node;
- continue;
- }
-
- if (new_opp->rate < opp->rate)
- break;
-
- /* Duplicate OPPs */
- ret = opp->available && new_opp->u_volt == opp->u_volt ?
- 0 : -EEXIST;
-
- dev_warn(dev, "%s: duplicate OPPs detected. Existing: freq: %lu, volt: %lu, enabled: %d. New: freq: %lu, volt: %lu, enabled: %d\n",
- __func__, opp->rate, opp->u_volt, opp->available,
- new_opp->rate, new_opp->u_volt, new_opp->available);
+ ret = _opp_add(new_opp, dev_opp);
+ if (ret)
goto free_opp;
- }
- new_opp->dynamic = dynamic;
- new_opp->dev_opp = dev_opp;
- list_add_rcu(&new_opp->node, head);
mutex_unlock(&dev_opp_list_lock);
/*
@@ -647,8 +673,9 @@ static int _opp_add_dynamic(struct device *dev, unsigned long freq,
return 0;
free_opp:
+ _opp_remove(dev_opp, new_opp, false);
+unlock:
mutex_unlock(&dev_opp_list_lock);
- kfree(new_opp);
return ret;
}
@@ -876,7 +903,7 @@ void of_free_opp_table(struct device *dev)
/* Free static OPPs */
list_for_each_entry_safe(opp, tmp, &dev_opp->opp_list, node) {
if (!opp->dynamic)
- _opp_remove(dev_opp, opp);
+ _opp_remove(dev_opp, opp, true);
}
mutex_unlock(&dev_opp_list_lock);
--
2.4.0
--
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