lkml.org 
[lkml]   [2014]   [Dec]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 3/4] PM / OPP: take RCU lock in dev_pm_opp_get_opp_count
Date
A lot of callers are missing the fact that dev_pm_opp_get_opp_count
needs to be called under RCU lock. Given that RCU locks can safely be
nested, instead of providing *_locked() API, let's take RCU lock inside
dev_pm_opp_get_opp_count() and leave callers as is.

Signed-off-by: Dmitry Torokhov <dtor@chromium.org>
---
drivers/base/power/opp.c | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/base/power/opp.c b/drivers/base/power/opp.c
index 413c7fe..ee5eca2 100644
--- a/drivers/base/power/opp.c
+++ b/drivers/base/power/opp.c
@@ -216,9 +216,7 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq);
* This function returns the number of available opps if there are any,
* else returns 0 if none or the corresponding error value.
*
- * Locking: This function must be called under rcu_read_lock(). This function
- * internally references two RCU protected structures: device_opp and opp which
- * are safe as long as we are under a common RCU locked section.
+ * Locking: This function takes rcu_read_lock().
*/
int dev_pm_opp_get_opp_count(struct device *dev)
{
@@ -226,13 +224,14 @@ int dev_pm_opp_get_opp_count(struct device *dev)
struct dev_pm_opp *temp_opp;
int count = 0;

- opp_rcu_lockdep_assert();
+ rcu_read_lock();

dev_opp = find_device_opp(dev);
if (IS_ERR(dev_opp)) {
- int r = PTR_ERR(dev_opp);
- dev_err(dev, "%s: device OPP not found (%d)\n", __func__, r);
- return r;
+ count = PTR_ERR(dev_opp);
+ dev_err(dev, "%s: device OPP not found (%d)\n",
+ __func__, count);
+ goto out_unlock;
}

list_for_each_entry_rcu(temp_opp, &dev_opp->opp_list, node) {
@@ -240,6 +239,8 @@ int dev_pm_opp_get_opp_count(struct device *dev)
count++;
}

+out_unlock:
+ rcu_read_unlock();
return count;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_count);
--
2.2.0.rc0.207.ga3a616c


\
 
 \ /
  Last update: 2014-12-17 00:41    [W:0.166 / U:0.476 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site