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Groups > linux.kernel > #1718766

[PATCH 02/12] PM / devfreq: Fix locking range for making the frequency table

From Chanwoo Choi <cw00.choi@samsung.com>
Newsgroups linux.kernel
Subject [PATCH 02/12] PM / devfreq: Fix locking range for making the frequency table
Date 2017-08-24 03:50 +0200
Message-ID <uhPrs-8ei-41@gated-at.bofh.it> (permalink)
References <uhPrr-8ei-3@gated-at.bofh.it> <uhPrs-8ei-43@gated-at.bofh.it> <uhPrr-8ei-3@gated-at.bofh.it>
Organization linux.* mail to news gateway

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Even if the freq_table is included in the struct devfreq,
the commit 0ec09ac2cebe ("PM / devfreq: Set the freq_table
of devfreq device") set the frequency table outside the mutex locking.

So, this patch initializes the frequency table within the mutex locking.

Cc: stable@vger.kernel.org
Fixes: 0ec09ac2cebe ("PM / devfreq: Set the freq_table of devfreq device")
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
---
 drivers/devfreq/devfreq.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index a1c4ee818614..3c5ccb96e165 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -553,11 +553,8 @@ struct devfreq *devfreq_add_device(struct device *dev,
 	devfreq->data = data;
 	devfreq->nb.notifier_call = devfreq_notifier_call;
 
-	if (!devfreq->profile->max_state && !devfreq->profile->freq_table) {
-		mutex_unlock(&devfreq->lock);
+	if (!devfreq->profile->max_state && !devfreq->profile->freq_table)
 		devfreq_set_freq_table(devfreq);
-		mutex_lock(&devfreq->lock);
-	}
 
 	dev_set_name(&devfreq->dev, "devfreq%d",
 				atomic_inc_return(&devfreq_no));
-- 
1.9.1

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Thread

[PATCH 00/12] PM / devfreq: Use OPP interface to handle the  frequency Chanwoo Choi <cw00.choi@samsung.com> - 2017-08-24 03:50 +0200
  [PATCH 02/12] PM / devfreq: Fix locking range for making the  frequency table Chanwoo Choi <cw00.choi@samsung.com> - 2017-08-24 03:50 +0200
  [PATCH 12/12] PM / devfreq: Add opp_notifier_cb() function pointer  to support OPP notifier Chanwoo Choi <cw00.choi@samsung.com> - 2017-08-24 03:50 +0200
    Re: [PATCH 12/12] PM / devfreq: Add opp_notifier_cb() function  pointer to support OPP notifier Chanwoo Choi <cw00.choi@samsung.com> - 2017-08-24 06:00 +0200
  [PATCH 10/12] PM / devfreq: Remove 'devfreq' prefix from helper  function Chanwoo Choi <cw00.choi@samsung.com> - 2017-08-24 03:50 +0200
  [PATCH 11/12] PM / devfreq: Remove exported opp_notifier function Chanwoo Choi <cw00.choi@samsung.com> - 2017-08-24 03:50 +0200

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