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From: MyungJoo Ham <myungjoo.ham@samsung.com>
To: Chanwoo Choi <cw00.choi@samsung.com>, Sibi Sankar <sibis@codeaurora.org>
Cc: Kyungmin Park <kyungmin.park@samsung.com>,
	"linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-arm-msm-owner@vger.kernel.org" 
	<linux-arm-msm-owner@vger.kernel.org>,
	Saravana Kannan <skannan@codeaurora.org>
Subject: RE: [PATCH v5] PM / devfreq: Restart previous governor if new governor fails to start
Date: Tue, 12 Mar 2019 16:17:14 +0900
Message-ID: <20190312071714epcms1p20e78a537f8cb0d7d04e4fd077916fd51@epcms1p2> (raw)
In-Reply-To: <CGME20190311100759epcas5p41fc634cd67a99b39cd25c4129e489c4c@epcms1p2>

>From: Saravana Kannan <skannan@codeaurora.org>
>
>If the new governor fails to start, switch back to old governor so that the
>devfreq state is not left in some weird limbo.
>
>[Mjungjoo: assume fatal on revert failure and set df->governor to NULL]
>Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
>Signed-off-by: Saravana Kannan <skannan@codeaurora.org>
>Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>

I'll modify WARN->ERROR for the case when it's fatal:

>+		if (ret) {
>+			dev_warn(dev,
>+				 "%s: reverting to Governor %s failed (%d)\n",
>+				 __func__, df->governor_name, ret);
>+			df->governor = NULL;
>+		}

Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com>


>---
>V5:
>* assume fatal on revert failure and set df->governor to NULL
>
>V4:
>* Removed prev_governor check.
>
>V3:
>* Fix NULL deref for real this time.
>* Addressed some style preferences.
>
>V2:
>* Fixed typo in commit text
>* Fixed potential NULL deref
>
> drivers/devfreq/devfreq.c | 16 ++++++++++++++--
> 1 file changed, 14 insertions(+), 2 deletions(-)
>

  parent reply index

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-11 10:06 Sibi Sankar
     [not found] ` <CGME20190311100759epcas5p41fc634cd67a99b39cd25c4129e489c4c@epcms1p2>
2019-03-12  7:17   ` MyungJoo Ham [this message]
2019-03-13  6:01     ` Sibi Sankar

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