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Tue, 26 May 2020 10:34:03 +0200 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 31FC410002A; Tue, 26 May 2020 10:34:02 +0200 (CEST) Received: from Webmail-eu.st.com (sfhdag3node2.st.com [10.75.127.8]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 203162BE22E; Tue, 26 May 2020 10:34:02 +0200 (CEST) Received: from gnbcxd0016.gnb.st.com (10.75.127.50) by SFHDAG3NODE2.st.com (10.75.127.8) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Tue, 26 May 2020 10:34:01 +0200 Date: Tue, 26 May 2020 10:34:00 +0200 From: Alain Volmat To: Dinghao Liu Subject: Re: [PATCH] i2c: stm32f7: Fix runtime PM imbalance in stm32f7_i2c_reg_slave Message-ID: <20200526083400.GC10725@gnbcxd0016.gnb.st.com> Mail-Followup-To: Dinghao Liu , kjlu@umn.edu, Pierre-Yves MORDRET , Maxime Coquelin , Alexandre Torgue , linux-i2c@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20200521070507.13015-1-dinghao.liu@zju.edu.cn> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200521070507.13015-1-dinghao.liu@zju.edu.cn> X-Disclaimer: ce message est personnel / this message is private X-Originating-IP: [10.75.127.50] X-ClientProxiedBy: SFHDAG1NODE2.st.com (10.75.127.2) To SFHDAG3NODE2.st.com (10.75.127.8) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216, 18.0.687 definitions=2020-05-25_12:2020-05-25, 2020-05-25 signatures=0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200526_013409_842784_5DC9AAA4 X-CRM114-Status: GOOD ( 18.42 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Alexandre Torgue , kjlu@umn.edu, linux-kernel@vger.kernel.org, Pierre-Yves MORDRET , linux-i2c@vger.kernel.org, Maxime Coquelin , linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Dinghao, Thanks for the patch. Indeed, this should be fixed. Overall, there are several other calls to pm_runtime_get_sync within this driver, would you like to fix them all at once ? On Thu, May 21, 2020 at 03:05:07PM +0800, Dinghao Liu wrote: > pm_runtime_get_sync() increments the runtime PM usage counter even > the call returns an error code. Thus a pairing decrement is needed > on the error handling path to keep the counter balanced. > > Signed-off-by: Dinghao Liu > --- > drivers/i2c/busses/i2c-stm32f7.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c > index 330ffed011e0..602cf35649c8 100644 > --- a/drivers/i2c/busses/i2c-stm32f7.c > +++ b/drivers/i2c/busses/i2c-stm32f7.c > @@ -1767,8 +1767,10 @@ static int stm32f7_i2c_reg_slave(struct i2c_client *slave) > return ret; > > ret = pm_runtime_get_sync(dev); > - if (ret < 0) > + if (ret < 0) { > + pm_runtime_put_autosuspend(dev); Considering that if we fail here there is a very good chance that this is due to the resume failing, pm_runtime_put_noidle would probably make more sense since pm_runtime_put_autosuspend will most probably fail as well. > return ret; > + } > > if (!stm32f7_i2c_is_slave_registered(i2c_dev)) > stm32f7_i2c_enable_wakeup(i2c_dev, true); > -- > 2.17.1 > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel