linux-kernel - Re: [PATCH v2] iio: stm32-dac: Replace indio

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Message-ID: <c3a9411e-186d-a3ac-5ad0-bd70ad78f147@st.com>
Date:   Thu, 27 Aug 2020 11:03:24 +0200
From:   Fabrice Gasnier <fabrice.gasnier@...com>
To:     Alexandru Ardelean <ardeleanalex@...il.com>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>
CC:     linux-iio <linux-iio@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        LKML <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Jonathan Cameron <jic23@...nel.org>, <alexandre.torgue@...com>,
        Sergiu Cuciurean <sergiu.cuciurean@...log.com>
Subject: Re: [PATCH v2] iio: stm32-dac: Replace indio_dev->mlock with own
 device lock

On 8/27/20 10:55 AM, Alexandru Ardelean wrote:
> On Wed, Aug 26, 2020 at 3:03 PM Alexandru Ardelean
> <alexandru.ardelean@...log.com> wrote:
>> From: Sergiu Cuciurean <sergiu.cuciurean@...log.com>
>>
>> As part of the general cleanup of indio_dev->mlock, this change replaces
>> it with a local lock. The lock protects against potential races when
>> reading the CR reg and then updating, so that the state of pm_runtime
>> is consistent between the two operations.
>>
>> Signed-off-by: Sergiu Cuciurean <sergiu.cuciurean@...log.com>
>> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
>> ---
> Forgot the changelog here.
> Apologies.
> 
> Changelog v1 -> v2:
> * removed whitespace change for 'common' field
> * updated comment about the lock usage

Hi Alexandru,

Sorry if I missed it... is there an update on the comment :-) ?

Best Regards,
Fabrice
> 
>>  drivers/iio/dac/stm32-dac.c | 12 ++++++++----
>>  1 file changed, 8 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/iio/dac/stm32-dac.c b/drivers/iio/dac/stm32-dac.c
>> index 092c796fa3d9..7a8aed476850 100644
>> --- a/drivers/iio/dac/stm32-dac.c
>> +++ b/drivers/iio/dac/stm32-dac.c
>> @@ -26,9 +26,11 @@
>>  /**
>>   * struct stm32_dac - private data of DAC driver
>>   * @common:            reference to DAC common data
>> + * @lock:              lock to protect the data buffer during regmap ops
>>   */
>>  struct stm32_dac {
>>         struct stm32_dac_common *common;
>> +       struct mutex            lock;
>>  };