On 13/03/17 19:53, Alison Schofield wrote:
> On Mon, Mar 13, 2017 at 10:01:07PM +0530, simran singhal wrote:
>> The IIO subsystem is redefining iio_dev->mlock to be used by
>> the IIO core only for protecting device operating mode changes.
>> ie. Changes between INDIO_DIRECT_MODE, INDIO_BUFFER_* modes.
>>
>> In this driver, mlock was being used to protect hardware state
>> changes. Replace it with a lock in the devices global data.
>>
>> Fix some coding style issues related to white space also.
>>
>> Signed-off-by: simran singhal <singhalsimran0@xxxxxxxxx>
>> ---
>>
>> v2:
>> -Removed new lock to reuse the existing lock
> Simran,
>
> The good news is that you have 2 patches that have similar
> challenges! I'll suggest picking one, drive it to completion,
> then do the other.
>
> This has the nested locking issue that Lars warned about.
> Need to refactor to avoid. Check back on his review comments.
>
> I suggest dropping those whitespace changes - they appear
> out of place in this patch since you are no longer actually
> touching those lines of code.
>
> alisons
Also missing a mutex_init, though that may well become irrelevant
with refactoring as suggested.
>
>
>>
>> drivers/staging/iio/meter/ade7753.c | 12 ++++++------
>> 1 file changed, 6 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/staging/iio/meter/ade7753.c b/drivers/staging/iio/meter/ade7753.c
>> index dfd8b71..d88eaa3 100644
>> --- a/drivers/staging/iio/meter/ade7753.c
>> +++ b/drivers/staging/iio/meter/ade7753.c
>> @@ -83,10 +83,10 @@
>> * @buf_lock: mutex to protect tx and rx
>> **/
>> struct ade7753_state {
>> - struct spi_device *us;
>> - struct mutex buf_lock;
>> - u8 tx[ADE7753_MAX_TX] ____cacheline_aligned;
>> - u8 rx[ADE7753_MAX_RX];
>> + struct spi_device *us;
>> + struct mutex buf_lock;
>> + u8 tx[ADE7753_MAX_TX] ____cacheline_aligned;
>> + u8 rx[ADE7753_MAX_RX];
>> };
>>
>> static int ade7753_spi_write_reg_8(struct device *dev,
>> @@ -484,7 +484,7 @@ static ssize_t ade7753_write_frequency(struct device *dev,
>> if (!val)
>> return -EINVAL;
>>
>> - mutex_lock(&indio_dev->mlock);
>> + mutex_lock(&st->buf_lock);
>>
>> t = 27900 / val;
>> if (t > 0)
>> @@ -505,7 +505,7 @@ static ssize_t ade7753_write_frequency(struct device *dev,
>> ret = ade7753_spi_write_reg_16(dev, ADE7753_MODE, reg);
>>
>> out:
>> - mutex_unlock(&indio_dev->mlock);
>> + mutex_unlock(&st->buf_lock);
>>
>> return ret ? ret : len;
>> }
>> --
>> 2.7.4
>>
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