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 <singhalsimr...@gmail.com>
>> ---
>>
>>  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
>>
>> -- 
>> You received this message because you are subscribed to the Google Groups 
>> "outreachy-kernel" group.
>> To unsubscribe from this group and stop receiving emails from it, send an 
>> email to outreachy-kernel+unsubscr...@googlegroups.com.
>> To post to this group, send email to outreachy-ker...@googlegroups.com.
>> To view this discussion on the web visit 
>> https://groups.google.com/d/msgid/outreachy-kernel/20170313163107.GA31496%40singhal-Inspiron-5558.
>> For more options, visit https://groups.google.com/d/optout.
> --
> To unsubscribe from this list: send the line "unsubscribe linux-iio" in
> the body of a message to majord...@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 

_______________________________________________
devel mailing list
de...@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel

Reply via email to