linux-kernel - Re: [PATCH] iio: light: isl29125: use iio helper function to guarantee direct mode

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Date:	Sat, 11 Jun 2016 17:17:03 +0100
From:	Jonathan Cameron <jic23@...nel.org>
To:	Peter Meerwald-Stadler <pmeerw@...erw.net>,
	Alison Schofield <amsfield22@...il.com>
Cc:	knaack.h@....de, lars@...afoo.de, linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: light: isl29125: use iio helper function to
 guarantee direct mode

On 11/06/16 17:05, Jonathan Cameron wrote:
> On 11/06/16 16:57, Jonathan Cameron wrote:
>> On 07/06/16 06:23, Peter Meerwald-Stadler wrote:
>>>
>>>> Replace the code that guarantees the device stays in direct mode
>>>> with iio_device_claim_direct_mode() which does same.  This allows
>>>> removal of an unused lock in the device private global data.
>>>
>>> nice!
>>> Acked-by: Peter Meerwald-Stadler <pmeerw@...erw.net>
>> Applied and pushed out as testing for the autobuilders to play with it.
> Actually hold that - see the tcs3472 response.  This lock isn't actually
> here to prevent the buffer running at the same time as the raw call...
> 
> Backed out for now.
Reapplied... 
> 
> Jonathan
>>
>> Thanks,
>>
>> Jonathan
>>>
>>>> Signed-off-by: Alison Schofield <amsfield22@...il.com>
>>>> Cc: Daniel Baluta <daniel.baluta@...il.com>
>>>> ---
>>>>  drivers/iio/light/isl29125.c | 10 ++++------
>>>>  1 file changed, 4 insertions(+), 6 deletions(-)
>>>>
>>>> diff --git a/drivers/iio/light/isl29125.c b/drivers/iio/light/isl29125.c
>>>> index e2945a2..a6b9d66 100644
>>>> --- a/drivers/iio/light/isl29125.c
>>>> +++ b/drivers/iio/light/isl29125.c
>>>> @@ -50,7 +50,6 @@
>>>>  
>>>>  struct isl29125_data {
>>>>  	struct i2c_client *client;
>>>> -	struct mutex lock;
>>>>  	u8 conf1;
>>>>  	u16 buffer[8]; /* 3x 16-bit, padding, 8 bytes timestamp */
>>>>  };
>>>> @@ -128,11 +127,11 @@ static int isl29125_read_raw(struct iio_dev *indio_dev,
>>>>  
>>>>  	switch (mask) {
>>>>  	case IIO_CHAN_INFO_RAW:
>>>> -		if (iio_buffer_enabled(indio_dev))
>>>> -			return -EBUSY;
>>>> -		mutex_lock(&data->lock);
>>>> +		ret = iio_device_claim_direct_mode(indio_dev);
>>>> +		if (ret)
>>>> +			return ret;
>>>>  		ret = isl29125_read_data(data, chan->scan_index);
>>>> -		mutex_unlock(&data->lock);
>>>> +		iio_device_release_direct_mode(indio_dev);
>>>>  		if (ret < 0)
>>>>  			return ret;
>>>>  		*val = ret;
>>>> @@ -259,7 +258,6 @@ static int isl29125_probe(struct i2c_client *client,
>>>>  	data = iio_priv(indio_dev);
>>>>  	i2c_set_clientdata(client, indio_dev);
>>>>  	data->client = client;
>>>> -	mutex_init(&data->lock);
>>>>  
>>>>  	indio_dev->dev.parent = &client->dev;
>>>>  	indio_dev->info = &isl29125_info;
>>>>
>>>
>>
>> --
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> 
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