linux-kernel - Re: [PATCH 1/1] iio: fix config watermark initial value

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Date:	Thu, 16 Jun 2016 18:19:00 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Jonathan Cameron <jic23@...23.retrosnub.co.uk>,
	Daniel Baluta <daniel.baluta@...il.com>,
	Jonathan Cameron <jic23@...nel.org>, laurentiu.palcu@...el.com
Cc:	Irina Tirdea <irina.tirdea@...el.com>,
	"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Hartmut Knaack <knaack.h@....de>,
	Peter Meerwald <pmeerw@...erw.net>,
	Octavian Purdila <octavian.purdila@...el.com>
Subject: Re: [PATCH 1/1] iio: fix config watermark initial value

On 06/16/2016 06:16 PM, Jonathan Cameron wrote:
> 
> 
> On 16 June 2016 12:56:11 BST, Daniel Baluta <daniel.baluta@...il.com> wrote:
>> On Mon, Mar 28, 2016 at 1:02 PM, Jonathan Cameron <jic23@...nel.org>
>> wrote:
>>> On 24/03/16 09:23, Lars-Peter Clausen wrote:
>>>> On 03/24/2016 10:09 AM, Irina Tirdea wrote:
>>>>> config structure is set to 0 when updating the buffers, so by
>>>>> default config->watermark will be 0. When computing the minimum
>>>>> between config->watermark and the buffer->watermark or
>>>>> insert_buffer-watermark, this will always be 0 regardless of the
>>>>> value set by the user for the buffer.
>>>>>
>>>>> Set as initial value for config->watermark the maximum allowed
>>>>> value so that the minimum value will always be set from one of the
>>>>> buffers.
>>>>>
>>>>> Signed-off-by: Irina Tirdea <irina.tirdea@...el.com>
>>>>
>>>> Looks good. This bug was my fault, sorry.
>>>>
>>>> Fixes: f0566c0c405d ("iio: Set device watermark based on watermark
>> of all
>>>> attached buffers")
>>> Applied to the fixes-togreg-post-rc1 branch of iio.git and marked for
>> stable.
>>>
>>> Thanks,
>>>
>>> Jonathan
>>>>
>>>>> ---
>>>>>  drivers/iio/industrialio-buffer.c | 1 +
>>>>>  1 file changed, 1 insertion(+)
>>>>>
>>>>> diff --git a/drivers/iio/industrialio-buffer.c
>> b/drivers/iio/industrialio-buffer.c
>>>>> index b976332..90462fc 100644
>>>>> --- a/drivers/iio/industrialio-buffer.c
>>>>> +++ b/drivers/iio/industrialio-buffer.c
>>>>> @@ -653,6 +653,7 @@ static int iio_verify_update(struct iio_dev
>> *indio_dev,
>>>>>      unsigned int modes;
>>>>>
>>>>>      memset(config, 0, sizeof(*config));
>>>>> +    config->watermark = ~0;
>>>>>
>>>>>      /*
>>>>>       * If there is just one buffer and we are removing it there is
>> nothing
>>>>>
>>>>
>>>
>>> --
>>
>>
>> Hi Jonathan,
>>
>> After a discussion with Laurentiu (Cc'ed), we noticed that this patch
>> is not in the latest IIO (testing, togreg) tree.
>>
>> What is the path of an IIO fixes patch?
>>
>> thanks,
>> Daniel.
> Should be fixes-togreg then staging-linus then mainline.

To add to that once it is in mainline it will trickle down again through
staging/next to iio/togreg. So there might be a fair amount of pipeline
delay until it arrives in iio/{togreg,testing}.