linux-kernel - Re: [PATCH v3 0/7] iio: core: Introduce cleanup.h support for mode locks

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Message-Id: <DFR4EFO39YMN.2B4GMZC3TPMQ8@gmail.com>
Date: Sat, 17 Jan 2026 14:44:21 -0500
From: "Kurt Borja" <kuurtb@...il.com>
To: "David Lechner" <dlechner@...libre.com>, "Kurt Borja"
 <kuurtb@...il.com>, "Andy Shevchenko" <andriy.shevchenko@...el.com>,
 "Lars-Peter Clausen" <lars@...afoo.de>, "Michael Hennerich"
 <Michael.Hennerich@...log.com>, "Jonathan Cameron" <jic23@...nel.org>,
 "Benson Leung" <bleung@...omium.org>, "Antoniu Miclaus"
 <antoniu.miclaus@...log.com>, "Gwendal Grignou" <gwendal@...omium.org>,
 "Shrikant Raskar" <raskar.shree97@...il.com>, "Per-Daniel Olsson"
 <perdaniel.olsson@...s.com>
Cc: Nuno Sá <nuno.sa@...log.com>, "Andy Shevchenko"
 <andy@...nel.org>, "Guenter Roeck" <groeck@...omium.org>, "Jonathan
 Cameron" <Jonathan.Cameron@...wei.com>, <linux-iio@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>, <chrome-platform@...ts.linux.dev>
Subject: Re: [PATCH v3 0/7] iio: core: Introduce cleanup.h support for mode
 locks

On Fri Jan 16, 2026 at 5:08 PM -05, David Lechner wrote:
> On 1/6/26 2:06 AM, Kurt Borja wrote:
>> Hi,
>> 
>> In a recent driver review discussion [1], Andy Shevchenko suggested we
>> add cleanup.h support for the lock API:
>> 
>> 	iio_device_claim_{direct,buffer_mode}().
>> 
>> Which would allow some nice code simplification in many places. Some
>> examples are given as patches, but the last two are the biggest
>> differences.
>> 
>> In this version I dropped the RFC tag, as the general feeling is to go
>> through with this after some modifications. Main one is the addition of
>> IIO_DEV_ACQUIRE_{BUFFER,CLAIM}_MODE() wrappers to avoid drivers using
>> the guard classes directly. I also added comments on the forbidden ways
>> to use this API but I definitely still take suggestions on this.
>> 
>> For now I dropped iio_device_claim_buffer_mode() rename, as this point
>> is still being discussed. My suggestion based on the RFC discussion is
>> to do it, but in a separate patch (using coccinelle) and while we're at
>> it rename the whole API like this:
>> 
>> 	iio_dev_mode_lock()
>> 	iio_dev_mode_direct_trylock()
>> 	iio_dev_mode_buffer_trylock()
>> 	iio_dev_mode_unlock()
>> 
>> Let me know what you think and thanks for taking a look!
>> 
>> Signed-off-by: Kurt Borja <kuurtb@...il.com>
>> ---
> Like Jonathan, I just had a few minor suggestions, but overall:
>
> Reviewed-by: David Lechner <dlechner@...libre.com>

Hi David,

I'll add your remarks in the next version. Thanks for all the feedback!


-- 
Thanks,
 ~ Kurt