linux-kernel - Re: [PATCH] IIO: Change msleep to usleep

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Date:   Wed, 30 Nov 2016 14:35:47 +0100
From:   Lars-Peter Clausen <lars@...afoo.de>
To:     Jonathan Cameron <jic23@...nel.org>,
        Aniroop Mathur <a.mathur@...sung.com>, knaack.h@....de,
        pmeerw@...erw.net, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     s.samuel@...sung.com, r.mahale@...sung.com,
        aniroop.mathur@...il.com,
        Naveen Krishna Chatradhi <ch.naveen@...sung.com>,
        Linus Walleij <linus.walleij@...ricsson.com>,
        Vlad Dogaru <vlad.dogaru@...el.com>
Subject: Re: [PATCH] IIO: Change msleep to usleep_range for small msecs

On 11/27/2016 11:51 AM, Jonathan Cameron wrote:
> On 26/11/16 03:47, Aniroop Mathur wrote:
>> msleep(1~20) may not do what the caller intends, and will often sleep longer.
>> (~20 ms actual sleep for any value given in the 1~20ms range)
>> This is not the desired behaviour for many cases like device resume time,
>> device suspend time, device enable time, data reading time, etc.
>> Thus, change msleep to usleep_range for precise wakeups.
>>
>> Signed-off-by: Aniroop Mathur <a.mathur@...sung.com>
> As these need individual review by the various original authors and driver maintainers to
> establish the intent of the sleep, it would have been better to have done a series of
> patches (one per driver) with the relevant maintainers cc'd on the ones that they care about.
> 
> Most of these are ADI parts looked after by Lars though so perhaps wait for his comments
> before respining.

I agree with what Jonathan said. For most of these extending the maximum
sleep time a bit further is ok.