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

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Date:   Sat, 3 Dec 2016 00:31:18 +0530
From:   Aniroop Mathur <aniroop.mathur@...il.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Aniroop Mathur <a.mathur@...sung.com>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald <pmeerw@...erw.net>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        s.samuel@...sung.com, r.mahale@...sung.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 Wed, Nov 30, 2016 at 5:49 PM, Linus Walleij <linus.walleij@...aro.org> wrote:
> On Sun, Nov 27, 2016 at 11:51 AM, Jonathan Cameron <jic23@...nel.org> wrote:
>> On 26/11/16 03:47, Aniroop Mathur wrote:
>
> [bmp280.c]
>
>>>       /* Wait to make sure we started up properly */
>>> -     mdelay(data->start_up_time);
>>> +     usleep_range(data->start_up_time, data->start_up_time + 100);
>>
>> As this in probe I doubt we really care.  Could just set it longer to shut up the warnings.
>> Still would like some input from say Linus on this...
>
> Hm, I don't think it's a big issue... this works too it just looks overworked.
>
> On the runtime_resume() path we use msleep() instead which I guess is why
> it is not changed in this patch, but they have the same purpose.
>

I did change msleep to usleep_range in runtime_resume() in bmp280.c
as you know resume time is critical indeed.


> Yours,
> Linus Walleij