linux-kernel - Re: [Outreachy kernel] [PATCH] staging: nvec: cleanup USLEEP

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Date:   Wed, 8 Mar 2017 13:46:42 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Marc Dietrich <marvin24@....de>
Cc:     SIMRAN SINGHAL <singhalsimran0@...il.com>,
        linux-tegra@...r.kernel.org,
        outreachy-kernel <outreachy-kernel@...glegroups.com>,
        gregkh@...uxfoundation.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: Re: [Outreachy kernel] [PATCH] staging: nvec: cleanup
 USLEEP_RANGEcheckpatch checks

On Thu, Mar 02, 2017 at 03:57:01PM +0100, Marc Dietrich wrote:
> Hi Simran,
> 
> Am Donnerstag, 2. März 2017, 15:48:13 CET schrieb SIMRAN SINGHAL:
> > On Thursday, March 2, 2017 at 8:06:40 PM UTC+5:30, Julia Lawall wrote:
> > > On Thu, 2 Mar 2017, simran singhal wrote:
> > > > Resolve strict checkpatch USLEEP_RANGE checks by converting delays and
> > > > sleeps as described in ./Documentation/timers/timers-howto.txt.
> > > > 
> > > > CHECK: usleep_range is preferred over udelay; see Documentation/
> > > > timers/timers-howto.txt
> > > > 
> > > > Signed-off-by: simran singhal <singhal...@...il.com <javascript:>>
> 
> I prefer not to change this. The whole interrupt routine is very wonky, and 
> changing some delays might break the communication with the i2c master. Also 
> this is in interrupt context, so a change to usleep_range may not by 
> justified.

Yeah, I think this is going to trigger a WARN_ON from somewhere in the
scheduler because of the interrupt context. I suppose checkpatch could
be made smarter about this, though I doubt my perl skills would be up
to it.

Thierry

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