linux-kernel - Re: [PATCH] HID: logitech-hidpp: avoid repeated "multiplier = " log messages

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Date:   Mon, 06 Jul 2020 14:03:31 +0100
From:   Filipe Laíns <lains@...hlinux.org>
To:     "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>,
        Peter Hutterer <peter.hutterer@...-t.net>
Cc:     Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Harry Cutts <hcutts@...omium.org>, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] HID: logitech-hidpp: avoid repeated "multiplier = "
 log messages

On Mon, 2020-07-06 at 14:41 +0200, Maciej S. Szmigiero wrote:
> On 06.07.2020 14:38, Filipe Laíns wrote:
> > On Sun, 2020-07-05 at 19:34 +0200, Maciej S. Szmigiero wrote:
> > > These messages appear each time the mouse wakes from sleep, in my
> > > case
> > > (Logitech M705), every minute or so.
> > > Let's downgrade them to the "debug" level so they don't fill the
> > > kernel log
> > > by default.
> > > 
> > > While we are at it, let's make clear that this is a wheel multiplier
> > > (and
> > > not, for example, XY movement multiplier).
> > > 
> > > Fixes: 4435ff2f09a2 ("HID: logitech: Enable high-resolution scrolling
> > > on Logitech mice")
> > > Cc: stable@...r.kernel.org
> > > Signed-off-by: Maciej S. Szmigiero <mail@...iej.szmigiero.name>
> > > ---
> > > Sending again since the previous message bounced for most recipients.
> > > 
> > >  drivers/hid/hid-logitech-hidpp.c | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > 
> > > diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-
> > > logitech-hidpp.c
> > > index 1e1cf8eae649..b8b53dc95e86 100644
> > > --- a/drivers/hid/hid-logitech-hidpp.c
> > > +++ b/drivers/hid/hid-logitech-hidpp.c
> > > @@ -3146,7 +3146,7 @@ static int hi_res_scroll_enable(struct
> > > hidpp_device *hidpp)
> > >  		multiplier = 1;
> > >  
> > >  	hidpp->vertical_wheel_counter.wheel_multiplier = multiplier;
> > > -	hid_info(hidpp->hid_dev, "multiplier = %d\n", multiplier);
> > > +	hid_dbg(hidpp->hid_dev, "wheel multiplier = %d\n", multiplier);
> > >  	return 0;
> > >  }
> > >  
> > 
> > I have seen this being useful in some cases, however I do not have a
> > strong opinion on it. Peter would know better.
> 
> Well, the message is not being removed, only hidden by default, so
> it doesn't fill the kernel log.
> 
> One can still enable it at runtime if wanted.

Of course, but instructing users to do that can be annoying, especially
when you're handling a considerable volume of reports.

Anyway, I am fine with this patch, I just thought it was pertinent to
raise this point and maybe get Peter's input on this, as he will likely
be one most affected by it :)

Filipe Laíns

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