linux-kernel - Re: [PATCH] Remove ambiguous logging for "Unsupported brightness interface"

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20160207201324.GH1779@malice.jf.intel.com>
Date:	Sun, 7 Feb 2016 12:13:24 -0800
From:	Darren Hart <dvhart@...radead.org>
To:	Eric Curtin <ericcurtin17@...il.com>
Cc:	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Joe Perches <joe@...ches.com>,
	platform-driver-x86@...r.kernel.org,
	Kernel development list <linux-kernel@...r.kernel.org>,
	ibm-acpi-devel@...ts.sourceforge.net
Subject: Re: [PATCH] Remove ambiguous logging for "Unsupported brightness
 interface"

On Sat, Jan 30, 2016 at 04:55:59PM +0000, Eric Curtin wrote:
> On 30 January 2016 at 12:20, Henrique de Moraes Holschuh <hmh@....eng.br> wrote:
> > On Wed, 27 Jan 2016, Joe Perches wrote:
> >> On Wed, 2016-01-27 at 22:14 +0000, Eric Curtin wrote:
> >> > Message gets logged on machines that are well supported.
> >> >
> >> > Signed-off-by: Eric Curtin <ericcurtin17@...il.com>
> >> > ---
> >> >  drivers/platform/x86/thinkpad_acpi.c | 1 -
> >> >  1 file changed, 1 deletion(-)
> >> >
> >> > diff --git a/drivers/platform/x86/thinkpad_acpi.c
> >> > b/drivers/platform/x86/thinkpad_acpi.c
> >> > index a268a7a..4eb41aa 100644
> >> > --- a/drivers/platform/x86/thinkpad_acpi.c
> >> > +++ b/drivers/platform/x86/thinkpad_acpi.c
> >> > @@ -6661,7 +6661,6 @@ static void __init
> >> > tpacpi_detect_brightness_capabilities(void)
> >> >                 pr_info("detected a 8-level brightness capable
> >> > ThinkPad\n");
> >> >                 break;
> >> >         default:
> >> > -               pr_info("Unsupported brightness interface\n");
> >> >                 tp_features.bright_unkfw = 1;
> >> >                 bright_maxlvl = b - 1;
> >> >         }
> >>
> >> Perhaps this should be something like this instead:
> >> ---
> >>  drivers/platform/x86/thinkpad_acpi.c | 4 +---
> >>  1 file changed, 1 insertion(+), 3 deletions(-)
> >>
> >> diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
> >> index a268a7a..bd12c71 100644
> >> --- a/drivers/platform/x86/thinkpad_acpi.c
> >> +++ b/drivers/platform/x86/thinkpad_acpi.c
> >> @@ -6653,18 +6653,16 @@ static void __init tpacpi_detect_brightness_capabilities(void)
> >>       switch (b) {
> >>       case 16:
> >>               bright_maxlvl = 15;
> >> -             pr_info("detected a 16-level brightness capable ThinkPad\n");
> >>               break;
> >>       case 8:
> >>       case 0:
> >>               bright_maxlvl = 7;
> >> -             pr_info("detected a 8-level brightness capable ThinkPad\n");
> >>               break;
> >>       default:
> >> -             pr_info("Unsupported brightness interface\n");
> >>               tp_features.bright_unkfw = 1;
> >>               bright_maxlvl = b - 1;
> >>       }
> >> +     pr_info("detected %u brightness levels\n", bright_maxlvl + 1);
> >>  }
> >
> > This can be made pr_debug, since we're touching it...
> >
> > --
> >   "One disk to rule them all, One disk to find them. One disk to bring
> >   them all and in the darkness grind them. In the Land of Redmond
> >   where the shadows lie." -- The Silicon Valley Tarot
> >   Henrique Holschuh
> 
> "Unsupported brightness interface" message gets logged on
>  machines that are well supported.
> 
> Signed-off-by: Eric Curtin <ericcurtin17@...il.com>
> ---
>  drivers/platform/x86/thinkpad_acpi.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/platform/x86/thinkpad_acpi.c
> b/drivers/platform/x86/thinkpad_acpi.c
> index a268a7a..e305ab5 100644
> --- a/drivers/platform/x86/thinkpad_acpi.c
> +++ b/drivers/platform/x86/thinkpad_acpi.c
> @@ -6653,18 +6653,16 @@ static void __init
> tpacpi_detect_brightness_capabilities(void)
>         switch (b) {
>         case 16:
>                 bright_maxlvl = 15;
> -               pr_info("detected a 16-level brightness capable ThinkPad\n");
>                 break;
>         case 8:
>         case 0:
>                 bright_maxlvl = 7;
> -               pr_info("detected a 8-level brightness capable ThinkPad\n");
>                 break;
>         default:
> -               pr_info("Unsupported brightness interface\n");
>                 tp_features.bright_unkfw = 1;
>                 bright_maxlvl = b - 1;
>         }
> +       pr_debug("detected %u brightness levels\n", bright_maxlvl + 1);

This patch is malformed, has whitespace issues, and doesn't apply. Please apply
all patches before sending them to the list.

Given it's trivial, I made the change manually and have queued this up to the
testing branch.

Thanks,

-- 
Darren Hart
Intel Open Source Technology Center