linux-kernel - Re: [PATCH] platform: x86: hp_wireless: Inform the user if hp_wireless_input

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Message-ID: <20141129000417.GG30997@pd.tnic>
Date:	Sat, 29 Nov 2014 01:04:17 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Giedrius Statkevicius <giedriuswork@...il.com>
Cc:	dvhart@...radead.org, platform-driver-x86@...r.kernel.org,
	linux-kernel@...r.kernel.org, Alex Hung <alex.hung@...onical.com>
Subject: Re: [PATCH] platform: x86: hp_wireless: Inform the user if
 hp_wireless_input_setup()/add() fails

On Sat, Nov 29, 2014 at 01:48:31AM +0200, Giedrius Statkevicius wrote:
> On 2014.11.29 01:15, Borislav Petkov wrote:
> > On Sat, Nov 29, 2014 at 12:14:27AM +0200, Giedrius Statkevicius wrote:
> >> In hpwl_add() there is a unused variable err to which we assign the
> >> result of hp_wireless_input_setup() but we don't do anything depending
> >> on the result so print out a message that informs the user if add()
> >> (hp_wireless_input_setup()) fails since acpi_device_probe() doesn't
> >> print anything in this case.
> >>
> >> Signed-off-by: Giedrius Statkevicius <giedriuswork@...il.com>
> >> ---
> >>  drivers/platform/x86/hp-wireless.c | 3 +++
> >>  1 file changed, 3 insertions(+)
> >>
> >> diff --git a/drivers/platform/x86/hp-wireless.c b/drivers/platform/x86/hp-wireless.c
> >> index 415348f..4e4cc8b 100644
> >> --- a/drivers/platform/x86/hp-wireless.c
> >> +++ b/drivers/platform/x86/hp-wireless.c
> >> @@ -85,6 +85,9 @@ static int hpwl_add(struct acpi_device *device)
> >>  	int err;
> >>  
> >>  	err = hp_wireless_input_setup();
> >> +	if (err)
> >> +		pr_err("Failed to setup hp wireless hotkeys\n");
> >> +
> > 
> > I don't think there's need for that. Just do:
> > 
> > 	return hp_wireless_input_setup();
> > 
> > and drop err completely.
> > 
> > The upper layer which calls the ->add() method should propagate the
> > error properly.
> Looking at other platform drivers code some add() methods do give
> information to the user via pr_{err,warn,info} macros, some don't. My
> first patch to deal with this just removed the err variable like you
> have wrote but Darren Hart and Rafael J. Wysocki commented that maybe it
> should be better to inform the user about this error. That is why
> probably there was a variable for this in the first place but probably
> the original author just forgot to add a pr_err().

Ah, I see. Original author added to CC.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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