linux-kernel - Re: [PATCH 4/4] platform/x86: wmi: Fix check for method instance number

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Message-ID: <20170817211319.GA20526@pali>
Date:   Thu, 17 Aug 2017 23:13:19 +0200
From:   Pali Rohár <pali.rohar@...il.com>
To:     Darren Hart <dvhart@...radead.org>
Cc:     Corentin Chary <corentin.chary@...il.com>,
        Andy Shevchenko <andy@...radead.org>,
        acpi4asus-user@...ts.sourceforge.net,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] platform/x86: wmi: Fix check for method instance
 number

On Thursday 17 August 2017 08:24:31 Darren Hart wrote:
> On Sat, Aug 12, 2017 at 09:44:18AM +0200, Pali Rohár wrote:
> > instance_count defines number of instances of data block and instance
> > itself is indexed from zero, which means first instance has number 0.
> > Therefore check for invalid instance should be non-strict inequality.
> > 
> > Signed-off-by: Pali Rohár <pali.rohar@...il.com>
> 
> This is correct per the WMI specification. Pali, now that Andy has
> applied 1-3 of this series, is that all the required driver updates?

Hmmm... I have not understood your question.

I checked that all drivers which uses instance id 1 have comment
explaining why is id 1 used.

Problematic drivers without comment have either patch to use instance id
0 in this series or somebody else already supplied patch which is part
of linus tree.

> Reviewed-by: Darren Hart (VMware) <dvhart@...radead.org>
> 
> 
> > ---
> >  drivers/platform/x86/wmi.c |    6 +++---
> >  1 file changed, 3 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
> > index e32ba57..0765b17 100644
> > --- a/drivers/platform/x86/wmi.c
> > +++ b/drivers/platform/x86/wmi.c
> > @@ -218,7 +218,7 @@ acpi_status wmi_evaluate_method(const char *guid_string, u8 instance,
> >  	if (!(block->flags & ACPI_WMI_METHOD))
> >  		return AE_BAD_DATA;
> >  
> > -	if (block->instance_count < instance)
> > +	if (block->instance_count <= instance)
> >  		return AE_BAD_PARAMETER;
> >  
> >  	input.count = 2;
> > @@ -265,7 +265,7 @@ static acpi_status __query_block(struct wmi_block *wblock, u8 instance,
> >  	block = &wblock->gblock;
> >  	handle = wblock->acpi_device->handle;
> >  
> > -	if (block->instance_count < instance)
> > +	if (block->instance_count <= instance)
> >  		return AE_BAD_PARAMETER;
> >  
> >  	/* Check GUID is a data block */
> > @@ -392,7 +392,7 @@ acpi_status wmi_set_block(const char *guid_string, u8 instance,
> >  	block = &wblock->gblock;
> >  	handle = wblock->acpi_device->handle;
> >  
> > -	if (block->instance_count < instance)
> > +	if (block->instance_count <= instance)
> >  		return AE_BAD_PARAMETER;
> >  
> >  	/* Check GUID is a data block */
> > -- 
> > 1.7.9.5
> > 
> > 
> 

-- 
Pali Rohár
pali.rohar@...il.com