Subject: Re: [patch 1/5] powerpc: Sky CPU: redundant or incorrect tests on unsigned

From: Benjamin Herrenschmidt <[email-masked]>
Date: Fri, 18 Dec 2009 14:45:10 +1100

On Fri, 2009-12-18 at 14:40 +1100, Benjamin Herrenschmidt wrote:
> On Thu, 2009-12-17 at 16:44 -0800, [email-masked] wrote:
> > From: Roel Kluin <[email-masked]>
> > 
> > count is unsigned and cannot be less than 0.
> 
> Is this really a powerpc thing ?
> 
> This driver is only build with CONFIG_HDPU_FEATURES and a git grep
> HDPU_FEATURES returns no Kconfig that defines it :-)
> 
> I'm happy to apply such a trivial thing but it's weird isn't it ?

Ok so it looks like some old stuff that got removed a long time ago and
never made it to arch/powerpc.

I'll send a patch to just remove the whole driver, it's stale.

Cheers,
Ben.

> Cheers,
> Ben.
> 
> > Signed-off-by: Roel Kluin <[email-masked]>
> > Acked-by: Cyrill Gorcunov <[email-masked]>
> > Cc: Benjamin Herrenschmidt <[email-masked]>
> > Cc: Kumar Gala <[email-masked]>
> > Cc: Brian Waite <[email-masked]>
> > Signed-off-by: Andrew Morton <[email-masked]>
> > ---
> > 
> >  drivers/misc/hdpuftrs/hdpu_cpustate.c |    5 -----
> >  1 file changed, 5 deletions(-)
> > 
> > diff -puN drivers/misc/hdpuftrs/hdpu_cpustate.c~powerpc-sky-cpu-redundant-or-incorrect-tests-on-unsigned drivers/misc/hdpuftrs/hdpu_cpustate.c
> > --- a/drivers/misc/hdpuftrs/hdpu_cpustate.c~powerpc-sky-cpu-redundant-or-incorrect-tests-on-unsigned
> > +++ a/drivers/misc/hdpuftrs/hdpu_cpustate.c
> > @@ -121,8 +121,6 @@ static ssize_t cpustate_read(struct file
> >  {
> >  	unsigned char data;
> >  
> > -	if (count < 0)
> > -		return -EFAULT;
> >  	if (count == 0)
> >  		return 0;
> >  
> > @@ -137,9 +135,6 @@ static ssize_t cpustate_write(struct fil
> >  {
> >  	unsigned char data;
> >  
> > -	if (count < 0)
> > -		return -EFAULT;
> > -
> >  	if (count == 0)
> >  		return 0;
> >  
> > _
>