linux-kernel - Re: [PATCH][V2] drivers: thermal: processor_thermal

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Date:   Mon, 19 Aug 2019 14:32:43 +0800
From:   Zhang Rui <rui.zhang@...el.com>
To:     Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Colin King <colin.king@...onical.com>,
        Eduardo Valentin <edubezval@...il.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        linux-pm@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][V2] drivers: thermal: processor_thermal_device: fix
 missing bitwise-or operators

On Mon, 2019-07-29 at 14:09 -0700, Srinivas Pandruvada wrote:
> On Mon, 2019-07-29 at 13:03 +0100, Colin King wrote:
> > From: Colin Ian King <colin.king@...onical.com>
> > 
> > The variable val is having the top 8 bits cleared and then the
> > variable is being
> > re-assinged and setting just the top 8 bits.  I believe the
> > intention
> > was bitwise-or
> > in the top 8 bits.  Fix this by replacing the = operators with &=
> > and
> > > = instead.
> > 
> > Addresses-Coverity: ("Unused value")
> > Fixes: b0c74b08517e ("drivers: thermal: processor_thermal_device:
> > Export sysfs inteface for TCC offset")
> > Signed-off-by: Colin Ian King <colin.king@...onical.com>
> 
> Reviewed-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com
> >

Hi, Colin,

thanks for the fix, as b0c74b08517e ("drivers: thermal:
processor_thermal_device: Export sysfs inteface for TCC offset") has
not been shipped in upstream yet, I will fold this fix into the
original patch directly.

thanks,
rui
> 
> > ---
> > 
> > V2: Add in &= operator missing from V1. Doh.
> > 
> > ---
> >  .../thermal/intel/int340x_thermal/processor_thermal_device.c  | 4
> > ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git
> > a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
> > b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
> > index 6f6ac6a8e82d..97333fc4be42 100644
> > ---
> > a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
> > +++
> > b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
> > @@ -163,8 +163,8 @@ static int tcc_offset_update(int tcc)
> >  	if (err)
> >  		return err;
> >  
> > -	val = ~GENMASK_ULL(31, 24);
> > -	val = (tcc & 0xff) << 24;
> > +	val &= ~GENMASK_ULL(31, 24);
> > +	val |= (tcc & 0xff) << 24;
> >  
> >  	err = wrmsrl_safe(MSR_IA32_TEMPERATURE_TARGET, val);
> >  	if (err)
> 
>