linux-kernel - Re: [Outreachy kernel] [PATCH v3 4/4] staging: rtl8723bs: core: Change a controlling expression

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Date:   Sun, 11 Apr 2021 12:08:56 +0200
From:   "Fabio M. De Francesco" <fmdefrancesco@...il.com>
To:     Julia Lawall <julia.lawall@...ia.fr>
Cc:     Julia Lawall <julia.lawall@...ia.fr>,
        Greg KH <gregkh@...uxfoundation.org>,
        outreachy-kernel@...glegroups.com, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [Outreachy kernel] [PATCH v3 4/4] staging: rtl8723bs: core: Change a controlling expression

On Sunday, April 11, 2021 11:51:32 AM CEST Julia Lawall wrote:
> On Sun, 11 Apr 2021, Fabio M. De Francesco wrote:
> > On Sunday, April 11, 2021 11:26:41 AM CEST Julia Lawall wrote:
> > > On Sun, 11 Apr 2021, Fabio M. De Francesco wrote:
> > > > Change a controlling expression within an 'if' statement: don't
> > > > compare
> > > > with 'true'.
> > > > 
> > > > Signed-off-by: Fabio M. De Francesco <fmdefrancesco@...il.com>
> > > > ---
> > > > 
> > > > Changes from v2: Rewrite subject in patch 0/4; remove a patch from
> > > > the
> > > > series because it had already been applied (rtl8723bs: core: Remove
> > > > an
> > > > unused variable). Changes from v1: Fix a typo in subject of patch
> > > > 1/5,
> > > > add patch 5/5.>
> > > > 
> > > >  drivers/staging/rtl8723bs/core/rtw_cmd.c | 2 +-
> > > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > > 
> > > > diff --git a/drivers/staging/rtl8723bs/core/rtw_cmd.c
> > > > b/drivers/staging/rtl8723bs/core/rtw_cmd.c index
> > > > 32079e0f71d5..600366cb1aeb 100644
> > > > --- a/drivers/staging/rtl8723bs/core/rtw_cmd.c
> > > > +++ b/drivers/staging/rtl8723bs/core/rtw_cmd.c
> > > > @@ -1507,7 +1507,7 @@ static void rtw_lps_change_dtim_hdl(struct
> > > > adapter *padapter, u8 dtim)>
> > > > 
> > > >  	if (pwrpriv->dtim != dtim)
> > > >  	
> > > >  		pwrpriv->dtim = dtim;
> > > > 
> > > > -	if ((pwrpriv->fw_current_in_ps_mode == true) && (pwrpriv-
> > >
> > >pwr_mode >
> > >
> > > > PS_MODE_ACTIVE)) { +	if ((pwrpriv->fw_current_in_ps_mode) &&
> > > > (pwrpriv->pwr_mode > PS_MODE_ACTIVE)) {
> > > 
> > > The parentheses in the left argument of && can be dropped as well.
> > 
> > What about the parentheses of the right argument? I'm not sure: does
> > '>'
> > have precedence over '&&'? Doesn't it?
> 
> On the right they are not actually needed either:
>
So, I remembered well :)
> 
> https://en.cppreference.com/w/c/language/operator_precedence
> 
Very nice table. Thanks for the link.
>
> But you could look around in the code and see what people typically do.
> Perhaps one might find the parentheses more clear when there is a binary
> operator.  But when there is no binary operator, they could be more
> confusing than useful.
>
When I look around in the code I see a lot of unnecessary parentheses. 
What people typically do is not always the right thing. I prefer to remove 
parentheses where they are redundant.

Thanks for your kind help,

Fabio
>
> julia
> 
> > Thanks,
> > 
> > Fabio
> > 
> > > julia
> > > 
> > > >  		u8 ps_mode = pwrpriv->pwr_mode;
> > > >  		
> > > >  		rtw_hal_set_hwreg(padapter, HW_VAR_H2C_FW_PWRMODE,
> > 
> > (u8
> > 
> > > >  		*)(&ps_mode));
> > > > 
> > > > --
> > > > 2.31.1
> > > > 
> > > > --
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> > > > discussion
> > > > on the web visit
> > > > https://groups.google.com/d/msgid/outreachy-kernel/20210411082908.3
> > > > 187
> > > > 6-5-fmdefrancesco%40gmail.com.