linux-kernel - Re: [Outreachy kernel] [PATCH v2] staging: rtl8723bs: Remove useless led_blink

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Message-ID: <3820176.uhjs84E3K9@linux.local>
Date:   Wed, 14 Apr 2021 20:24:58 +0200
From:   "Fabio M. De Francesco" <fmdefrancesco@...il.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     outreachy-kernel@...glegroups.com, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org, Matthew Wilcox <willy@...radead.org>,
        Julia Lawall <julia.lawall@...ia.fr>
Subject: Re: [Outreachy kernel] [PATCH v2] staging: rtl8723bs: Remove useless led_blink_hdl()

On Wednesday, April 14, 2021 8:05:59 PM CEST Fabio M. De Francesco wrote:
> On Wednesday, April 14, 2021 7:57:03 PM CEST Greg Kroah-Hartman wrote:
> > On Wed, Apr 14, 2021 at 08:48:09PM +0300, Dan Carpenter wrote:
> > > On Wed, Apr 14, 2021 at 07:00:41PM +0200, Greg Kroah-Hartman wrote:
> > > > On Wed, Apr 14, 2021 at 06:26:14PM +0200, Fabio M. De Francesco
> 
> wrote:
> > > > > Removed useless led_blink_hdl() prototype and definition. In
> > > > > wlancmds[]
> > > > > the slot #60 is now set to NULL using the macro
> > > > > GEN_MLME_EXT_HANDLER. This change has not unwanted side effects
> > > > > because the code in rtw_cmd.c checks if the function pointer is
> > > > > valid before using it.
> > > > > 
> > > > > Reported-by: Julia Lawall <julia.lawall@...ia.fr>
> > > > > Suggested-by: Dan Carpenter <dan.carpenter@...cle.com>
> > > > > Signed-off-by: Fabio M. De Francesco <fmdefrancesco@...il.com>
> > > > > ---
> > > > > 
> > > > > Changes since v1: Corrected a bad solution to this issue that
> > > > > made
> > > > > use of an unnecessary dummy function.
> > > > > 
> > > > >  drivers/staging/rtl8723bs/core/rtw_cmd.c         | 2 +-
> > > > >  drivers/staging/rtl8723bs/core/rtw_mlme_ext.c    | 9 ---------
> > > > >  drivers/staging/rtl8723bs/include/rtw_mlme_ext.h | 1 -
> > > > >  3 files changed, 1 insertion(+), 11 deletions(-)
> > > > > 
> > > > > diff --git a/drivers/staging/rtl8723bs/core/rtw_cmd.c
> > > > > b/drivers/staging/rtl8723bs/core/rtw_cmd.c index
> > > > > 0297fbad7bce..f82dbd4f4c3d 100644
> > > > > --- a/drivers/staging/rtl8723bs/core/rtw_cmd.c
> > > > > +++ b/drivers/staging/rtl8723bs/core/rtw_cmd.c
> > > > > @@ -150,7 +150,7 @@ static struct cmd_hdl wlancmds[] = {
> > > > > 
> > > > >  	GEN_MLME_EXT_HANDLER(0, h2c_msg_hdl) /*58*/
> > > > >  	GEN_MLME_EXT_HANDLER(sizeof(struct SetChannelPlan_param),
> > > > >  	set_chplan_hdl) /*59*/> > >
> > > > > 
> > > > > -	GEN_MLME_EXT_HANDLER(sizeof(struct LedBlink_param),
> > > > > led_blink_hdl) /*60*/ +	GEN_MLME_EXT_HANDLER(0, NULL) /
*60*/
> > > > 
> > > > Better, but you really do not need to keep this here, right? 
> > > > Remove
> > > > the
> > > > "led blink command" entirely, you didn't do that here.
> > > 
> > > No, this is right.  We have to put a NULL function pointer in the
> > > array
> > > or the indexing will be off.  But Fabio is correct that the struct
> > > type should be removed.
> > 
> > The indexing can be off, just remove the other place where the
> > "command"
> > is in the index and all is good as rebuilding will fix it.  These are
> > not external "values" we have to keep stable.
> > 
> > This has been done for other drivers exactly like this, there are loads
> > of "odd" commands in there that should not be.
> > 
> > thanks,
> > 
> > greg k-h
> 
> I'm not sure if this task is so close related to deserve a v3 or if I
> should make a new v1 patch with a different "Subject".
> 
> Thanks,
> 
> Fabio
I'll make a v3 series, submitting this patch again (as 1/2) and adding the 
above-mentioned changes in another one (as 2/2).

Fabio