linux-kernel - Re: [PATCH 20/20] staging:rtl8192u: Rename OWN

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Message-ID: <20180911214955.GE31239@xux707-tw>
Date:   Tue, 11 Sep 2018 22:49:56 +0100
From:   John Whitmore <johnfwhitmore@...il.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org
Subject: Re: [PATCH 20/20] staging:rtl8192u: Rename OWN - Style

On Mon, Sep 10, 2018 at 05:09:27PM +0200, Greg KH wrote:
> On Sat, Sep 01, 2018 at 12:02:50AM +0100, John Whitmore wrote:
> > Rename the member variable 'OWN' to 'own', this is to comply with the
> > coding standard, where variables are named in lowercase.
> > 
> > This is a simple coding style change which should have no impact on
> > runtime code execution.
> > 
> > Signed-off-by: John Whitmore <johnfwhitmore@...il.com>
> > ---
> >  drivers/staging/rtl8192u/r8192U.h      | 2 +-
> >  drivers/staging/rtl8192u/r8192U_core.c | 2 +-
> >  2 files changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/staging/rtl8192u/r8192U.h b/drivers/staging/rtl8192u/r8192U.h
> > index 68e82b32a88e..f963b664e221 100644
> > --- a/drivers/staging/rtl8192u/r8192U.h
> > +++ b/drivers/staging/rtl8192u/r8192U.h
> > @@ -165,7 +165,7 @@ struct tx_desc_819x_usb {
> >  	u8	last_seg:1;
> >  	u8	first_seg:1;
> >  	u8	linip:1;
> > -	u8	OWN:1;
> > +	u8	own:1;
> >  
> >  	/* DWORD 1 */
> >  	u8	TxFWInfoSize;
> > diff --git a/drivers/staging/rtl8192u/r8192U_core.c b/drivers/staging/rtl8192u/r8192U_core.c
> > index 911d0214b48a..4d0f70ec31ac 100644
> > --- a/drivers/staging/rtl8192u/r8192U_core.c
> > +++ b/drivers/staging/rtl8192u/r8192U_core.c
> > @@ -1558,7 +1558,7 @@ short rtl8192_tx(struct net_device *dev, struct sk_buff *skb)
> >  	/* DWORD 0 */
> >  	tx_desc->first_seg = 1;
> >  	tx_desc->last_seg = 1;
> > -	tx_desc->OWN = 1;
> > +	tx_desc->own = 1;
> 
> Is this another case of a variable being set once and then never used?
> 
> If so, just delete it.
> 
> thanks,
> 
> greg k-h

em, I wasn't sure because that variable's a memeber of the sk_buff * passed
into the funtion. That function should be static to the file and is only
called from function rtl8192_hard_start_xmit() but that's a function
pointer which is sort of exported:

        priv->ieee80211->softmac_hard_start_xmit = rtl8192_hard_start_xmit;

Having said that the 'OWN' member is part of the private data:

	struct tx_desc_819x_usb *tx_desc = (struct tx_desc_819x_usb *)skb->data;

Like I say I wasn't sure so played it safe. I guess it's private data so nobody
outside the driver should be messing with that data, and I'm not sure how
public that function is.

I'll read some, ponder a bit and have another go.

jwhitmore