linux-kernel - Re: [PATCH v1] drivers: usb: Removes use of assignment in if condition

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Message-ID: <20230816034313.GA57824@atom0118>
Date:   Wed, 16 Aug 2023 09:13:13 +0530
From:   Atul Kumar Pant <atulpant.linux@...il.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     richard.leitner@...ux.dev, wsa+renesas@...g-engineering.com,
        mhocko@...e.com, surenb@...gle.com, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, shuah@...nel.org
Subject: Re: [PATCH v1] drivers: usb: Removes use of assignment in if
 condition

On Tue, Aug 15, 2023 at 11:07:02PM +0200, Greg KH wrote:
> On Wed, Aug 16, 2023 at 02:11:41AM +0530, Atul Kumar Pant wrote:
> > This patch fixes following checkpatch.pl issue:
> > ERROR: do not use assignment in if condition
> > 
> > Signed-off-by: Atul Kumar Pant <atulpant.linux@...il.com>
> > ---
> >  drivers/usb/core/devio.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
> > index e501a03d6c70..56899fed6bd4 100644
> > --- a/drivers/usb/core/devio.c
> > +++ b/drivers/usb/core/devio.c
> > @@ -2333,9 +2333,10 @@ static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
> >  		}
> >  	}
> >  
> > +	intf = usb_ifnum_to_if(ps->dev, ctl->ifno);
> >  	if (ps->dev->state != USB_STATE_CONFIGURED)
> >  		retval = -EHOSTUNREACH;
> > -	else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
> > +	else if (!intf)
> 
> Did you mean to change the logic here by doing the calculation always?
> Does that change functionality?
> 
	Now the calculation of interface will be done always, which can be
	redundant. But this would not change the functionality.

> The existing code is fine, running checkpatch on code outside of
> drivers/staging/ or on new patches you are writing, is generally
> discouraged as the code usually is older than checkpatch is :)
> 
> thanks,
> 
> greg k-h