linux-kernel - Re: [PATCH v3] USB: serial: usb_wwan: replace DTR/RTS magic numbers with macros

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Date:   Sun, 24 Jul 2022 15:50:52 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Johan Hovold <johan@...nel.org>
Cc:     Yan Xinyu <sdlyyxy@...t.edu.cn>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] USB: serial: usb_wwan: replace DTR/RTS magic numbers
 with macros

On Sun, Jul 24, 2022 at 11:10:22AM +0200, Johan Hovold wrote:
> On Fri, Jul 22, 2022 at 04:50:40PM +0800, Yan Xinyu wrote:
> > The usb_wwan_send_setup function generates DTR/RTS signals in compliance
> > with CDC ACM standard. This patch changes magic numbers in this function
> > to equivalent macros.
> > 
> > Signed-off-by: Yan Xinyu <sdlyyxy@...t.edu.cn>
> > ---
> > v1->v2:
> >  * Fix Signed-off-by name.
> > v2->v3:
> >  * Use already defined ACM_CTRL_DTR and ACM_CTRL_RTS in drivers/usb/class/cdc-acm.h
> > ---
> >  drivers/usb/serial/usb_wwan.c | 11 +++++++----
> >  1 file changed, 7 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/usb/serial/usb_wwan.c b/drivers/usb/serial/usb_wwan.c
> > index dab38b63eaf7..5c8303bd3676 100644
> > --- a/drivers/usb/serial/usb_wwan.c
> > +++ b/drivers/usb/serial/usb_wwan.c
> > @@ -29,8 +29,10 @@
> >  #include <linux/bitops.h>
> >  #include <linux/uaccess.h>
> >  #include <linux/usb.h>
> > +#include <linux/usb/cdc.h>
> >  #include <linux/usb/serial.h>
> >  #include <linux/serial.h>
> > +#include "../class/cdc-acm.h"
> 
> If we are to use common defines, these would need to be added to
> linux/usb/cdc.h first (parts of which are exposed to user space).
> 
> Note that we already have at least three copies of these defines in the
> tree.
> 
> I'm fine with adding another copy for now and not have to deal with with
> naming and cross driver updates. What do you think, Greg?

I think Yan should write a patch series to unify these and make it
right, instead of just papering over it all.  Also this "../" stuff in a
#include directive is not ok, I wouldn't recommend this change be taken
as-is.

thanks,

greg k-h