Re: [PATCH 5/9] staging: vc04_services: Do not pass NULL to vchiq_log_error()

Laurent Pinchart
2023-11-23T13:41:22Z

On Thu, Nov 23, 2023 at 12:57:14PM +0000, Greg Kroah-Hartman wrote:
> On Tue, Nov 07, 2023 at 06:01:58PM +0530, Umang Jain wrote:
> > Hi Laurent,
> >
> > On 11/7/23 5:55 PM, Laurent Pinchart wrote:
> > > Hi Umang,
> > >
> > > Thank you for the patch.
> > >
> > > On Tue, Nov 07, 2023 at 04:51:52AM -0500, Umang Jain wrote:
> > > > vchiq_add_connected_callback() logs using vchiq_log_error() macro,
> > > > but passes NULL instead of a struct device pointer. Fix it.
> > > >
> > > > vchiq_add_connected_callback() is not used anywhere in the vc04_services
> > > > as of now. It will be used when we add new drivers(VC shared memory and
> > > > bcm2835-isp), hence it kept as it is for now.
> > > >
> > > > Fixes: 1d8915cf8899 ("staging: vc04: Convert vchiq_log_error() to use dynamic debug")
> > > > Signed-off-by: Umang Jain <umang.jain@ideasonboard.com>
> > > > ---
> > > > .../vc04_services/interface/vchiq_arm/vchiq_connected.c | 4 ++--
> > > > .../vc04_services/interface/vchiq_arm/vchiq_connected.h | 4 +++-
> > > > 2 files changed, 5 insertions(+), 3 deletions(-)
> > > >
> > > > diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_connected.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_connected.c
> > > > index b3928bd8c9c6..21f9fa1a1713 100644
> > > > --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_connected.c
> > > > +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_connected.c
> > > > @@ -27,7 +27,7 @@ static void connected_init(void)
> > > > * be made immediately, otherwise it will be deferred until
> > > > * vchiq_call_connected_callbacks is called.
> > > > */
> > > > -void vchiq_add_connected_callback(void (*callback)(void))
> > > > +void vchiq_add_connected_callback(struct vchiq_device *device, void (*callback)(void))
> > > You're changing the prototype of the function, but the patch doesn't
> > > update any user. If the function is unused, it looks like you can drop
> > > it instead. Looking at the rest of the vchiq_connected.c file, I think
> > > you can actually drop the whole file.
> >
> > I mentioned in the commit message of this patch. There will be users in the
> > near future.
>
> We write code for today, not any potential users in the future. If it's
> not used now, let's delete it and then when we need it in the future,
> you can add it back then.

What was the near future on November the 7th is now the present :-)
Umang has sent a new version of the ISP driver that uses this API. I
think this kind of near future is fine, and we routinely do the same
during review when large feature are split across multiple series
(whether those series are merged together or independently is another
question of course).

--
Regards,

Laurent Pinchart