linux-kernel - Re: [PATCH] media: uvcvideo: fix build error in uvc_ctrl_cleanup

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Message-ID: <CACaw+exN2qHSPpEmZBNBvXCkrzVUb_VCW7YfYYYaaLzNoOSebg@mail.gmail.com>
Date: Mon, 30 Jun 2025 16:33:15 -0300
From: Desnes Nunes <desnesn@...hat.com>
To: Ricardo Ribalda <ribalda@...omium.org>
Cc: laurent.pinchart@...asonboard.com, hansg@...nel.org, 
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, 
	stable@...r.kernel.org
Subject: Re: [PATCH] media: uvcvideo: fix build error in uvc_ctrl_cleanup_fh

Hello Ricardo,

I triggered this build error while working in an older codebase that
uses C89 due to legacy support reasons.
Indeed - will focus on submitting C11 compatible fixes even when
working on older codebases.

Thanks for the review Ricardo,


On Mon, Jun 30, 2025 at 12:16 PM Ricardo Ribalda <ribalda@...omium.org> wrote:
>
> Hi Desdes
>
> How did you trigger this build warning? I believe we use C11
>
> https://www.kernel.org/doc/html/latest/process/programming-language.html
>
>
> Regards!
>
> On Mon, 30 Jun 2025 at 17:07, Desnes Nunes <desnesn@...hat.com> wrote:
> >
> > This fixes the following compilation failure: "error: ‘for’ loop
> > initial declarations are only allowed in C99 or C11 mode"
> >
> > Cc: stable@...r.kernel.org
> > Fixes: 221cd51efe45 ("media: uvcvideo: Remove dangling pointers")
> > Signed-off-by: Desnes Nunes <desnesn@...hat.com>
> > ---
> >  drivers/media/usb/uvc/uvc_ctrl.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
> > index 44b6513c5264..532615d8484b 100644
> > --- a/drivers/media/usb/uvc/uvc_ctrl.c
> > +++ b/drivers/media/usb/uvc/uvc_ctrl.c
> > @@ -3260,7 +3260,7 @@ int uvc_ctrl_init_device(struct uvc_device *dev)
> >  void uvc_ctrl_cleanup_fh(struct uvc_fh *handle)
> >  {
> >         struct uvc_entity *entity;
> > -       int i;
> > +       unsigned int i;
> >
> >         guard(mutex)(&handle->chain->ctrl_mutex);
> >
> > @@ -3268,7 +3268,7 @@ void uvc_ctrl_cleanup_fh(struct uvc_fh *handle)
> >                 return;
> >
> >         list_for_each_entry(entity, &handle->chain->dev->entities, list) {
> > -               for (unsigned int i = 0; i < entity->ncontrols; ++i) {
> > +               for (i = 0; i < entity->ncontrols; ++i) {
> >                         if (entity->controls[i].handle != handle)
> >                                 continue;
> >                         uvc_ctrl_set_handle(handle, &entity->controls[i], NULL);
> > --
> > 2.49.0
> >
> >
>
>
> --
> Ricardo Ribalda
>


-- 
Desnes Nunes