[PATCH 1/2] stdio: Introduce stdio_valid()

[Nicolas Saenz Julienne <nsaenzjulienne@suse.de>]

On Sat, 2021-01-23 at 19:03 -0700, Simon Glass wrote:
> Hi Nicolas,
> 
> On Wed, 20 Jan 2021 at 07:05, Nicolas Saenz Julienne
> <nsaenzjulienne@suse.de> wrote:
> > 
> > stdio_valid() will confirm that a struct stdio_dev pointer is indeed
> > valid.
> > 
> > Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
> > ---
> > ?common/stdio.c      | 11 +++++++++++
> > ?include/stdio_dev.h |  1 +
> > ?2 files changed, 12 insertions(+)
> > 
> > diff --git a/common/stdio.c b/common/stdio.c
> > index abf9b1e915..69b7d2692d 100644
> > --- a/common/stdio.c
> > +++ b/common/stdio.c
> > @@ -157,6 +157,17 @@ static int stdio_probe_device(const char *name, enum uclass_id id,
> > ????????return 0;
> > ?}
> > 
> > +bool stdio_valid(struct stdio_dev *dev)
> > +{
> > +       struct stdio_dev *sdev;
> > +
> > +       list_for_each_entry(sdev, &devs.list, list)
> > +               if (sdev == dev)
> > +                       return true;
> > +
> > +       return false;
> > +}
> > +
> > ?struct stdio_dev *stdio_get_by_name(const char *name)
> > ?{
> > ????????struct list_head *pos;
> > diff --git a/include/stdio_dev.h b/include/stdio_dev.h
> > index 48871a6a22..f341439b03 100644
> > --- a/include/stdio_dev.h
> > +++ b/include/stdio_dev.h
> > @@ -97,6 +97,7 @@ int stdio_deregister_dev(struct stdio_dev *dev, int force);
> > ?struct list_head *stdio_get_list(void);
> > ?struct stdio_dev *stdio_get_by_name(const char *name);
> > ?struct stdio_dev *stdio_clone(struct stdio_dev *dev);
> > +bool stdio_valid(struct stdio_dev *dev);
> 
> Please add a full function comment and explain what valid means.

As discussed with Andy, this is a workaround that doesn't address the
underlying issue. If it's good enough for the time being I'll be happy to send
a v2.

I'll leave a comment stating that it's something to fix.

Regards,
Nicolas

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