Re: mtd: Use mtd device name instead of mtd->name when registering nvmem device

[Christophe Kerello]

On 11/25/19 5:05 PM, Steve deRosier wrote:
> On Fri, Nov 22, 2019 at 9:04 AM Christophe Kerello
> <christophe.kerello@xxxxxx> wrote:
> > MTD currently allows to have same partition name on different devices.
> > Since nvmen device registration has been added, it is not more possible
> > to have same partition name on different devices. We get following
> > logs:
> > sysfs: cannot create duplicate filename XXX
> > Failed to register NVMEM device
> >
> > To avoid such issue, the proposed patch uses the mtd device name instead of
> > the partition name.
> ...
> > diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
> > index 5fac435..559b693 100644
> > --- a/drivers/mtd/mtdcore.c
> > +++ b/drivers/mtd/mtdcore.c
> > @@ -551,7 +551,7 @@ static int mtd_nvmem_add(struct mtd_info *mtd)
> >
> >          config.id = -1;
> >          config.dev = &mtd->dev;
> > -       config.name = mtd->name;
> > +       config.name = dev_name(&mtd->dev);
> >          config.owner = THIS_MODULE;
> >          config.reg_read = mtd_nvmem_reg_read;
> >          config.size = mtd->size;
>
> This would be a breaking change for anyone that depended on
> `config.name = mtd->name` behavior. Obviously, if they were using
> multiple devs with the same partition name as you were, they'd have
> already been broken, but I suspect if a lot of people were doing that
> we'd have heard about that before now.

Hi Steve,

I understand your concern. So the recommendation is to have unique 
partition names.

Regards,
Christophe Kerello.

> - Steve