[U-Boot] [PATCH v2 03/15] env: Pass additional parameters to the env lookup function

[Maxime Ripard <maxime.ripard@free-electrons.com>]

On Wed, Jan 17, 2018 at 03:03:40PM -0700, Simon Glass wrote:
> Hi Maxime,
> 
> On 16 January 2018 at 01:16, Maxime Ripard
> <maxime.ripard@free-electrons.com> wrote:
> > In preparation for the multiple environment support, let's introduce two
> > new parameters to the environment driver lookup function: the priority and
> > operation.
> >
> > The operation parameter is meant to identify, obviously, the operation you
> > might want to perform on the environment.
> >
> > The priority is a number passed to identify the environment priority you
> > want to retrieve. The lowest priority parameter (0) will be the primary
> > source.
> >
> > Combining the two parameters allow you to support multiple environments
> > through different priorities, and to change those priorities between read
> > and writes operations.
> >
> > This is especially useful to implement migration mechanisms where you want
> > to always use the same environment first, be it to read or write, while the
> > common case is more likely to use the same environment it has read from to
> > write it to.
> >
> > Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
> > ---
> >  env/env.c             | 135 +++++++++++++++++++++++++++----------------
> >  include/environment.h |   8 +++-
> >  2 files changed, 94 insertions(+), 49 deletions(-)
> >
> > diff --git a/env/env.c b/env/env.c
> > index 97ada5b5a6fd..4dc39b384c1e 100644
> > --- a/env/env.c
> > +++ b/env/env.c
> > @@ -26,8 +26,11 @@ static struct env_driver *_env_driver_lookup(enum env_location loc)
> >         return NULL;
> >  }
> >
> > -static enum env_location env_get_location(void)
> > +static enum env_location env_get_location(enum env_operation op, int prio)
> 
> Please add a function comment, including why @op is needed.

This was done in a later patch (the __weak one), but you're right that
it makes more sense for it to be here.

> 
> >  {
> > +       if (prio >= 1)
> > +               return ENVL_UNKNOWN;
> 
> What is this for? Can you please add a comment?

Done, thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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