Re: [PATCH] firmware: remove request_firmware_into_buf()

From: Luis R. Rodriguez
Date: Wed Jul 12 2017 - 19:44:51 EST

On Tue, Jun 27, 2017 at 10:37:11AM -0700, Bjorn Andersson wrote:
> On Mon 26 Jun 23:52 PDT 2017, Greg Kroah-Hartman wrote:
> > Why would we keep it if there is no in-tree user for it? If you want it
> > sometime in the future, great, we can revert the deletion then, but
> > keeping it around for nothing isn't ok, you know that :)
> >
> Of course I know that :)
> I did put a patch in the tubes for this yesterday [1], it's late for
> v4.13, but I would be happy to see the API stay and we would have a user
> in v4.14 (and tick this off Qualcomm's "required" list).
> [1]


What have you decided to do?

Also what is the threshold for number of drivers to use a new feature for us to
add it? Note that there is a bundle of features queued up now and as per your
own preference it would seem you want a new API call for each new feature...

Can you clarify that is what you wish for?
Are you *certain* you want to take this approach?

Note that this patch alone was not sufficient to revert all all the stuff for
request_firmware_into_buf(), there was another patch which added the option to
make caching optional, but it was only used internally. Folks already have a
use case for that though *and* existing upstream drivers already have a use
case for that -- the iwlwifi driver is such a case, as they do their own
caching for its driver.

There are similar features in the pipeline which are minor variations to requests
such as optional requests -- do you *really* expect a new API call then to be
created for minor variations of each major call for say optional requests or
requests for without caching?

I had to think about all these things, so now I ask you to also consider this as well.

I ask how many drivers are needed as users for a feature as I think its important
to be fair for the other features in the pipeline which I did start reviewing
and *do* consider sensible to add support for. This was an example feature which
went in with 0 users at all for a while... and now it seems we only have *one*
user still...