On Thu, 2020-10-22 at 21:46 +0300, Andy Shevchenko wrote:

On Thu, Oct 22, 2020 at 9:06 PM Nicolas Saenz Julienne
[off-list ref] wrote:

quoted

When unbinding the firmware device we need to make sure it has no
consumers left. Otherwise we'd leave them with a firmware handle
pointing at freed memory.

Keep a reference count of all consumers and make sure they all finished
unbinding before we do.

Wait, if it's a device, why do we need all these?
get_device() / put_device() along with module_get() / module_put()
should be sufficient, no?

Could you expand here a little, I do see how I could use get_device()'s
reference count. But it seems to me I'd be digging way too deep into kobj in
order to get the functionality I need.

If you meant to say that it should be automatically taken care by the platform
bus, just FYI we're using 'simple-mfd' in DT. Where firmware supplier is the
parent and all consumers are children.

Regards,
Nicolas