Re: [PATCH] PM / runtime: Fixup reference counting of device link suppliers at probe

[Rafael J. Wysocki]

On Fri, May 18, 2018 at 10:48 AM, Ulf Hansson <ulf.hansson@xxxxxxxxxx> wrote:
> In the driver core, before it invokes really_probe() it runtime resumes the
> suppliers for the device via calling pm_runtime_get_suppliers(), which also
> increases the runtime PM usage count for each of the available supplier.
>
> This makes sense, as to be able to allow the consumer device to be probed
> by its driver. However, if the driver decides to add a new supplier link
> during ->probe(), hence updating the list of suppliers,

Do any of the existing drivers do that?

> the following call to pm_runtime_put_suppliers(), invoked after really_probe()
> in the driver core, we get into trouble.