On Fri, Jan 28, 2022 at 10:14 AM Dan Williams <[email protected]> wrote: [..] > Here is that put_device() I was expecting, that kfree() earlier was a > double-free it seems. > > Also, I would have expected a devm action to remove this. Something like: > > struct cxl_port *port = to_cxl_port(cxld->dev.parent); > > cxl_device_lock(&port->dev); > if (port->dev.driver) > devm_cxl_add_region(port->uport, cxld, id); > else > rc = -ENXIO; > cxl_device_unlock(&port->dev); > > ...then no matter what you know the region will be unregistered when > the root port goes away.
...actually, the lock and ->dev.driver check here are not needed because this attribute is only registered while the cxl_acpi driver is bound. So, it is safe to assume this is protected as decoder remove synchronizes against active sysfs users.
