On Mon, Mar 13, 2023 at 07:43:22PM +0100, Rafael J. Wysocki wrote: > On Mon, Mar 13, 2023 at 7:29 PM Greg Kroah-Hartman > <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > > > > Direct access to the struct bus_type dev_root pointer is going away soon > > so replace that with a call to bus_get_dev_root() instead, which is what > > it is there for. > > > > Cc: "Rafael J. Wysocki" <rafael@xxxxxxxxxx> > > Cc: Len Brown <lenb@xxxxxxxxxx> > > Cc: linux-acpi@xxxxxxxxxxxxxxx > > Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> > > --- > > Note, this is a patch that is a prepatory cleanup as part of a larger > > series of patches that is working on resolving some old driver core > > design mistakes. It will build and apply cleanly on top of 6.3-rc2 on > > its own, but I'd prefer if I could take it through my driver-core tree > > so that the driver core changes can be taken through there for 6.4-rc1. > > > > drivers/acpi/acpi_lpit.c | 17 +++++++++++------ > > 1 file changed, 11 insertions(+), 6 deletions(-) > > > > diff --git a/drivers/acpi/acpi_lpit.c b/drivers/acpi/acpi_lpit.c > > index 3843d2576d3f..73b5c4800150 100644 > > --- a/drivers/acpi/acpi_lpit.c > > +++ b/drivers/acpi/acpi_lpit.c > > @@ -98,6 +98,8 @@ EXPORT_SYMBOL_GPL(lpit_read_residency_count_address); > > static void lpit_update_residency(struct lpit_residency_info *info, > > struct acpi_lpit_native *lpit_native) > > { > > + struct device *dev_root = bus_get_dev_root(&cpu_subsys); > > + > > This can return here right away if dev_root is NULL, because it will > not do anything useful in that case anyway. Thanks for the review of these, I'll redo some of them and send out a v2 of them next week. greg k-h