If bus_register() fails on a driver then record the error code so that it can be inspected later on.
Signed-off-by: Florian Schmaus <f...@geekplace.eu> --- drivers/base/bus.c | 2 ++ include/linux/device.h | 1 + 2 files changed, 3 insertions(+) diff --git a/drivers/base/bus.c b/drivers/base/bus.c index ef6183306b40..dce677dddba4 100644 --- a/drivers/base/bus.c +++ b/drivers/base/bus.c @@ -152,6 +152,7 @@ static void bus_release(struct kobject *kobj) kfree(priv); bus->p = NULL; + bus->bus_register_error = 0; } static struct kobj_type bus_ktype = { @@ -915,6 +916,7 @@ int bus_register(struct bus_type *bus) out: kfree(bus->p); bus->p = NULL; + bus->bus_register_error = retval; return retval; } EXPORT_SYMBOL_GPL(bus_register); diff --git a/include/linux/device.h b/include/linux/device.h index 0059b99e1f25..5b1f3c08bebe 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -135,6 +135,7 @@ struct bus_type { const struct iommu_ops *iommu_ops; struct subsys_private *p; + int bus_register_error; struct lock_class_key lock_key; bool force_dma; -- 2.16.1