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> --- Notes: Also record ENOMEM error drivers/base/bus.c | 9 +++++++-- include/linux/device.h | 1 + 2 files changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/base/bus.c b/drivers/base/bus.c index ef6183306b40..6e27741eb03e 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 = { @@ -848,8 +849,10 @@ int bus_register(struct bus_type *bus) struct lock_class_key *key = &bus->lock_key; priv = kzalloc(sizeof(struct subsys_private), GFP_KERNEL); - if (!priv) - return -ENOMEM; + if (!priv) { + retval = -ENOMEM; + goto bus_alloc_fail; + } priv->bus = bus; bus->p = priv; @@ -914,7 +917,9 @@ int bus_register(struct bus_type *bus) kset_unregister(&bus->p->subsys); out: kfree(bus->p); +bus_alloc_fail: 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