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Subject[PATCH v5 2/3] driver-core: record error on bus registration
Date
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 <flo@geekplace.eu>
---

Notes:
- Also record ENOMEM error code.

drivers/base/bus.c | 6 +++++-
include/linux/device.h | 1 +
2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index ef6183306b40..5814ecb07648 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)
+ if (!priv) {
+ bus->bus_register_error = -ENOMEM;
return -ENOMEM;
+ }

priv->bus = bus;
bus->p = priv;
@@ -915,6 +918,7 @@ 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
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