[PATCH v5 3/3] driver-core: print bus registration error value

[Florian Schmaus]

If driver_register() is called with an device driver which previously
called bus_register() but failed, then print out the bus_register()
error code.

Signed-off-by: Florian Schmaus <f...@geekplace.eu>
---

Notes:
    - Do not split long strings across lines.

 drivers/base/driver.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/base/driver.c b/drivers/base/driver.c
index 16b81d1c6cb7..a1fe7cb43c7e 100644
--- a/drivers/base/driver.c
+++ b/drivers/base/driver.c
@@ -149,8 +149,14 @@ int driver_register(struct device_driver *drv)
        struct device_driver *other;
 
        if (!drv->bus->p) {
-               pr_err("Driver '%s' was unable to register with bus_type '%s' 
because it was not initialized.\n",
-                          drv->name, drv->bus->name);
+               if (drv->bus->bus_register_error) {
+                       pr_err("Driver '%s' was unable to register with 
bus_type '%s' because of error: %d.\n",
+                                  drv->name, drv->bus->name,
+                                  drv->bus->bus_register_error);
+               } else {
+                       pr_err("Driver '%s' was unable to register with 
bus_type '%s' because it was not initialized.\n",
+                                  drv->name, drv->bus->name);
+               }
                return -EINVAL;
        }
 
-- 
2.16.1