[PATCH] driver core: fix error handling in bus_add_device

The error handling in bus_add_device() and device_attach() is simply
non-existing. This patch propagates any error from device_attach to
the upper layers to allow for a proper recovery.

From: Hannes Reinecke <hare@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 4eb19525e064fbf7c7f24df87a84108dac6064a1..43722af90bddf2e01343bc24de33e25668952237 100644 (file)
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -270,11 +270,14 @@ int bus_add_device(struct device * dev)
 
        if (bus) {
                pr_debug("bus %s: add device %s\n", bus->name, dev->bus_id);
-               device_attach(dev);
+               error = device_attach(dev);
                klist_add_tail(&bus->klist_devices, &dev->knode_bus);
-               device_add_attrs(bus, dev);
-               sysfs_create_link(&bus->devices.kobj, &dev->kobj, dev->bus_id);
-               sysfs_create_link(&dev->kobj, &dev->bus->subsys.kset.kobj, "bus");
+               if (error >= 0)
+                       error = device_add_attrs(bus, dev);
+               if (!error) {
+                       sysfs_create_link(&bus->devices.kobj, &dev->kobj, dev->bus_id);
+                       sysfs_create_link(&dev->kobj, &dev->bus->subsys.kset.kobj, "bus");
+               }
        }
        return error;
 }
@@ -394,7 +397,7 @@ static int bus_rescan_devices_helper(struct device *dev, void *data)
 {
        int *count = data;
 
-       if (!dev->driver && device_attach(dev))
+       if (!dev->driver && (device_attach(dev) > 0))
                (*count)++;
 
        return 0;

diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index eab2030c506d0d3751a0d5a107aa4c32e7eda5e2..6db3a789c54f2f92eb292f09cac74d3fa3382ab9 100644 (file)
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -119,7 +119,8 @@ static int __device_attach(struct device_driver * drv, void * data)
  *     driver_probe_device() for each pair. If a compatible
  *     pair is found, break out and return.
  *
- *     Returns 1 if the device was bound to a driver; 0 otherwise.
+ *     Returns 1 if the device was bound to a driver;
+ *     0 if no matching device was found; error code otherwise.
  */
 int device_attach(struct device * dev)
 {