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authorCornelia Huck <cornelia.huck@de.ibm.com>2007-02-05 16:15:26 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2007-04-27 10:57:29 -0700
commitc6a46696f97ff260a4ecce5e287f8de4b9d7fe14 (patch)
tree335de50c9868cd575f535677e430677d33cbaaa1 /drivers/base
parenteed40d3ad2ba652c08422d62a5ff6f62ac0be16d (diff)
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driver core: don't fail attaching the device if it cannot be bound
Don't fail bus_attach_device() if the device cannot be bound. If dev->driver has been specified, reset it to NULL if device_bind_driver() failed and add the device as an unbound device. As a result, bus_attach_device() now cannot fail, and we can remove some checking from device_add(). Also remove an unneeded check in bus_rescan_devices_helper(). Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/base.h2
-rw-r--r--drivers/base/bus.c11
-rw-r--r--drivers/base/core.c5
-rw-r--r--drivers/base/dd.c6
4 files changed, 11 insertions, 13 deletions
diff --git a/drivers/base/base.h b/drivers/base/base.h
index de7e144..d597f26 100644
--- a/drivers/base/base.h
+++ b/drivers/base/base.h
@@ -16,7 +16,7 @@ extern int cpu_dev_init(void);
extern int attribute_container_init(void);
extern int bus_add_device(struct device * dev);
-extern int bus_attach_device(struct device * dev);
+extern void bus_attach_device(struct device * dev);
extern void bus_remove_device(struct device * dev);
extern struct bus_type *get_bus(struct bus_type * bus);
extern void put_bus(struct bus_type * bus);
diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 9df2e6d..20b6dc8 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -447,7 +447,7 @@ out_put:
* - Add device to bus's list of devices.
* - Try to attach to driver.
*/
-int bus_attach_device(struct device * dev)
+void bus_attach_device(struct device * dev)
{
struct bus_type *bus = dev->bus;
int ret = 0;
@@ -456,13 +456,12 @@ int bus_attach_device(struct device * dev)
dev->is_registered = 1;
if (bus->drivers_autoprobe)
ret = device_attach(dev);
- if (ret >= 0) {
+ WARN_ON(ret < 0);
+ if (ret >= 0)
klist_add_tail(&dev->knode_bus, &bus->klist_devices);
- ret = 0;
- } else
+ else
dev->is_registered = 0;
}
- return ret;
}
/**
@@ -669,8 +668,6 @@ static int __must_check bus_rescan_devices_helper(struct device *dev,
ret = device_attach(dev);
if (dev->parent)
up(&dev->parent->sem);
- if (ret > 0)
- ret = 0;
}
return ret < 0 ? ret : 0;
}
diff --git a/drivers/base/core.c b/drivers/base/core.c
index bffb69e..be6aeb4 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -677,8 +677,7 @@ int device_add(struct device *dev)
goto BusError;
if (!dev->uevent_suppress)
kobject_uevent(&dev->kobj, KOBJ_ADD);
- if ((error = bus_attach_device(dev)))
- goto AttachError;
+ bus_attach_device(dev);
if (parent)
klist_add_tail(&dev->knode_parent, &parent->klist_children);
@@ -697,8 +696,6 @@ int device_add(struct device *dev)
kfree(class_name);
put_device(dev);
return error;
- AttachError:
- bus_remove_device(dev);
BusError:
device_pm_remove(dev);
PMError:
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 616b4bb..18dba8e 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -232,7 +232,7 @@ static int device_probe_drivers(void *data)
*
* Returns 1 if the device was bound to a driver;
* 0 if no matching device was found or multithreaded probing is done;
- * error code otherwise.
+ * -ENODEV if the device is not registered.
*
* When called for a USB interface, @dev->parent->sem must be held.
*/
@@ -246,6 +246,10 @@ int device_attach(struct device * dev)
ret = device_bind_driver(dev);
if (ret == 0)
ret = 1;
+ else {
+ dev->driver = NULL;
+ ret = 0;
+ }
} else {
if (dev->bus->multithread_probe)
probe_task = kthread_run(device_probe_drivers, dev,
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