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Message-ID: <20061127103516.212ce75f@gondolin.boeblingen.de.ibm.com>
Date: Mon, 27 Nov 2006 10:35:16 +0100
From: Cornelia Huck <cornelia.huck@...ibm.com>
To: Greg K-H <greg@...ah.com>
Cc: Andrew Morton <akpm@...l.org>,
linux-kernel <linux-kernel@...r.kernel.org>
Subject: [Patch 7/7] driver core: Don't fail attaching the device if it
cannot be bound.
From: Cornelia Huck <cornelia.huck@...ibm.com>
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@...ibm.com>
---
drivers/base/base.h | 2 +-
drivers/base/bus.c | 13 +++++--------
drivers/base/core.c | 5 +----
drivers/base/dd.c | 6 +++++-
4 files changed, 12 insertions(+), 14 deletions(-)
--- linux-2.6-CH.orig/drivers/base/dd.c
+++ linux-2.6-CH/drivers/base/dd.c
@@ -230,7 +230,7 @@ static int device_probe_drivers(void *da
*
* 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.
*/
@@ -244,6 +244,10 @@ 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,
--- linux-2.6-CH.orig/drivers/base/core.c
+++ linux-2.6-CH/drivers/base/core.c
@@ -595,8 +595,7 @@ int device_add(struct device *dev)
if ((error = bus_add_device(dev)))
goto BusError;
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);
@@ -614,8 +613,6 @@ int device_add(struct device *dev)
Done:
put_device(dev);
return error;
- AttachError:
- bus_remove_device(dev);
BusError:
device_pm_remove(dev);
PMError:
--- linux-2.6-CH.orig/drivers/base/base.h
+++ linux-2.6-CH/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);
--- linux-2.6-CH.orig/drivers/base/bus.c
+++ linux-2.6-CH/drivers/base/bus.c
@@ -420,21 +420,20 @@ 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;
+ int ret;
if (bus) {
dev->is_registered = 1;
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;
}
/**
@@ -607,8 +606,6 @@ static int __must_check bus_rescan_devic
ret = device_attach(dev);
if (dev->parent)
up(&dev->parent->sem);
- if (ret > 0)
- ret = 0;
}
return ret < 0 ? ret : 0;
}
-
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