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drivers/base: check errors

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Add lots of return-value checking.

<pcornelia.huck@de.ibm.com>: fix bus_rescan_devices()]
Cc: "Randy.Dunlap" <rdunlap@xenotime.net>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Andrew Morton 2006-08-14 22:43:20 -07:00 • committed by Greg Kroah-Hartman
parent 370226449c
commit f86db396ff
4 changed files with 104 additions and 50 deletions
Download patch file Download diff file Expand all files Collapse all files

2
drivers/base/base.h
View file

@ -16,7 +16,7 @@ extern int cpu_dev_init(void);
extern int attribute_container_init(void); extern int attribute_container_init(void);
extern int bus_add_device(struct device * dev); extern int bus_add_device(struct device * dev);
extern void bus_attach_device(struct device * dev); extern int bus_attach_device(struct device * dev);
extern void bus_remove_device(struct device * dev); extern void bus_remove_device(struct device * dev);
extern struct bus_type *get_bus(struct bus_type * bus); extern struct bus_type *get_bus(struct bus_type * bus);
extern void put_bus(struct bus_type * bus); extern void put_bus(struct bus_type * bus);

107
drivers/base/bus.c
View file

@ -371,12 +371,20 @@ int bus_add_device(struct device * dev)
if (bus) { if (bus) {
pr_debug("bus %s: add device %s\n", bus->name, dev->bus_id); pr_debug("bus %s: add device %s\n", bus->name, dev->bus_id);
error = device_add_attrs(bus, dev); error = device_add_attrs(bus, dev);
if (!error) { if (error)
sysfs_create_link(&bus->devices.kobj, &dev->kobj, dev->bus_id); goto out;
sysfs_create_link(&dev->kobj, &dev->bus->subsys.kset.kobj, "subsystem"); error = sysfs_create_link(&bus->devices.kobj,
sysfs_create_link(&dev->kobj, &dev->bus->subsys.kset.kobj, "bus"); &dev->kobj, dev->bus_id);
} if (error)
goto out;
error = sysfs_create_link(&dev->kobj,
&dev->bus->subsys.kset.kobj, "subsystem");
if (error)
goto out;
error = sysfs_create_link(&dev->kobj,
&dev->bus->subsys.kset.kobj, "bus");
} }
out:
return error; return error;
} }
@ -386,14 +394,19 @@ int bus_add_device(struct device * dev)
* *
* - Try to attach to driver. * - Try to attach to driver.
*/ */
void bus_attach_device(struct device * dev) int bus_attach_device(struct device * dev)
{ {
struct bus_type * bus = dev->bus; struct bus_type *bus = dev->bus;
int ret = 0;
if (bus) { if (bus) {
device_attach(dev); ret = device_attach(dev);
klist_add_tail(&dev->knode_bus, &bus->klist_devices); if (ret >= 0) {
klist_add_tail(&dev->knode_bus, &bus->klist_devices);
ret = 0;
}
} }
return ret;
} }
/** /**
@ -455,10 +468,17 @@ static void driver_remove_attrs(struct bus_type * bus, struct device_driver * dr
* Thanks to drivers making their tables __devinit, we can't allow manual * Thanks to drivers making their tables __devinit, we can't allow manual
* bind and unbind from userspace unless CONFIG_HOTPLUG is enabled. * bind and unbind from userspace unless CONFIG_HOTPLUG is enabled.
*/ */
static void add_bind_files(struct device_driver *drv) static int __must_check add_bind_files(struct device_driver *drv)
{ {
driver_create_file(drv, &driver_attr_unbind); int ret;
driver_create_file(drv, &driver_attr_bind);
ret = driver_create_file(drv, &driver_attr_unbind);
if (ret == 0) {
ret = driver_create_file(drv, &driver_attr_bind);
if (ret)
driver_remove_file(drv, &driver_attr_unbind);
}
return ret;
} }
static void remove_bind_files(struct device_driver *drv) static void remove_bind_files(struct device_driver *drv)
@ -476,7 +496,7 @@ static inline void remove_bind_files(struct device_driver *drv) {}
* @drv: driver. * @drv: driver.
* *
*/ */
int bus_add_driver(struct device_driver * drv) int bus_add_driver(struct device_driver *drv)
{ {
struct bus_type * bus = get_bus(drv->bus); struct bus_type * bus = get_bus(drv->bus);
int error = 0; int error = 0;
@ -484,27 +504,39 @@ int bus_add_driver(struct device_driver * drv)
if (bus) { if (bus) {
pr_debug("bus %s: add driver %s\n", bus->name, drv->name); pr_debug("bus %s: add driver %s\n", bus->name, drv->name);
error = kobject_set_name(&drv->kobj, "%s", drv->name); error = kobject_set_name(&drv->kobj, "%s", drv->name);
if (error) { if (error)
put_bus(bus); goto out_put_bus;
return error;
}
drv->kobj.kset = &bus->drivers; drv->kobj.kset = &bus->drivers;
if ((error = kobject_register(&drv->kobj))) { if ((error = kobject_register(&drv->kobj)))
put_bus(bus); goto out_put_bus;
return error;
}
driver_attach(drv); error = driver_attach(drv);
if (error)
goto out_unregister;
klist_add_tail(&drv->knode_bus, &bus->klist_drivers); klist_add_tail(&drv->knode_bus, &bus->klist_drivers);
module_add_driver(drv->owner, drv); module_add_driver(drv->owner, drv);
driver_add_attrs(bus, drv); error = driver_add_attrs(bus, drv);
add_bind_files(drv); if (error) {
/* How the hell do we get out of this pickle? Give up */
printk(KERN_ERR "%s: driver_add_attrs(%s) failed\n",
__FUNCTION__, drv->name);
}
error = add_bind_files(drv);
if (error) {
/* Ditto */
printk(KERN_ERR "%s: add_bind_files(%s) failed\n",
__FUNCTION__, drv->name);
}
} }
return error; return error;
out_unregister:
kobject_unregister(&drv->kobj);
out_put_bus:
put_bus(bus);
return error;
} }
/** /**
* bus_remove_driver - delete driver from bus's knowledge. * bus_remove_driver - delete driver from bus's knowledge.
* @drv: driver. * @drv: driver.
@ -530,16 +562,21 @@ void bus_remove_driver(struct device_driver * drv)
/* Helper for bus_rescan_devices's iter */ /* Helper for bus_rescan_devices's iter */
static int bus_rescan_devices_helper(struct device *dev, void *data) static int __must_check bus_rescan_devices_helper(struct device *dev,
void *data)
{ {
int ret = 0;
if (!dev->driver) { if (!dev->driver) {
if (dev->parent) /* Needed for USB */ if (dev->parent) /* Needed for USB */
down(&dev->parent->sem); down(&dev->parent->sem);
device_attach(dev); ret = device_attach(dev);
if (dev->parent) if (dev->parent)
up(&dev->parent->sem); up(&dev->parent->sem);
if (ret > 0)
ret = 0;
} }
return 0; return ret < 0 ? ret : 0;
} }
/** /**
@ -550,9 +587,9 @@ static int bus_rescan_devices_helper(struct device *dev, void *data)
* attached and rescan it against existing drivers to see if it matches * attached and rescan it against existing drivers to see if it matches
* any by calling device_attach() for the unbound devices. * any by calling device_attach() for the unbound devices.
*/ */
void bus_rescan_devices(struct bus_type * bus) int bus_rescan_devices(struct bus_type * bus)
{ {
bus_for_each_dev(bus, NULL, NULL, bus_rescan_devices_helper); return bus_for_each_dev(bus, NULL, NULL, bus_rescan_devices_helper);
} }
/** /**
@ -564,7 +601,7 @@ void bus_rescan_devices(struct bus_type * bus)
* to use if probing criteria changed during a devices lifetime and * to use if probing criteria changed during a devices lifetime and
* driver attachment should change accordingly. * driver attachment should change accordingly.
*/ */
void device_reprobe(struct device *dev) int device_reprobe(struct device *dev)
{ {
if (dev->driver) { if (dev->driver) {
if (dev->parent) /* Needed for USB */ if (dev->parent) /* Needed for USB */
@ -573,14 +610,14 @@ void device_reprobe(struct device *dev)
if (dev->parent) if (dev->parent)
up(&dev->parent->sem); up(&dev->parent->sem);
} }
return bus_rescan_devices_helper(dev, NULL);
bus_rescan_devices_helper(dev, NULL);
} }
EXPORT_SYMBOL_GPL(device_reprobe); EXPORT_SYMBOL_GPL(device_reprobe);
struct bus_type * get_bus(struct bus_type * bus) struct bus_type *get_bus(struct bus_type *bus)
{ {
return bus ? container_of(subsys_get(&bus->subsys), struct bus_type, subsys) : NULL; return bus ? container_of(subsys_get(&bus->subsys),
struct bus_type, subsys) : NULL;
} }
void put_bus(struct bus_type * bus) void put_bus(struct bus_type * bus)

37
drivers/base/dd.c
View file

@ -38,17 +38,29 @@
* *
* This function must be called with @dev->sem held. * This function must be called with @dev->sem held.
*/ */
void device_bind_driver(struct device * dev) int device_bind_driver(struct device *dev)
{ {
if (klist_node_attached(&dev->knode_driver)) int ret;
return;
if (klist_node_attached(&dev->knode_driver)) {
printk(KERN_WARNING "%s: device %s already bound\n",
__FUNCTION__, kobject_name(&dev->kobj));
return 0;
}
pr_debug("bound device '%s' to driver '%s'\n", pr_debug("bound device '%s' to driver '%s'\n",
dev->bus_id, dev->driver->name); dev->bus_id, dev->driver->name);
klist_add_tail(&dev->knode_driver, &dev->driver->klist_devices); klist_add_tail(&dev->knode_driver, &dev->driver->klist_devices);
sysfs_create_link(&dev->driver->kobj, &dev->kobj, ret = sysfs_create_link(&dev->driver->kobj, &dev->kobj,
kobject_name(&dev->kobj)); kobject_name(&dev->kobj));
sysfs_create_link(&dev->kobj, &dev->driver->kobj, "driver"); if (ret == 0) {
ret = sysfs_create_link(&dev->kobj, &dev->driver->kobj,
"driver");
if (ret)
sysfs_remove_link(&dev->driver->kobj,
kobject_name(&dev->kobj));
}
return ret;
} }
/** /**
@ -91,7 +103,11 @@ int driver_probe_device(struct device_driver * drv, struct device * dev)
goto ProbeFailed; goto ProbeFailed;
} }
} }
device_bind_driver(dev); if (device_bind_driver(dev)) {
printk(KERN_ERR "%s: device_bind_driver(%s) failed\n",
__FUNCTION__, dev->bus_id);
/* How does undo a ->probe? We're screwed. */
}
ret = 1; ret = 1;
pr_debug("%s: Bound Device %s to Driver %s\n", pr_debug("%s: Bound Device %s to Driver %s\n",
drv->bus->name, dev->bus_id, drv->name); drv->bus->name, dev->bus_id, drv->name);
@ -139,8 +155,9 @@ int device_attach(struct device * dev)
down(&dev->sem); down(&dev->sem);
if (dev->driver) { if (dev->driver) {
device_bind_driver(dev); ret = device_bind_driver(dev);
ret = 1; if (ret == 0)
ret = 1;
} else } else
ret = bus_for_each_drv(dev->bus, NULL, dev, __device_attach); ret = bus_for_each_drv(dev->bus, NULL, dev, __device_attach);
up(&dev->sem); up(&dev->sem);
@ -182,9 +199,9 @@ static int __driver_attach(struct device * dev, void * data)
* returns 0 and the @dev->driver is set, we've found a * returns 0 and the @dev->driver is set, we've found a
* compatible pair. * compatible pair.
*/ */
void driver_attach(struct device_driver * drv) int driver_attach(struct device_driver * drv)
{ {
bus_for_each_dev(drv->bus, NULL, drv, __driver_attach); return bus_for_each_dev(drv->bus, NULL, drv, __driver_attach);
} }
/** /**

8
include/linux/device.h
View file

@ -62,7 +62,7 @@ struct bus_type {
extern int __must_check bus_register(struct bus_type * bus); extern int __must_check bus_register(struct bus_type * bus);
extern void bus_unregister(struct bus_type * bus); extern void bus_unregister(struct bus_type * bus);
extern void bus_rescan_devices(struct bus_type * bus); extern int __must_check bus_rescan_devices(struct bus_type * bus);
/* iterator helpers for buses */ /* iterator helpers for buses */
@ -397,11 +397,11 @@ extern int device_rename(struct device *dev, char *new_name);
* Manual binding of a device to driver. See drivers/base/bus.c * Manual binding of a device to driver. See drivers/base/bus.c
* for information on use. * for information on use.
*/ */
extern void device_bind_driver(struct device * dev); extern int __must_check device_bind_driver(struct device *dev);
extern void device_release_driver(struct device * dev); extern void device_release_driver(struct device * dev);
extern int __must_check device_attach(struct device * dev); extern int __must_check device_attach(struct device * dev);
extern void driver_attach(struct device_driver * drv); extern int __must_check driver_attach(struct device_driver *drv);
extern void device_reprobe(struct device *dev); extern int __must_check device_reprobe(struct device *dev);
/* /*
* Easy functions for dynamically creating devices on the fly * Easy functions for dynamically creating devices on the fly