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OpenCloudOS-Kernel
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[PATCH] Driver core: class_device_add needs error checks 

class_device_add needs to check the return value of all the setup it
does. It doesn't handle out of memory well. This is not complete, probably
more needs to be done.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Stephen Hemminger 2006-04-26 09:53:14 -07:00 committed by Greg Kroah-Hartman
parent 3dda4e373c
commit b7fe4a60f3
1 changed files with 54 additions and 18 deletions
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72
drivers/base/class.c
View File

@ -535,18 +535,22 @@ int class_device_add(struct class_device *class_dev)
return -EINVAL;
if (!strlen(class_dev->class_id))
goto register_done;
goto out1;
parent_class = class_get(class_dev->class);
if (!parent_class)
goto register_done;
goto out1;
parent_class_dev = class_device_get(class_dev->parent);
pr_debug("CLASS: registering class device: ID = '%s'\n",
class_dev->class_id);
/* first, register with generic layer. */
kobject_set_name(&class_dev->kobj, "%s", class_dev->class_id);
error = kobject_set_name(&class_dev->kobj, "%s", class_dev->class_id);
if (error)
goto out2;
if (parent_class_dev)
class_dev->kobj.parent = &parent_class_dev->kobj;
else
@ -554,41 +558,56 @@ int class_device_add(struct class_device *class_dev)
error = kobject_add(&class_dev->kobj);
if (error)
goto register_done;
goto out2;
/* add the needed attributes to this device */
class_dev->uevent_attr.attr.name = "uevent";
class_dev->uevent_attr.attr.mode = S_IWUSR;
class_dev->uevent_attr.attr.owner = parent_class->owner;
class_dev->uevent_attr.store = store_uevent;
class_device_create_file(class_dev, &class_dev->uevent_attr);
error = class_device_create_file(class_dev, &class_dev->uevent_attr);
if (error)
goto out3;
if (MAJOR(class_dev->devt)) {
struct class_device_attribute *attr;
attr = kzalloc(sizeof(*attr), GFP_KERNEL);
if (!attr) {
error = -ENOMEM;
kobject_del(&class_dev->kobj);
goto register_done;
goto out4;
}
attr->attr.name = "dev";
attr->attr.mode = S_IRUGO;
attr->attr.owner = parent_class->owner;
attr->show = show_dev;
class_device_create_file(class_dev, attr);
error = class_device_create_file(class_dev, attr);
if (error) {
kfree(attr);
goto out4;
}
class_dev->devt_attr = attr;
}
class_device_add_attrs(class_dev);
error = class_device_add_attrs(class_dev);
if (error)
goto out5;
if (class_dev->dev) {
class_name = make_class_name(class_dev);
sysfs_create_link(&class_dev->kobj,
&class_dev->dev->kobj, "device");
sysfs_create_link(&class_dev->dev->kobj, &class_dev->kobj,
class_name);
error = sysfs_create_link(&class_dev->kobj,
&class_dev->dev->kobj, "device");
if (error)
goto out6;
error = sysfs_create_link(&class_dev->dev->kobj, &class_dev->kobj,
class_name);
if (error)
goto out7;
}
class_device_add_groups(class_dev);
error = class_device_add_groups(class_dev);
if (error)
goto out8;
kobject_uevent(&class_dev->kobj, KOBJ_ADD);
@ -601,11 +620,28 @@ int class_device_add(struct class_device *class_dev)
}
up(&parent_class->sem);
register_done:
if (error) {
class_put(parent_class);
goto out1;
out8:
if (class_dev->dev)
sysfs_remove_link(&class_dev->kobj, class_name);
out7:
if (class_dev->dev)
sysfs_remove_link(&class_dev->kobj, "device");
out6:
class_device_remove_attrs(class_dev);
out5:
if (class_dev->devt_attr)
class_device_remove_file(class_dev, class_dev->devt_attr);
out4:
class_device_remove_file(class_dev, &class_dev->uevent_attr);
out3:
kobject_del(&class_dev->kobj);
out2:
if(parent_class_dev)
class_device_put(parent_class_dev);
}
class_put(parent_class);
out1:
class_device_put(class_dev);
kfree(class_name);
return error;