Driver core: check return code of sysfs_create_link()
Check for return value of sysfs_create_link() in device_add() and device_rename(). Add helper functions device_add_class_symlinks() and device_remove_class_symlinks() to make the code easier to read. [akpm@linux-foundation.org: fix unused var warnings] Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Acked-by: Jeff Garzik <jeff@garzik.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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@ -660,6 +660,82 @@ static int setup_parent(struct device *dev, struct device *parent)
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return 0;
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}
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static int device_add_class_symlinks(struct device *dev)
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{
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int error;
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if (!dev->class)
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return 0;
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error = sysfs_create_link(&dev->kobj, &dev->class->subsys.kobj,
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"subsystem");
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if (error)
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goto out;
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/*
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* If this is not a "fake" compatible device, then create the
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* symlink from the class to the device.
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*/
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if (dev->kobj.parent != &dev->class->subsys.kobj) {
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error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj,
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dev->bus_id);
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if (error)
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goto out_subsys;
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}
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/* only bus-device parents get a "device"-link */
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if (dev->parent && dev->parent->bus) {
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error = sysfs_create_link(&dev->kobj, &dev->parent->kobj,
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"device");
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if (error)
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goto out_busid;
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#ifdef CONFIG_SYSFS_DEPRECATED
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{
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char * class_name = make_class_name(dev->class->name,
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&dev->kobj);
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if (class_name)
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error = sysfs_create_link(&dev->parent->kobj,
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&dev->kobj, class_name);
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kfree(class_name);
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if (error)
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goto out_device;
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}
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#endif
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}
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return 0;
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#ifdef CONFIG_SYSFS_DEPRECATED
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out_device:
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if (dev->parent)
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sysfs_remove_link(&dev->kobj, "device");
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#endif
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out_busid:
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if (dev->kobj.parent != &dev->class->subsys.kobj)
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sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id);
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out_subsys:
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sysfs_remove_link(&dev->kobj, "subsystem");
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out:
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return error;
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}
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static void device_remove_class_symlinks(struct device *dev)
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{
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if (!dev->class)
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return;
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if (dev->parent) {
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#ifdef CONFIG_SYSFS_DEPRECATED
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char *class_name;
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class_name = make_class_name(dev->class->name, &dev->kobj);
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if (class_name) {
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sysfs_remove_link(&dev->parent->kobj, class_name);
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kfree(class_name);
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}
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#endif
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sysfs_remove_link(&dev->kobj, "device");
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}
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if (dev->kobj.parent != &dev->class->subsys.kobj)
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sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id);
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sysfs_remove_link(&dev->kobj, "subsystem");
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}
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/**
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* device_add - add device to device hierarchy.
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* @dev: device.
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@ -674,7 +750,6 @@ static int setup_parent(struct device *dev, struct device *parent)
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int device_add(struct device *dev)
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{
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struct device *parent = NULL;
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char *class_name = NULL;
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struct class_interface *class_intf;
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int error = -EINVAL;
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@ -714,27 +789,9 @@ int device_add(struct device *dev)
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goto ueventattrError;
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}
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if (dev->class) {
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sysfs_create_link(&dev->kobj, &dev->class->subsys.kobj,
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"subsystem");
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/* If this is not a "fake" compatible device, then create the
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* symlink from the class to the device. */
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if (dev->kobj.parent != &dev->class->subsys.kobj)
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sysfs_create_link(&dev->class->subsys.kobj,
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&dev->kobj, dev->bus_id);
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if (parent) {
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sysfs_create_link(&dev->kobj, &dev->parent->kobj,
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"device");
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#ifdef CONFIG_SYSFS_DEPRECATED
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class_name = make_class_name(dev->class->name,
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&dev->kobj);
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if (class_name)
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sysfs_create_link(&dev->parent->kobj,
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&dev->kobj, class_name);
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#endif
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}
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}
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error = device_add_class_symlinks(dev);
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if (error)
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goto SymlinkError;
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error = device_add_attrs(dev);
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if (error)
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goto AttrsError;
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@ -761,7 +818,6 @@ int device_add(struct device *dev)
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up(&dev->class->sem);
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}
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Done:
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kfree(class_name);
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put_device(dev);
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return error;
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BusError:
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@ -772,6 +828,8 @@ int device_add(struct device *dev)
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BUS_NOTIFY_DEL_DEVICE, dev);
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device_remove_attrs(dev);
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AttrsError:
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device_remove_class_symlinks(dev);
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SymlinkError:
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if (MAJOR(dev->devt))
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device_remove_file(dev, &devt_attr);
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@ -1156,7 +1214,7 @@ int device_rename(struct device *dev, char *new_name)
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{
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char *old_class_name = NULL;
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char *new_class_name = NULL;
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char *old_symlink_name = NULL;
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char *old_device_name = NULL;
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int error;
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dev = get_device(dev);
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@ -1170,42 +1228,49 @@ int device_rename(struct device *dev, char *new_name)
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old_class_name = make_class_name(dev->class->name, &dev->kobj);
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#endif
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if (dev->class) {
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old_symlink_name = kmalloc(BUS_ID_SIZE, GFP_KERNEL);
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if (!old_symlink_name) {
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error = -ENOMEM;
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goto out_free_old_class;
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}
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strlcpy(old_symlink_name, dev->bus_id, BUS_ID_SIZE);
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old_device_name = kmalloc(BUS_ID_SIZE, GFP_KERNEL);
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if (!old_device_name) {
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error = -ENOMEM;
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goto out;
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}
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strlcpy(old_device_name, dev->bus_id, BUS_ID_SIZE);
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strlcpy(dev->bus_id, new_name, BUS_ID_SIZE);
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error = kobject_rename(&dev->kobj, new_name);
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if (error) {
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strlcpy(dev->bus_id, old_device_name, BUS_ID_SIZE);
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goto out;
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}
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#ifdef CONFIG_SYSFS_DEPRECATED
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if (old_class_name) {
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new_class_name = make_class_name(dev->class->name, &dev->kobj);
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if (new_class_name) {
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sysfs_create_link(&dev->parent->kobj, &dev->kobj,
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new_class_name);
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error = sysfs_create_link(&dev->parent->kobj,
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&dev->kobj, new_class_name);
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if (error)
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goto out;
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sysfs_remove_link(&dev->parent->kobj, old_class_name);
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}
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}
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#endif
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if (dev->class) {
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sysfs_remove_link(&dev->class->subsys.kobj,
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old_symlink_name);
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sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj,
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dev->bus_id);
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sysfs_remove_link(&dev->class->subsys.kobj, old_device_name);
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error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj,
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dev->bus_id);
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if (error) {
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/* Uh... how to unravel this if restoring can fail? */
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dev_err(dev, "%s: sysfs_create_symlink failed (%d)\n",
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__FUNCTION__, error);
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}
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}
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out:
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put_device(dev);
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kfree(new_class_name);
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kfree(old_symlink_name);
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out_free_old_class:
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kfree(old_class_name);
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kfree(old_device_name);
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return error;
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}
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