forked from luck/tmp_suning_uos_patched
Driver core: fix class glue dir cleanup logic
We should remove the glue directory between the class and the bus device _after_ we sent out the 'remove' event for the device, otherwise the parent relationship is no longer valid, and composing the path with deleted sysfs entries will not work. Cc: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Kay Sievers
Greg Kroah-Hartman
parent
ef2c51746d
commit
da231fd5d1
@ -18,7 +18,7 @@
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#include <linux/string.h>
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#include <linux/kdev_t.h>
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#include <linux/notifier.h>
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#include <linux/genhd.h>
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#include <asm/semaphore.h>
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#include "base.h"
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@ -538,22 +538,20 @@ void device_initialize(struct device *dev)
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}
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#ifdef CONFIG_SYSFS_DEPRECATED
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static struct kobject * get_device_parent(struct device *dev,
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struct device *parent)
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static struct kobject *get_device_parent(struct device *dev,
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struct device *parent)
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{
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/*
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* Set the parent to the class, not the parent device
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* for topmost devices in class hierarchy.
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* This keeps sysfs from having a symlink to make old
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* udevs happy
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*/
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/* class devices without a parent live in /sys/class/<classname>/ */
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if (dev->class && (!parent || parent->class != dev->class))
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return &dev->class->subsys.kobj;
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/* all other devices keep their parent */
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else if (parent)
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return &parent->kobj;
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return NULL;
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}
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static inline void cleanup_device_parent(struct device *dev) {}
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#else
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static struct kobject *virtual_device_parent(struct device *dev)
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{
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@ -566,8 +564,8 @@ static struct kobject *virtual_device_parent(struct device *dev)
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return virtual_dir;
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}
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static struct kobject * get_device_parent(struct device *dev,
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struct device *parent)
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static struct kobject *get_device_parent(struct device *dev,
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struct device *parent)
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{
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int retval;
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@ -618,6 +616,34 @@ static struct kobject * get_device_parent(struct device *dev,
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return &parent->kobj;
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return NULL;
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}
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static void cleanup_device_parent(struct device *dev)
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{
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struct device *d;
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int other = 0;
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if (!dev->class)
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return;
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/* see if we live in a parent class directory */
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if (dev->kobj.parent->kset != &dev->class->class_dirs)
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return;
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/* if we are the last child of our class, delete the directory */
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down(&dev->class->sem);
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list_for_each_entry(d, &dev->class->devices, node) {
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if (d == dev)
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continue;
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if (d->kobj.parent == dev->kobj.parent) {
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other = 1;
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break;
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}
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}
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if (!other)
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kobject_del(dev->kobj.parent);
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kobject_put(dev->kobj.parent);
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up(&dev->class->sem);
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}
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#endif
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static int setup_parent(struct device *dev, struct device *parent)
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@ -637,65 +663,74 @@ static int device_add_class_symlinks(struct device *dev)
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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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#ifdef CONFIG_SYSFS_DEPRECATED
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/* stacked class devices need a symlink in the class directory */
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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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if (dev->parent) {
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#ifdef CONFIG_SYSFS_DEPRECATED
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{
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struct device *parent = dev->parent;
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char *class_name;
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struct device *parent = dev->parent;
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char *class_name;
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/*
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* In old sysfs stacked class devices had 'device'
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* link pointing to real device instead of parent
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*/
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while (parent->class && !parent->bus && parent->parent)
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parent = parent->parent;
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/*
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* stacked class devices have the 'device' link
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* pointing to the bus device instead of the parent
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*/
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while (parent->class && !parent->bus && parent->parent)
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parent = parent->parent;
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error = sysfs_create_link(&dev->kobj,
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&parent->kobj,
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"device");
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if (error)
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goto out_busid;
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error = sysfs_create_link(&dev->kobj,
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&parent->kobj,
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"device");
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if (error)
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goto out_busid;
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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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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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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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return 0;
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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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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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#else
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/* link in the class directory pointing to the device */
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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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if (dev->parent) {
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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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#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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sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id);
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#endif
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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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@ -706,8 +741,9 @@ 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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if (dev->parent) {
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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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@ -715,11 +751,18 @@ static void device_remove_class_symlinks(struct device *dev)
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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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#else
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if (dev->parent)
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sysfs_remove_link(&dev->kobj, "device");
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sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id);
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#endif
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sysfs_remove_link(&dev->kobj, "subsystem");
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}
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@ -830,26 +873,6 @@ int device_add(struct device *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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if (dev->class) {
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sysfs_remove_link(&dev->kobj, "subsystem");
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/* If this is not a "fake" compatible device, remove 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_remove_link(&dev->class->subsys.kobj,
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dev->bus_id);
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if (parent) {
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#ifdef CONFIG_SYSFS_DEPRECATED
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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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sysfs_remove_link(&dev->parent->kobj,
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class_name);
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kfree(class_name);
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#endif
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sysfs_remove_link(&dev->kobj, "device");
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}
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}
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ueventattrError:
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device_remove_file(dev, &uevent_attr);
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attrError:
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@ -932,23 +955,7 @@ void device_del(struct device * dev)
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if (MAJOR(dev->devt))
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device_remove_file(dev, &devt_attr);
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if (dev->class) {
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sysfs_remove_link(&dev->kobj, "subsystem");
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/* If this is not a "fake" compatible device, remove 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_remove_link(&dev->class->subsys.kobj,
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dev->bus_id);
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if (parent) {
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#ifdef CONFIG_SYSFS_DEPRECATED
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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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sysfs_remove_link(&dev->parent->kobj,
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class_name);
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kfree(class_name);
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#endif
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sysfs_remove_link(&dev->kobj, "device");
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}
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device_remove_class_symlinks(dev);
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down(&dev->class->sem);
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/* notify any interfaces that the device is now gone */
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@ -958,31 +965,6 @@ void device_del(struct device * dev)
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/* remove the device from the class list */
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list_del_init(&dev->node);
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up(&dev->class->sem);
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/* If we live in a parent class-directory, unreference it */
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if (dev->kobj.parent->kset == &dev->class->class_dirs) {
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struct device *d;
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int other = 0;
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/*
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* if we are the last child of our class, delete
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* our class-directory at this parent
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*/
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down(&dev->class->sem);
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list_for_each_entry(d, &dev->class->devices, node) {
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if (d == dev)
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continue;
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if (d->kobj.parent == dev->kobj.parent) {
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other = 1;
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break;
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}
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}
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if (!other)
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kobject_del(dev->kobj.parent);
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kobject_put(dev->kobj.parent);
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up(&dev->class->sem);
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}
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}
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device_remove_file(dev, &uevent_attr);
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device_remove_attrs(dev);
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@ -1004,9 +986,9 @@ void device_del(struct device * dev)
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blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
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BUS_NOTIFY_DEL_DEVICE, dev);
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kobject_uevent(&dev->kobj, KOBJ_REMOVE);
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cleanup_device_parent(dev);
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kobject_del(&dev->kobj);
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if (parent)
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put_device(parent);
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put_device(parent);
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}
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/**
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