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Subject[patch 06/20] sysfs: sysfs_remove_dir() needs to invalidate the dentry
-stable review patch.  If anyone has any objections, please let us know.

------------------
When calling sysfs_remove_dir() don't allow any further sysfs functions
to work for this kobject anymore. This fixes a nasty USB cdc-acm oops
on disconnect.
Many thanks to Bob Copeland and Paul Fulghum for taking the time to
track this down.

Cc: Bob Copeland <email@bobcopeland.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Cc: Maneesh Soni <maneesh@in.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
fs/sysfs/dir.c | 1 +
fs/sysfs/inode.c | 6 +++++-
2 files changed, 6 insertions(+), 1 deletion(-)
641e6f30a095f3752ed84fd9d279382f5d3ef4c1
--- linux-2.6.16.orig/fs/sysfs/dir.c
+++ linux-2.6.16/fs/sysfs/dir.c
@@ -302,6 +302,7 @@ void sysfs_remove_dir(struct kobject * k
* Drop reference from dget() on entrance.
*/
dput(dentry);
+ kobj->dentry = NULL;
}

int sysfs_rename_dir(struct kobject * kobj, const char *new_name)
--- linux-2.6.16.orig/fs/sysfs/inode.c
+++ linux-2.6.16/fs/sysfs/inode.c
@@ -227,12 +227,16 @@ void sysfs_drop_dentry(struct sysfs_dire
void sysfs_hash_and_remove(struct dentry * dir, const char * name)
{
struct sysfs_dirent * sd;
- struct sysfs_dirent * parent_sd = dir->d_fsdata;
+ struct sysfs_dirent * parent_sd;
+
+ if (!dir)
+ return;

if (dir->d_inode == NULL)
/* no inode means this hasn't been made visible yet */
return;

+ parent_sd = dir->d_fsdata;
mutex_lock(&dir->d_inode->i_mutex);
list_for_each_entry(sd, &parent_sd->s_children, s_sibling) {
if (!sd->s_element)
--
-
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