From: Maneesh Soni <maneesh@in.ibm.com>

o This patch uses the sysfs_dirent based tree while removing sysfs files
  and directories. This avoids holding dcache_lock by not using dentry
  based vfs tree. Thus simplyfying the removal logic in sysfs.

o It uses two helper routines sysfs_get_name(), to get the name for
  sysfs element and sysfs_drop_dentry() to delete the dentry given a
  sysfs_dirent.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>