commit 5301a77da2da1e4c22573e0e8d394a653b8ad9f9
author Louis Rilling <Louis.Rilling@kerlabs.com> Mon Jun 16 19:00:59 2008 +0200
committer Mark Fasheh <mfasheh@suse.com> Mon Jul 14 13:57:16 2008 -0700
tree c2a6186510c3a4502d923cf3f5d445fa821cb277
parent 6f61076406251626be39651d114fac412b1e0c39

configfs: Protect configfs_dirent s_links list mutations

Symlinks to a config_item are listed under its configfs_dirent s_links, but the
list mutations are not protected by any common lock.

This patch uses the configfs_dirent_lock spinlock to add the necessary
protection.

Note: we should also protect the list_empty() test in configfs_detach_prep() but
1/ the lock should not be released immediately because nothing would prevent the
list from being filled after a successful list_empty() test, making the problem
tricky,
2/ this will be solved by the rmdir() vs rename() deadlock bugfix.

Signed-off-by: Louis Rilling <Louis.Rilling@kerlabs.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>