From 5301a77da2da1e4c22573e0e8d394a653b8ad9f9 Mon Sep 17 00:00:00 2001
From: Louis Rilling <Louis.Rilling@kerlabs.com>
Date: Mon, 16 Jun 2008 19:00:59 +0200
Subject: [PATCH] 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>
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