sysfs: Remove support for tagged directories with untagged members.

Now that /sys/class/net/bonding_masters is implemented as a tagged sysfs
file we can remove support for untagged files in tagged directories.

This change removes any ambiguity of what a NULL namespace value
means.  A NULL namespace parameter after this patch means
that we are talking about an untagged sysfs dirent.

This makes the sysfs code much less prone to mistakes when during
maintenance.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 3 insertions, 5 deletions

diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index ea9120a830d8..352d26d98c0a 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -543,7 +543,7 @@ struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd,
         struct sysfs_dirent *sd;
 
         for (sd = parent_sd->s_dir.children; sd; sd = sd->s_sibling) {
-                if (ns && sd->s_ns && (sd->s_ns != ns))
+                if (sd->s_ns != ns)
                         continue;
                 if (!strcmp(sd->s_name, name))
                         return sd;
@@ -885,7 +885,7 @@ static struct sysfs_dirent *sysfs_dir_pos(const void *ns,
                 while (pos && (ino > pos->s_ino))
                         pos = pos->s_sibling;
         }
-        while (pos && pos->s_ns && pos->s_ns != ns)
+        while (pos && pos->s_ns != ns)
                 pos = pos->s_sibling;
         return pos;
 }
@@ -896,7 +896,7 @@ static struct sysfs_dirent *sysfs_dir_next_pos(const void *ns,
         pos = sysfs_dir_pos(ns, parent_sd, ino, pos);
         if (pos)
                 pos = pos->s_sibling;
-        while (pos && pos->s_ns && pos->s_ns != ns)
+        while (pos && pos->s_ns != ns)
                 pos = pos->s_sibling;
         return pos;
 }
diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c
index e3f091a81c72..527f0cca66ee 100644
--- a/fs/sysfs/inode.c
+++ b/fs/sysfs/inode.c
@@ -336,8 +336,6 @@ int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const void *ns, const cha
         sysfs_addrm_start(&acxt, dir_sd);
 
         sd = sysfs_find_dirent(dir_sd, ns, name);
-        if (sd && (sd->s_ns != ns))
-                sd = NULL;
         if (sd)
                 sysfs_remove_one(&acxt, sd);