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Subject[PATCH -mm 2/3] proc: less special case in xlate code
If valid "parent" is passed to proc_create/remove_proc_entry(), then
name of PDE should consist of only one path component, otherwise creation or
or removal will fail. However, if NULL is passed as parent then create/remove
accept full path as a argument. This is arbitrary restriction -- all
infrastructure is in place.

So, patch allows the following to succeed:

create_proc_entry("foo/bar", 0, pde_baz);
remove_proc_entry("baz/foo/bar", &proc_root);

Also makes the following to behave identically:

create_proc_entry("foo/bar", 0, NULL);
create_proc_entry("foo/bar", 0, &proc_root);

Discrepancy noticed by Den Lunev (IIRC).

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
---

fs/proc/generic.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)

--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -277,8 +277,11 @@ static int xlate_proc_name(const char *name,
int len;
int rtn = 0;

+ de = *ret;
+ if (!de)
+ de = &proc_root;
+
spin_lock(&proc_subdir_lock);
- de = &proc_root;
while (1) {
next = strchr(cp, '/');
if (!next)
@@ -582,7 +585,7 @@ static struct proc_dir_entry *__proc_create(struct proc_dir_entry **parent,
/* make sure name is valid */
if (!name || !strlen(name)) goto out;

- if (!(*parent) && xlate_proc_name(name, parent, &fn) != 0)
+ if (xlate_proc_name(name, parent, &fn) != 0)
goto out;

/* At this point there must not be any '/' characters beyond *fn */
@@ -738,7 +741,7 @@ void remove_proc_entry(const char *name, struct proc_dir_entry *parent)
const char *fn = name;
int len;

- if (!parent && xlate_proc_name(name, &parent, &fn) != 0)
+ if (xlate_proc_name(name, &parent, &fn) != 0)
return;
len = strlen(fn);



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