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proc: detect duplicate names on registration

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Print a warning if PDE is registered with a name which already exists in
target directory.

Bug report and a simple fix can be found here:
http://bugzilla.kernel.org/show_bug.cgi?id=8798

[\n fixlet and no undescriptive variable usage --adobriyan]
[akpm@linux-foundation.org: make printk comprehensible]
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Zhang Rui 2008-02-08 04:18:29 -08:00 committed by Linus Torvalds
parent fd2cbe4888
commit 94413d8807
1 changed files with 10 additions and 0 deletions
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10
fs/proc/generic.c
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@ -521,6 +521,7 @@ static const struct inode_operations proc_dir_inode_operations = {
static int proc_register(struct proc_dir_entry * dir, struct proc_dir_entry * dp)
{
unsigned int i;
struct proc_dir_entry *tmp;
i = get_inode_number();
if (i == 0)
@ -544,6 +545,15 @@ static int proc_register(struct proc_dir_entry * dir, struct proc_dir_entry * dp
}
spin_lock(&proc_subdir_lock);
for (tmp = dir->subdir; tmp; tmp = tmp->next)
if (strcmp(tmp->name, dp->name) == 0) {
printk(KERN_WARNING "proc_dir_entry '%s' already "
"registered\n", dp->name);
dump_stack();
break;
}
dp->next = dir->subdir;
dp->parent = dir;
dir->subdir = dp;