aboutsummaryrefslogtreecommitdiffstats
path: root/fs/proc/generic.c
diff options
context:
space:
mode:
authorAlexey Dobriyan <adobriyan@gmail.com>2008-07-25 01:48:29 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-25 10:53:44 -0700
commit881adb85358309ea9c6f707394002719982ec607 (patch)
treee4ffc2f6ca6013bab97bdb77b80e98b46a8d01e1 /fs/proc/generic.c
parent6e644c3126149b65460610fe5a00d8a162092abe (diff)
proc: always do ->release
Current two-stage scheme of removing PDE emphasizes one bug in proc: open rmmod remove_proc_entry close ->release won't be called because ->proc_fops were cleared. In simple cases it's small memory leak. For every ->open, ->release has to be done. List of openers is introduced which is traversed at remove_proc_entry() if neeeded. Discussions with Al long ago (sigh). Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/proc/generic.c')
-rw-r--r--fs/proc/generic.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index 43e54e86cef..bc0a0dd2d84 100644
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -597,6 +597,7 @@ static struct proc_dir_entry *__proc_create(struct proc_dir_entry **parent,
ent->pde_users = 0;
spin_lock_init(&ent->pde_unload_lock);
ent->pde_unload_completion = NULL;
+ INIT_LIST_HEAD(&ent->pde_openers);
out:
return ent;
}
@@ -789,6 +790,19 @@ void remove_proc_entry(const char *name, struct proc_dir_entry *parent)
spin_unlock(&de->pde_unload_lock);
continue_removing:
+ spin_lock(&de->pde_unload_lock);
+ while (!list_empty(&de->pde_openers)) {
+ struct pde_opener *pdeo;
+
+ pdeo = list_first_entry(&de->pde_openers, struct pde_opener, lh);
+ list_del(&pdeo->lh);
+ spin_unlock(&de->pde_unload_lock);
+ pdeo->release(pdeo->inode, pdeo->file);
+ kfree(pdeo);
+ spin_lock(&de->pde_unload_lock);
+ }
+ spin_unlock(&de->pde_unload_lock);
+
if (S_ISDIR(de->mode))
parent->nlink--;
de->nlink = 0;