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(re)register_binfmt returns with -EBUSY

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When a binary format is unregistered and re-registered, register_binfmt
fails with -EBUSY.  The reason is that unregister_binfmt does not set
fmt->next to NULL, and seeing (fmt->next != NULL), register_binfmt fails
with -EBUSY.

One can find his way around by explicitly setting fmt->next to NULL after
unregistering, but that is kind of unclean (one should better be using only
the interfaces, and not the interal members, isn't it?)

Attached one-liner can fix it.

Signed-off-by: Kalash Nainwal <kalash.nainwal@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
kalash nainwal 2007-05-08 00:28:31 -07:00 committed by Linus Torvalds
parent 0f95b7fc83
commit 98701d1b0f
1 changed files with 1 additions and 0 deletions
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1
fs/exec.c
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@ -100,6 +100,7 @@ int unregister_binfmt(struct linux_binfmt * fmt)
while (*tmp) {
if (fmt == *tmp) {
*tmp = fmt->next;
fmt->next = NULL;
write_unlock(&binfmt_lock);
return 0;
}