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keyctl_session_to_parent(): use thread_group_empty() to check singlethreadness 

No functional changes.

keyctl_session_to_parent() is the only user of signal->count which needs
the correct value.  Change it to use thread_group_empty() instead, this
must be strictly equivalent under tasklist, and imho looks better.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: David Howells <dhowells@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Acked-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Nesterov 2010-05-26 14:43:23 -07:00 committed by Linus Torvalds
parent 5089a97680
commit dd98acf747
1 changed files with 1 additions and 1 deletions
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2
security/keys/keyctl.c
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@ -1269,7 +1269,7 @@ long keyctl_session_to_parent(void)
goto not_permitted;
/* the parent must be single threaded */
if (atomic_read(&parent->signal->count) != 1)
if (!thread_group_empty(parent))
goto not_permitted;
/* the parent and the child must have different session keyrings or