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signals: check_kill_permission: remove tasklist_lock

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Now that task_session() can't return a false NULL, check_kill_permission()
doesn't need tasklist_lock.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: 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 2008-04-30 00:53:02 -07:00 committed by Linus Torvalds
parent 2e2ba22ea4
commit 193191035a
1 changed files with 0 additions and 2 deletions
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2
kernel/signal.c
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@ -551,9 +551,7 @@ static int check_kill_permission(int sig, struct siginfo *info,
!capable(CAP_KILL)) {
switch (sig) {
case SIGCONT:
read_lock(&tasklist_lock);
sid = task_session(t);
read_unlock(&tasklist_lock);
/*
* We don't return the error if sid == NULL. The
* task was unhashed, the caller must notice this.