futex: Use futex_top_waiter() in lookup_pi_state()
No point in open coding the same function again. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Darren Hart <darren@dvhart.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Davidlohr Bueso <davidlohr@hp.com> Cc: Kees Cook <kees@outflux.net> Cc: wad@chromium.org Link: http://lkml.kernel.org/r/20140611204237.092947239@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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@ -796,21 +796,20 @@ static int
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lookup_pi_state(u32 uval, struct futex_hash_bucket *hb,
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union futex_key *key, struct futex_pi_state **ps)
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{
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struct futex_q *match = futex_top_waiter(hb, key);
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struct futex_pi_state *pi_state = NULL;
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struct futex_q *this, *next;
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struct task_struct *p;
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pid_t pid = uval & FUTEX_TID_MASK;
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plist_for_each_entry_safe(this, next, &hb->chain, list) {
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if (match_futex(&this->key, key)) {
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if (match) {
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/*
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* Sanity check the waiter before increasing
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* the refcount and attaching to it.
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* Sanity check the waiter before increasing the
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* refcount and attaching to it.
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*/
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pi_state = this->pi_state;
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pi_state = match->pi_state;
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/*
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* Userspace might have messed up non-PI and
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* PI futexes [3]
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* Userspace might have messed up non-PI and PI
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* futexes [3]
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*/
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if (unlikely(!pi_state))
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return -EINVAL;
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@ -877,7 +876,6 @@ lookup_pi_state(u32 uval, struct futex_hash_bucket *hb,
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*ps = pi_state;
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return 0;
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}
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}
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/*
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* We are the first waiter - try to look up the real owner and attach
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