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Check NULL pointer.

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This commit is contained in:
David Xu 2007-12-17 08:09:37 +00:00
parent baa15be0ea
commit 7fab871d8c
1 changed files with 10 additions and 1 deletions
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11
sys/kern/kern_umtx.c
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@ -1407,8 +1407,17 @@ umtx_pi_adjust_locked(struct thread *td, u_char oldpri)
void
umtx_pi_adjust(struct thread *td, u_char oldpri)
{
struct umtx_q *uq;
struct umtx_pi *pi;
uq = td->td_umtxq;
mtx_lock_spin(&umtx_lock);
umtx_pi_adjust_locked(td, oldpri);
/*
* Pick up the lock that td is blocked on.
*/
pi = uq->uq_pi_blocked;
if (pi != NULL)
umtx_pi_adjust_locked(td, oldpri);
mtx_unlock_spin(&umtx_lock);
}