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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
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=174707
1 changed files with 10 additions and 1 deletions
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9
sys/kern/kern_umtx.c
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@ -1407,7 +1407,16 @@ umtx_pi_adjust_locked(struct thread *td, u_char oldpri)
void void
umtx_pi_adjust(struct thread *td, u_char oldpri) 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); mtx_lock_spin(&umtx_lock);
/*
* Pick up the lock that td is blocked on.
*/
pi = uq->uq_pi_blocked;
if (pi != NULL)
umtx_pi_adjust_locked(td, oldpri); umtx_pi_adjust_locked(td, oldpri);
mtx_unlock_spin(&umtx_lock); mtx_unlock_spin(&umtx_lock);
} }