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| author | Roland Dreier <rolandd@cisco.com> | 2009-09-05 20:36:15 -0700 |
|---|---|---|
| committer | Roland Dreier <rolandd@cisco.com> | 2009-09-05 20:36:15 -0700 |
| commit | ffe063f32bacad7d5111ae9c2b3e31addb47ce39 (patch) | |
| tree | a89ced9ae4f10ee6440fb7c22c0b020e940c6ef2 /drivers/infiniband/hw | |
| parent | deecb5d6728fff5288b6f7241ee8225ba0d8c6d2 (diff) | |
| download | linux-ffe063f32bacad7d5111ae9c2b3e31addb47ce39.tar.gz linux-ffe063f32bacad7d5111ae9c2b3e31addb47ce39.tar.bz2 linux-ffe063f32bacad7d5111ae9c2b3e31addb47ce39.zip | |
IB/mthca: Annotate CQ locking
mthca_ib_lock_cqs()/mthca_ib_unlock_cqs() are helper functions that
lock/unlock both CQs attached to a QP in the proper order to avoid
AB-BA deadlocks. Annotate this so sparse can understand what's going
on (and warn us if we misuse these functions).
Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband/hw')
| -rw-r--r-- | drivers/infiniband/hw/mthca/mthca_qp.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/infiniband/hw/mthca/mthca_qp.c b/drivers/infiniband/hw/mthca/mthca_qp.c index f5081bfde6db..c10576fa60c1 100644 --- a/drivers/infiniband/hw/mthca/mthca_qp.c +++ b/drivers/infiniband/hw/mthca/mthca_qp.c @@ -1319,10 +1319,12 @@ int mthca_alloc_qp(struct mthca_dev *dev, } static void mthca_lock_cqs(struct mthca_cq *send_cq, struct mthca_cq *recv_cq) + __acquires(&send_cq->lock) __acquires(&recv_cq->lock) { - if (send_cq == recv_cq) + if (send_cq == recv_cq) { spin_lock_irq(&send_cq->lock); - else if (send_cq->cqn < recv_cq->cqn) { + __acquire(&recv_cq->lock); + } else if (send_cq->cqn < recv_cq->cqn) { spin_lock_irq(&send_cq->lock); spin_lock_nested(&recv_cq->lock, SINGLE_DEPTH_NESTING); } else { @@ -1332,10 +1334,12 @@ static void mthca_lock_cqs(struct mthca_cq *send_cq, struct mthca_cq *recv_cq) } static void mthca_unlock_cqs(struct mthca_cq *send_cq, struct mthca_cq *recv_cq) + __releases(&send_cq->lock) __releases(&recv_cq->lock) { - if (send_cq == recv_cq) + if (send_cq == recv_cq) { + __release(&recv_cq->lock); spin_unlock_irq(&send_cq->lock); - else if (send_cq->cqn < recv_cq->cqn) { + } else if (send_cq->cqn < recv_cq->cqn) { spin_unlock(&recv_cq->lock); spin_unlock_irq(&send_cq->lock); } else { |