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IB/mthca: Make all device methods truly reentrant

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Documentation/infiniband/core_locking.txt says:

  All of the methods in struct ib_device exported by a low-level
  driver must be fully reentrant.  The low-level driver is required to
  perform all synchronization necessary to maintain consistency, even
  if multiple function calls using the same object are run
  simultaneously.

However, mthca's modify_qp, modify_srq and resize_cq methods are
currently not reentrant.  Add a mutex to the QP, SRQ and CQ structures
so that these calls can be properly serialized.

Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Roland Dreier
2006-06-17 20:37:41 -07:00
parent c9c5d9feef
commit c93b6fbaa9
5 changed files with 48 additions and 22 deletions
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5
drivers/infiniband/hw/mthca/mthca_srq.c
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@ -243,6 +243,7 @@ int mthca_alloc_srq(struct mthca_dev *dev, struct mthca_pd *pd,
spin_lock_init(&srq->lock);
srq->refcount = 1;
init_waitqueue_head(&srq->wait);
mutex_init(&srq->mutex);
if (mthca_is_memfree(dev))
mthca_arbel_init_srq_context(dev, pd, srq, mailbox->buf);
@ -371,7 +372,11 @@ int mthca_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
if (attr_mask & IB_SRQ_LIMIT) {
if (attr->srq_limit > srq->max)
return -EINVAL;
mutex_lock(&srq->mutex);
ret = mthca_ARM_SRQ(dev, srq->srqn, attr->srq_limit, &status);
mutex_unlock(&srq->mutex);
if (ret)
return ret;
if (status)