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IB/ehca: Check idr_find() return value

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The idr_find() function may fail when trying to get the QP that is
associated with a CQE, e.g. when a QP has been destroyed between the
generation of a CQE and the poll request for it.  In consequence, the
return value of idr_find() must be checked and the CQE must be
discarded when the QP cannot be found.

Signed-off-by: Alexander Schmidt <alexs@linux.vnet.ibm.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Alexander Schmidt 2008-08-12 15:46:27 +02:00 committed by Roland Dreier
parent 17c2b53adb
commit 129a10fb81
1 changed files with 3 additions and 1 deletions
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4
drivers/infiniband/hw/ehca/ehca_reqs.c
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@ -680,8 +680,10 @@ static inline int ehca_poll_cq_one(struct ib_cq *cq, struct ib_wc *wc)
read_lock(&ehca_qp_idr_lock);
my_qp = idr_find(&ehca_qp_idr, cqe->qp_token);
wc->qp = &my_qp->ib_qp;
read_unlock(&ehca_qp_idr_lock);
if (!my_qp)
goto repoll;
wc->qp = &my_qp->ib_qp;
wc->byte_len = cqe->nr_bytes_transferred;
wc->pkey_index = cqe->pkey_index;