linux-kernel - [PATCH 4/5] ib/ehca: check idr

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Date:	Tue, 12 Aug 2008 14:49:46 +0200
From:	Alexander Schmidt <alexs@...ux.vnet.ibm.com>
To:	linuxppc-dev <linuxppc-dev@...abs.org>,
	lkml <linux-kernel@...r.kernel.org>,
	of-ewg <ewg@...ts.openfabrics.org>,
	of-general <general@...ts.openfabrics.org>,
	Roland Dreier <rolandd@...co.com>
Cc:	Christoph Raisch <raisch@...ibm.com>,
	Hoang-Nam Nguyen <HNGUYEN@...ibm.com>,
	Joachim Fenkes <fenkes@...ibm.com>,
	Stefan Roscher <stefan.roscher@...ibm.com>
Subject: [PATCH 4/5] ib/ehca: check idr_find() return value

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@...ux.vnet.ibm.com>
---
 drivers/infiniband/hw/ehca/ehca_reqs.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- infiniband.git.orig/drivers/infiniband/hw/ehca/ehca_reqs.c
+++ infiniband.git/drivers/infiniband/hw/ehca/ehca_reqs.c
@@ -680,8 +680,10 @@ repoll:
 
 	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;
--
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