linux-kernel - [115/272] RDMA/cxgb4: Dont re-init wait object in init/fini paths

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Date:	Tue, 15 Feb 2011 16:12:52 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Steve Wise <swise@...ngridcomputing.com>,
	Roland Dreier <rolandd@...co.com>
Subject: [115/272] RDMA/cxgb4: Dont re-init wait object in init/fini paths

2.6.37-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Steve Wise <swise@...ngridcomputing.com>

commit db8b10167126d72829653690f57b9c7ca53c4d54 upstream.

Re-initializing the wait object in rdma_init()/rdma_fini() causes a
timing window which can lead to a deadlock during close.  Once this
deadlock hits, all RDMA activity over the T4 device will be stuck.

There's no need to re-init the wait object, so remove it.

Signed-off-by: Steve Wise <swise@...ngridcomputing.com>
Signed-off-by: Roland Dreier <rolandd@...co.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/infiniband/hw/cxgb4/qp.c |    2 --
 1 file changed, 2 deletions(-)

--- a/drivers/infiniband/hw/cxgb4/qp.c
+++ b/drivers/infiniband/hw/cxgb4/qp.c
@@ -1029,7 +1029,6 @@ static int rdma_fini(struct c4iw_dev *rh
 	wqe->cookie = (unsigned long) &ep->com.wr_wait;
 
 	wqe->u.fini.type = FW_RI_TYPE_FINI;
-	c4iw_init_wr_wait(&ep->com.wr_wait);
 	ret = c4iw_ofld_send(&rhp->rdev, skb);
 	if (ret)
 		goto out;
@@ -1125,7 +1124,6 @@ static int rdma_init(struct c4iw_dev *rh
 	if (qhp->attr.mpa_attr.initiator)
 		build_rtr_msg(qhp->attr.mpa_attr.p2p_type, &wqe->u.init);
 
-	c4iw_init_wr_wait(&qhp->ep->com.wr_wait);
 	ret = c4iw_ofld_send(&rhp->rdev, skb);
 	if (ret)
 		goto out;


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