From: Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
To: rdreier-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org
Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: [PATCH] Don't re-init wait object in init/fini paths.
Date: Fri, 07 Jan 2011 11:37:59 -0600 [thread overview]
Message-ID: <20110107173759.14812.25906.stgit@build.ogc.int> (raw)
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-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
Cc: <stable-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
drivers/infiniband/hw/cxgb4/qp.c | 2 --
1 files changed, 0 insertions(+), 2 deletions(-)
diff --git a/drivers/infiniband/hw/cxgb4/qp.c b/drivers/infiniband/hw/cxgb4/qp.c
index 057cb25..3ccb765 100644
--- 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 *rhp, struct c4iw_qp *qhp,
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 *rhp, struct c4iw_qp *qhp)
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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next reply other threads:[~2011-01-07 17:37 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-07 17:37 Steve Wise [this message]
[not found] ` <20110107173759.14812.25906.stgit-T4OLL4TyM9aNDNWfRnPdfg@public.gmane.org>
2011-01-10 18:56 ` [PATCH] Don't re-init wait object in init/fini paths Roland Dreier
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