This is a note to let you know that I've just added the patch titled
IB/hfi1: Fix deadlock with txreq allocation slow path
to the 4.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ib-hfi1-fix-deadlock-with-txreq-allocation-slow-path.patch
and it can be found in the queue-4.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 2aee309d3e01447c55fdf89cef05a0e2be372655 Mon Sep 17 00:00:00 2001
From: Mike Marciniszyn <mike.marciniszyn@xxxxxxxxx>
Date: Fri, 17 Jun 2016 19:17:49 -0700
Subject: IB/hfi1: Fix deadlock with txreq allocation slow path
From: Mike Marciniszyn <mike.marciniszyn@xxxxxxxxx>
commit 2aee309d3e01447c55fdf89cef05a0e2be372655 upstream.
A failure in the get_txreq() inline will result in a
slow path retry using __get_txreq().
__get_txreq() attempts to procure the qp s_lock, which
is already held in all callers.
Fix by deleting the s_lock maintenance in __get_txreq()
and add sparse syntax hooks to future proof the code.
Cc: Stable <stable@xxxxxxxxxxxxxxx> # 4.6+
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@xxxxxxxxx>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@xxxxxxxxx>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@xxxxxxxxx>
Signed-off-by: Doug Ledford <dledford@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/rdma/hfi1/verbs_txreq.c | 4 +---
drivers/staging/rdma/hfi1/verbs_txreq.h | 1 +
2 files changed, 2 insertions(+), 3 deletions(-)
--- a/drivers/staging/rdma/hfi1/verbs_txreq.c
+++ b/drivers/staging/rdma/hfi1/verbs_txreq.c
@@ -92,11 +92,10 @@ void hfi1_put_txreq(struct verbs_txreq *
struct verbs_txreq *__get_txreq(struct hfi1_ibdev *dev,
struct rvt_qp *qp)
+ __must_hold(&qp->s_lock)
{
struct verbs_txreq *tx = ERR_PTR(-EBUSY);
- unsigned long flags;
- spin_lock_irqsave(&qp->s_lock, flags);
write_seqlock(&dev->iowait_lock);
if (ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK) {
struct hfi1_qp_priv *priv;
@@ -116,7 +115,6 @@ struct verbs_txreq *__get_txreq(struct h
}
out:
write_sequnlock(&dev->iowait_lock);
- spin_unlock_irqrestore(&qp->s_lock, flags);
return tx;
}
--- a/drivers/staging/rdma/hfi1/verbs_txreq.h
+++ b/drivers/staging/rdma/hfi1/verbs_txreq.h
@@ -73,6 +73,7 @@ struct verbs_txreq *__get_txreq(struct h
static inline struct verbs_txreq *get_txreq(struct hfi1_ibdev *dev,
struct rvt_qp *qp)
+ __must_hold(&qp->slock)
{
struct verbs_txreq *tx;
struct hfi1_qp_priv *priv = qp->priv;
Patches currently in stable-queue which might be from mike.marciniszyn@xxxxxxxxx are
queue-4.6/ib-hfi1-correct-issues-with-sc5-computation.patch
queue-4.6/ib-hfi1-fix-deadlock-with-txreq-allocation-slow-path.patch
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