lkml.org 
[lkml]   [2018]   [May]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 4.14 220/496] RDMA/qedr: Fix kernel panic when running fio over NFSoRDMA
Date
4.14-stable review patch.  If anyone has any objections, please let me know.

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

From: "Kalderon, Michal" <Michal.Kalderon@cavium.com>

[ Upstream commit e3fd112cbf21d049faf64ba1471d72b93c22109a ]

Race in qedr_poll_cq, lastest_cqe wasn't protected by lock,
leading to a case where two context's accessing poll_cq at
the same time lead to one of them having a pointer to an old
latest_cqe and reading an invalid cqe element

Signed-off-by: Amit Radzi <Amit.Radzi@cavium.com>
Signed-off-by: Michal Kalderon <Michal.Kalderon@cavium.com>
Signed-off-by: Ariel Elior <Ariel.Elior@cavium.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/infiniband/hw/qedr/verbs.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/infiniband/hw/qedr/verbs.c
+++ b/drivers/infiniband/hw/qedr/verbs.c
@@ -3518,7 +3518,7 @@ int qedr_poll_cq(struct ib_cq *ibcq, int
{
struct qedr_dev *dev = get_qedr_dev(ibcq->device);
struct qedr_cq *cq = get_qedr_cq(ibcq);
- union rdma_cqe *cqe = cq->latest_cqe;
+ union rdma_cqe *cqe;
u32 old_cons, new_cons;
unsigned long flags;
int update = 0;
@@ -3535,6 +3535,7 @@ int qedr_poll_cq(struct ib_cq *ibcq, int
return qedr_gsi_poll_cq(ibcq, num_entries, wc);

spin_lock_irqsave(&cq->cq_lock, flags);
+ cqe = cq->latest_cqe;
old_cons = qed_chain_get_cons_idx_u32(&cq->pbl);
while (num_entries && is_valid_cqe(cq, cqe)) {
struct qedr_qp *qp;

\
 
 \ /
  Last update: 2018-05-28 15:12    [W:0.916 / U:0.296 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site