From: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
[ Upstream commit d1de9a88074b66482443f0cd91618d7b51a7c9b6 ]
All accesses to id.state must be done under the spinlock.
Fixes: a977049dacde ("[PATCH] IB: Add the kernel CM implementation")
Link: https://lore.kernel.org/r/20200310092545.251365-10-leon@xxxxxxxxxx
Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/infiniband/core/cm.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/infiniband/core/cm.c b/drivers/infiniband/core/cm.c
index 304429fd04ddb..c764a29c11323 100644
--- a/drivers/infiniband/core/cm.c
+++ b/drivers/infiniband/core/cm.c
@@ -1544,8 +1544,12 @@ static void cm_dup_req_handler(struct cm_work *work,
counter[CM_REQ_COUNTER]);
/* Quick state check to discard duplicate REQs. */
- if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
+ spin_lock_irq(&cm_id_priv->lock);
+ if (cm_id_priv->id.state == IB_CM_REQ_RCVD) {
+ spin_unlock_irq(&cm_id_priv->lock);
return;
+ }
+ spin_unlock_irq(&cm_id_priv->lock);
ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
if (ret)
--
2.20.1
