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RDMA/cm: Add missing locking around id.state in cm_dup_req_handler 

All accesses to id.state must be done under the spinlock.

Fixes: a977049dac ("[PATCH] IB: Add the kernel CM implementation")
Link: https://lore.kernel.org/r/20200310092545.251365-10-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Jason Gunthorpe 2020-03-10 11:25:39 +02:00
parent c206f8bad1
commit d1de9a8807
1 changed files with 5 additions and 1 deletions
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6
drivers/infiniband/core/cm.c
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@ -1872,8 +1872,12 @@ 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)