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RDMA/i40iw: Add qp table lock around AE processing

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QP may be freed during Async Event processing.
Add a lock around QP table to prevent it.

Signed-off-by: Mustafa Ismail <mustafa.ismail@intel.com>
Signed-off-by: Faisal Latif <faisal.latif@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Ismail, Mustafa
2016-04-18 10:32:59 -05:00
committed by Doug Ledford
parent 36a4793350
commit 996abf0a52
3 changed files with 16 additions and 3 deletions
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11
drivers/infiniband/hw/i40iw/i40iw_utils.c
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@@ -506,14 +506,19 @@ void i40iw_rem_ref(struct ib_qp *ibqp)
struct cqp_commands_info *cqp_info;
struct i40iw_device *iwdev;
u32 qp_num;
unsigned long flags;
iwqp = to_iwqp(ibqp);
if (!atomic_dec_and_test(&iwqp->refcount))
return;
iwdev = iwqp->iwdev;
spin_lock_irqsave(&iwdev->qptable_lock, flags);
if (!atomic_dec_and_test(&iwqp->refcount)) {
spin_unlock_irqrestore(&iwdev->qptable_lock, flags);
return;
}
qp_num = iwqp->ibqp.qp_num;
iwdev->qp_table[qp_num] = NULL;
spin_unlock_irqrestore(&iwdev->qptable_lock, flags);
cqp_request = i40iw_get_cqp_request(&iwdev->cqp, false);
if (!cqp_request)
return;