RDMA/irdma: Take a lock before moving SRQ tail in poll_cq

Need to take an SRQ lock in poll_cq before moving SRQ tail.

Signed-off-by: Jay Bhat <[e-mail]>
Reviewed-by: Jacob Moroni <[e-mail]>
Signed-off-by: Tatyana Nikolova <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Leon Romanovsky <[e-mail]>

drivers/infiniband/hw/irdma/uk.c

···
 	info->op_type = (u8)FIELD_GET(IRDMACQ_OP, qword3);
 
 	if (info->q_type == IRDMA_CQE_QTYPE_RQ && is_srq) {
+		unsigned long flags;
+
 		srq = qp->srq_uk;
 
 		get_64bit_val(cqe, 8, &info->wr_id);
···
 		} else {
 			info->stag_invalid_set = false;
 		}
+		spin_lock_irqsave(srq->lock, flags);
 		IRDMA_RING_MOVE_TAIL(srq->srq_ring);
+		spin_unlock_irqrestore(srq->lock, flags);
 		pring = &srq->srq_ring;
+
 	} else if (info->q_type == IRDMA_CQE_QTYPE_RQ && !is_srq) {
 		u32 array_idx;
 

drivers/infiniband/hw/irdma/user.h

···
 	u8 wqe_size;
 	u8 wqe_size_multiplier;
 	u8 deferred_flag;
+	spinlock_t *lock;
 };
 
 struct irdma_srq_uk_init_info {

drivers/infiniband/hw/irdma/verbs.c

···
 	info.vsi = &iwdev->vsi;
 	info.pd = &iwpd->sc_pd;
 
+	iwsrq->sc_srq.srq_uk.lock = &iwsrq->lock;
 	err_code = irdma_sc_srq_init(&iwsrq->sc_srq, &info);
 	if (err_code)
 		goto free_dmem;