iommu/arm-smmu-v3: sync the OVACKFLG to PRIQ consumer register

When PRI queue occurs overflow, driver should update the OVACKFLG to
the PRIQ consumer register, otherwise subsequent PRI requests will not
be processed.

Cc: Will Deacon <will.deacon@arm.com>
Cc: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: NMiao Zhong <zhongmiao@hisilicon.com>
Signed-off-by: NWill Deacon <will.deacon@arm.com>

drivers/iommu/arm-smmu-v3.c

@@ -1301,6 +1301,7 @@ static irqreturn_t arm_smmu_priq_thread(int irq, void *dev)
 
 	/* Sync our overflow flag, as we believe we're up to speed */
 	q->cons = Q_OVF(q, q->prod) | Q_WRP(q, q->cons) | Q_IDX(q, q->cons);
+	writel(q->cons, q->cons_reg);
 	return IRQ_HANDLED;
 }