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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: Miao Zhong <zhongmiao@hisilicon.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Miao Zhong 2018-07-23 20:56:58 +08:00 committed by Will Deacon
parent d1e20222d5
commit 0d535967ac
1 changed files with 1 additions and 0 deletions
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drivers/iommu/arm-smmu-v3.c
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@ -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;
}