4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Miao Zhong zhongmiao@hisilicon.com
[ Upstream commit 0d535967ac658966c6ade8f82b5799092f7d5441 ]
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 Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/iommu/arm-smmu-v3.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/iommu/arm-smmu-v3.c +++ b/drivers/iommu/arm-smmu-v3.c @@ -1233,6 +1233,7 @@ static irqreturn_t arm_smmu_priq_thread(
/* 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; }