releases/4.18.16/iommu-rockchip-free-irqs-in-shutdown-handler.patch

From foo@baz Thu Oct 18 11:08:35 CEST 2018
From: Heiko Stuebner <heiko@sntech.de>
Date: Mon, 27 Aug 2018 12:56:24 +0200
Subject: iommu/rockchip: Free irqs in shutdown handler

From: Heiko Stuebner <heiko@sntech.de>

[ Upstream commit 74bc2abca7603c956d1e331e8b9bee7b874c1eec ]

In the iommu's shutdown handler we disable runtime-pm which could
result in the irq-handler running unclocked and since commit
    3fc7c5c0cff3 ("iommu/rockchip: Handle errors returned from PM framework")
we warn about that fact.

This can cause warnings on shutdown on some Rockchip machines, so
free the irqs in the shutdown handler before we disable runtime-pm.

Reported-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Fixes: 3fc7c5c0cff3 ("iommu/rockchip: Handle errors returned from PM framework")
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/iommu/rockchip-iommu.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/iommu/rockchip-iommu.c
+++ b/drivers/iommu/rockchip-iommu.c
@@ -1242,6 +1242,12 @@ err_unprepare_clocks:
 
 static void rk_iommu_shutdown(struct platform_device *pdev)
 {
+	struct rk_iommu *iommu = platform_get_drvdata(pdev);
+	int i = 0, irq;
+
+	while ((irq = platform_get_irq(pdev, i++)) != -ENXIO)
+		devm_free_irq(iommu->dev, irq, iommu);
+
 	pm_runtime_force_suspend(&pdev->dev);
 }