linux-kernel - [PATCH 4.18 43/53] iommu/rockchip: Free irqs in shutdown handler

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Message-Id: <20181018175423.843074215@linuxfoundation.org>
Date:   Thu, 18 Oct 2018 19:54:36 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Marc Zyngier <marc.zyngier@....com>,
        Joerg Roedel <jroedel@...e.de>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.18 43/53] iommu/rockchip: Free irqs in shutdown handler

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Heiko Stuebner <heiko@...ech.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@...labora.com>
Fixes: 3fc7c5c0cff3 ("iommu/rockchip: Handle errors returned from PM framework")
Signed-off-by: Heiko Stuebner <heiko@...ech.de>
Tested-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
Acked-by: Marc Zyngier <marc.zyngier@....com>
Signed-off-by: Joerg Roedel <jroedel@...e.de>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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);
 }