linux-kernel - [PATCH 4.18 044/197] iommu/rockchip: Handle errors returned from PM framework

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Date:   Thu, 13 Sep 2018 15:29:53 +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, Heiko Stuebner <heiko@...ech.de>,
        Marc Zyngier <marc.zyngier@....com>,
        Olof Johansson <olof@...om.net>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.18 044/197] iommu/rockchip: Handle errors returned from PM framework

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

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

From: Marc Zyngier <marc.zyngier@....com>

[ Upstream commit 3fc7c5c0cff3150e471f5fd12f59971c6d2c6513 ]

pm_runtime_get_if_in_use can fail: either PM has been disabled
altogether (-EINVAL), or the device hasn't been enabled yet (0).
Sadly, the Rockchip IOMMU driver tends to conflate the two things
by considering a non-zero return value as successful.

This has the consequence of hiding other bugs, so let's handle this
case throughout the driver, with a WARN_ON_ONCE so that we can try
and work out what happened.

Fixes: 0f181d3cf7d98 ("iommu/rockchip: Add runtime PM support")
Reviewed-by: Heiko Stuebner <heiko@...ech.de>
Signed-off-by: Marc Zyngier <marc.zyngier@....com>
Signed-off-by: Olof Johansson <olof@...om.net>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/iommu/rockchip-iommu.c |   21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

--- a/drivers/iommu/rockchip-iommu.c
+++ b/drivers/iommu/rockchip-iommu.c
@@ -521,10 +521,11 @@ static irqreturn_t rk_iommu_irq(int irq,
 	u32 int_status;
 	dma_addr_t iova;
 	irqreturn_t ret = IRQ_NONE;
-	int i;
+	int i, err;
 
-	if (WARN_ON(!pm_runtime_get_if_in_use(iommu->dev)))
-		return 0;
+	err = pm_runtime_get_if_in_use(iommu->dev);
+	if (WARN_ON_ONCE(err <= 0))
+		return ret;
 
 	if (WARN_ON(clk_bulk_enable(iommu->num_clocks, iommu->clocks)))
 		goto out;
@@ -620,11 +621,15 @@ static void rk_iommu_zap_iova(struct rk_
 	spin_lock_irqsave(&rk_domain->iommus_lock, flags);
 	list_for_each(pos, &rk_domain->iommus) {
 		struct rk_iommu *iommu;
+		int ret;
 
 		iommu = list_entry(pos, struct rk_iommu, node);
 
 		/* Only zap TLBs of IOMMUs that are powered on. */
-		if (pm_runtime_get_if_in_use(iommu->dev)) {
+		ret = pm_runtime_get_if_in_use(iommu->dev);
+		if (WARN_ON_ONCE(ret < 0))
+			continue;
+		if (ret) {
 			WARN_ON(clk_bulk_enable(iommu->num_clocks,
 						iommu->clocks));
 			rk_iommu_zap_lines(iommu, iova, size);
@@ -891,6 +896,7 @@ static void rk_iommu_detach_device(struc
 	struct rk_iommu *iommu;
 	struct rk_iommu_domain *rk_domain = to_rk_domain(domain);
 	unsigned long flags;
+	int ret;
 
 	/* Allow 'virtual devices' (eg drm) to detach from domain */
 	iommu = rk_iommu_from_dev(dev);
@@ -909,7 +915,9 @@ static void rk_iommu_detach_device(struc
 	list_del_init(&iommu->node);
 	spin_unlock_irqrestore(&rk_domain->iommus_lock, flags);
 
-	if (pm_runtime_get_if_in_use(iommu->dev)) {
+	ret = pm_runtime_get_if_in_use(iommu->dev);
+	WARN_ON_ONCE(ret < 0);
+	if (ret > 0) {
 		rk_iommu_disable(iommu);
 		pm_runtime_put(iommu->dev);
 	}
@@ -946,7 +954,8 @@ static int rk_iommu_attach_device(struct
 	list_add_tail(&iommu->node, &rk_domain->iommus);
 	spin_unlock_irqrestore(&rk_domain->iommus_lock, flags);
 
-	if (!pm_runtime_get_if_in_use(iommu->dev))
+	ret = pm_runtime_get_if_in_use(iommu->dev);
+	if (!ret || WARN_ON_ONCE(ret < 0))
 		return 0;
 
 	ret = rk_iommu_enable(iommu);