[PATCH v4 04/13] iommu/rockchip: Fix error handling in attach

[Jeffy Chen]

From: Tomasz Figa <tfiga at chromium.org>

Currently if the driver encounters an error while attaching device, it
will leave the IOMMU in an inconsistent state. Even though it shouldn't
really happen in reality, let's just add proper error path to keep
things consistent.

Signed-off-by: Tomasz Figa <tfiga at chromium.org>
Signed-off-by: Jeffy Chen <jeffy.chen at rock-chips.com>
---

Changes in v4: None
Changes in v3: None
Changes in v2:
Move irq request to probe(in patch[0])

 drivers/iommu/rockchip-iommu.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockchip-iommu.c
index b743d82e6fe1..37065a7127c9 100644
--- a/drivers/iommu/rockchip-iommu.c
+++ b/drivers/iommu/rockchip-iommu.c
@@ -824,7 +824,7 @@ static int rk_iommu_attach_device(struct iommu_domain *domain,
 
 	ret = rk_iommu_force_reset(iommu);
 	if (ret)
-		return ret;
+		goto err_disable_stall;
 
 	iommu->domain = domain;
 
@@ -837,7 +837,7 @@ static int rk_iommu_attach_device(struct iommu_domain *domain,
 
 	ret = rk_iommu_enable_paging(iommu);
 	if (ret)
-		return ret;
+		goto err_disable_stall;
 
 	spin_lock_irqsave(&rk_domain->iommus_lock, flags);
 	list_add_tail(&iommu->node, &rk_domain->iommus);
@@ -848,6 +848,11 @@ static int rk_iommu_attach_device(struct iommu_domain *domain,
 	rk_iommu_disable_stall(iommu);
 
 	return 0;
+
+err_disable_stall:
+	rk_iommu_disable_stall(iommu);
+
+	return ret;
 }
 
 static void rk_iommu_detach_device(struct iommu_domain *domain,
-- 
2.11.0