iommu/rockchip: Fix error handling in attach

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@chromium.org>
Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

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 out_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 out_disable_stall;
 
 	spin_lock_irqsave(&rk_domain->iommus_lock, flags);
 	list_add_tail(&iommu->node, &rk_domain->iommus);
@@ -845,9 +845,9 @@ static int rk_iommu_attach_device(struct iommu_domain *domain,
 
 	dev_dbg(dev, "Attached to iommu domain\n");
 
+out_disable_stall:
 	rk_iommu_disable_stall(iommu);
-
-	return 0;
+	return ret;
 }
 
 static void rk_iommu_detach_device(struct iommu_domain *domain,