linux-kernel - [PATCH v1] memory: tegra: Register SMMU after MC driver became ready

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Date:   Tue,  8 May 2018 19:55:30 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>
Cc:     linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1] memory: tegra: Register SMMU after MC driver became ready

Memory Controller driver invokes SMMU driver registration and MC's
registers mapping is shared with SMMU. This mapping goes away if MC
driver probing fails after SMMU registration.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/memory/tegra/mc.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/memory/tegra/mc.c b/drivers/memory/tegra/mc.c
index 49dd7ad1459f..22ec959db7d3 100644
--- a/drivers/memory/tegra/mc.c
+++ b/drivers/memory/tegra/mc.c
@@ -692,15 +692,6 @@ static int tegra_mc_probe(struct platform_device *pdev)
 		return err;
 	}
 
-	if (IS_ENABLED(CONFIG_TEGRA_IOMMU_SMMU)) {
-		mc->smmu = tegra_smmu_probe(&pdev->dev, mc->soc->smmu, mc);
-		if (IS_ERR(mc->smmu)) {
-			dev_err(&pdev->dev, "failed to probe SMMU: %ld\n",
-				PTR_ERR(mc->smmu));
-			return PTR_ERR(mc->smmu);
-		}
-	}
-
 	err = tegra_mc_reset_setup(mc);
 	if (err < 0) {
 		dev_err(&pdev->dev, "failed to register reset controller: %d\n",
@@ -726,6 +717,15 @@ static int tegra_mc_probe(struct platform_device *pdev)
 		return err;
 	}
 
+	if (IS_ENABLED(CONFIG_TEGRA_IOMMU_SMMU)) {
+		mc->smmu = tegra_smmu_probe(&pdev->dev, mc->soc->smmu, mc);
+		if (IS_ERR(mc->smmu)) {
+			dev_err(&pdev->dev, "failed to probe SMMU: %ld\n",
+				PTR_ERR(mc->smmu));
+			return PTR_ERR(mc->smmu);
+		}
+	}
+
 	return 0;
 }
 
-- 
2.17.0