linux-kernel - [PATCH] memory: tegra: add missing put_devcie() call in tegra_emc

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Date:   Sat, 31 Oct 2020 18:53:55 +0800
From:   Yu Kuai <yukuai3@...wei.com>
To:     <krzk@...nel.org>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>, <mperttunen@...dia.com>,
        <tomeu.vizoso@...labora.com>
CC:     <linux-kernel@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <yukuai3@...wei.com>, <yi.zhang@...wei.com>
Subject: [PATCH] memory: tegra: add missing put_devcie() call in tegra_emc_probe()

if of_find_device_by_node() succeed, tegra_emc_probe() doesn't have a
corresponding put_device(). Thus add jump target to fix the exception
handling for this function implementation.

Fixes: 73a7f0a90641("memory: tegra: Add EMC (external memory controller) driver")
Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 drivers/memory/tegra/tegra124-emc.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/memory/tegra/tegra124-emc.c b/drivers/memory/tegra/tegra124-emc.c
index 76ace42a688a..831dfca0804c 100644
--- a/drivers/memory/tegra/tegra124-emc.c
+++ b/drivers/memory/tegra/tegra124-emc.c
@@ -1207,8 +1207,10 @@ static int tegra_emc_probe(struct platform_device *pdev)
 		return -ENOENT;
 
 	emc->mc = platform_get_drvdata(mc);
-	if (!emc->mc)
-		return -EPROBE_DEFER;
+	if (!emc->mc) {
+		err = -EPROBE_DEFER;
+		goto put_device;
+	}
 
 	ram_code = tegra_read_ram_code();
 
@@ -1217,25 +1219,27 @@ static int tegra_emc_probe(struct platform_device *pdev)
 		dev_err(&pdev->dev,
 			"no memory timings for RAM code %u found in DT\n",
 			ram_code);
-		return -ENOENT;
+		err = -ENOENT;
+		goto put_device;
 	}
 
 	err = tegra_emc_load_timings_from_dt(emc, np);
 	of_node_put(np);
 	if (err)
-		return err;
+		goto put_device;
 
 	if (emc->num_timings == 0) {
 		dev_err(&pdev->dev,
 			"no memory timings for RAM code %u registered\n",
 			ram_code);
-		return -ENOENT;
+		err = -ENOENT;
+		goto put_device;
 	}
 
 	err = emc_init(emc);
 	if (err) {
 		dev_err(&pdev->dev, "EMC initialization failed: %d\n", err);
-		return err;
+		goto put_device;
 	}
 
 	platform_set_drvdata(pdev, emc);
@@ -1244,6 +1248,9 @@ static int tegra_emc_probe(struct platform_device *pdev)
 		emc_debugfs_init(&pdev->dev, emc);
 
 	return 0;
+put_device:
+	put_device(&mc->dev);
+	return err;
 };
 
 static struct platform_driver tegra_emc_driver = {
-- 
2.25.4