linux-kernel - [PATCH 5.4 21/30] soc: sunxi: sram: Fix probe function ordering issues

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Message-Id: <20221003070716.921882473@linuxfoundation.org>
Date:   Mon,  3 Oct 2022 09:12:03 +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, Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 21/30] soc: sunxi: sram: Fix probe function ordering issues

From: Samuel Holland <samuel@...lland.org>

[ Upstream commit 49fad91a7b8941979c3e9a35f9894ac45bc5d3d6 ]

Errors from debugfs are intended to be non-fatal, and should not prevent
the driver from probing.

Since debugfs file creation is treated as infallible, move it below the
parts of the probe function that can fail. This prevents an error
elsewhere in the probe function from causing the file to leak. Do the
same for the call to of_platform_populate().

Finally, checkpatch suggests an octal literal for the file permissions.

Fixes: 4af34b572a85 ("drivers: soc: sunxi: Introduce SoC driver to map SRAMs")
Fixes: 5828729bebbb ("soc: sunxi: export a regmap for EMAC clock reg on A64")
Reviewed-by: Jernej Skrabec <jernej.skrabec@...il.com>
Signed-off-by: Samuel Holland <samuel@...lland.org>
Tested-by: Heiko Stuebner <heiko@...ech.de>
Signed-off-by: Jernej Skrabec <jernej.skrabec@...il.com>
Link: https://lore.kernel.org/r/20220815041248.53268-6-samuel@sholland.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/soc/sunxi/sunxi_sram.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/drivers/soc/sunxi/sunxi_sram.c b/drivers/soc/sunxi/sunxi_sram.c
index 3a350828965e..08fe49b766bd 100644
--- a/drivers/soc/sunxi/sunxi_sram.c
+++ b/drivers/soc/sunxi/sunxi_sram.c
@@ -321,9 +321,9 @@ static struct regmap_config sunxi_sram_emac_clock_regmap = {
 
 static int __init sunxi_sram_probe(struct platform_device *pdev)
 {
-	struct dentry *d;
 	struct regmap *emac_clock;
 	const struct sunxi_sramc_variant *variant;
+	struct device *dev = &pdev->dev;
 
 	sram_dev = &pdev->dev;
 
@@ -335,13 +335,6 @@ static int __init sunxi_sram_probe(struct platform_device *pdev)
 	if (IS_ERR(base))
 		return PTR_ERR(base);
 
-	of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
-
-	d = debugfs_create_file("sram", S_IRUGO, NULL, NULL,
-				&sunxi_sram_fops);
-	if (!d)
-		return -ENOMEM;
-
 	if (variant->has_emac_clock) {
 		emac_clock = devm_regmap_init_mmio(&pdev->dev, base,
 						   &sunxi_sram_emac_clock_regmap);
@@ -350,6 +343,10 @@ static int __init sunxi_sram_probe(struct platform_device *pdev)
 			return PTR_ERR(emac_clock);
 	}
 
+	of_platform_populate(dev->of_node, NULL, NULL, dev);
+
+	debugfs_create_file("sram", 0444, NULL, NULL, &sunxi_sram_fops);
+
 	return 0;
 }
 
-- 
2.35.1