linux-kernel - [PATCH] mmc: mxs-mmc: Disable the 'reg

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Message-Id: <d05074c11962a046ff9c2f457c240432ca8a7194.1621600443.git.christophe.jaillet@wanadoo.fr>
Date:   Fri, 21 May 2021 14:36:39 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     ulf.hansson@...aro.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        linux-imx@....com, wsa+renesas@...g-engineering.com,
        dianders@...omium.org, rmfrfs@...il.com, cjb@...top.org,
        linux-arm-kernel@...ts.infradead.org
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] mmc: mxs-mmc: Disable the 'reg_vmmc' regulator when needed

The 'reg_vmmc' regulator is never disabled. Neither in the error handling
of the probe, nor in the remove function.

Add a managed action to do the required clean-up before a 'regulator_put()'
call.

Fixes: 4dc5a79f1350 ("mmc: mxs-mmc: enable regulator for mmc slot")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/mmc/host/mxs-mmc.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c
index 947581de7860..b043d53dd728 100644
--- a/drivers/mmc/host/mxs-mmc.c
+++ b/drivers/mmc/host/mxs-mmc.c
@@ -552,6 +552,13 @@ static const struct of_device_id mxs_mmc_dt_ids[] = {
 };
 MODULE_DEVICE_TABLE(of, mxs_mmc_dt_ids);
 
+static void regulator_disable_action(void *_data)
+{
+	struct regulator *regulator = _data;
+
+	regulator_disable(regulator);
+}
+
 static int mxs_mmc_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
@@ -591,6 +598,10 @@ static int mxs_mmc_probe(struct platform_device *pdev)
 				"Failed to enable vmmc regulator: %d\n", ret);
 			goto out_mmc_free;
 		}
+		ret = devm_add_action_or_reset(&pdev->dev,
+					regulator_disable_action, reg_vmmc);
+		if (ret)
+			goto out_mmc_free;
 	}
 
 	ssp->clk = devm_clk_get(&pdev->dev, NULL);
-- 
2.30.2