linux-kernel - [PATCH] mfd: stmfx: Improve error message triggered by regulator fault in .remove()

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Date:   Mon,  7 Feb 2022 09:17:09 +0100
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Lee Jones <lee.jones@...aro.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>
Cc:     linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel@...gutronix.de
Subject: [PATCH] mfd: stmfx: Improve error message triggered by regulator fault in .remove()

Returning a non-zero value in an i2c remove callback results in the i2c
core emitting a very generic error message ("remove failed (-ESOMETHING),
will be ignored") and as the message indicates not further error handling
is done.

Instead emit a more specific error message and then return zero in
.remove().

The long-term goal is to make the i2c remove prototype return void, making
all implementations return 0 is preparatory work for this change.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
---
 drivers/mfd/stmfx.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/mfd/stmfx.c b/drivers/mfd/stmfx.c
index e095a3930142..16631c675f2f 100644
--- a/drivers/mfd/stmfx.c
+++ b/drivers/mfd/stmfx.c
@@ -392,17 +392,21 @@ static int stmfx_chip_init(struct i2c_client *client)
 	return ret;
 }
 
-static int stmfx_chip_exit(struct i2c_client *client)
+static void stmfx_chip_exit(struct i2c_client *client)
 {
 	struct stmfx *stmfx = i2c_get_clientdata(client);
 
 	regmap_write(stmfx->map, STMFX_REG_IRQ_SRC_EN, 0);
 	regmap_write(stmfx->map, STMFX_REG_SYS_CTRL, 0);
 
-	if (stmfx->vdd)
-		return regulator_disable(stmfx->vdd);
+	if (stmfx->vdd) {
+		int ret = regulator_disable(stmfx->vdd);
 
-	return 0;
+		if (ret)
+			dev_err(&client->dev,
+				"Failed to disable vdd regulator: %pe\n",
+				ERR_PTR(ret));
+	}
 }
 
 static int stmfx_probe(struct i2c_client *client,
@@ -466,7 +470,9 @@ static int stmfx_remove(struct i2c_client *client)
 {
 	stmfx_irq_exit(client);
 
-	return stmfx_chip_exit(client);
+	stmfx_chip_exit(client);
+
+	return 0;
 }
 
 #ifdef CONFIG_PM_SLEEP

base-commit: dcb85f85fa6f142aae1fe86f399d4503d49f2b60
-- 
2.34.1