linux-kernel - [PATCH v2] media: cxd2880-spi: Fix an error handling path

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Message-Id: <40b114d7200d2a87150249f8228b88f7a4ee15e0.1621599392.git.christophe.jaillet@wanadoo.fr>
Date:   Thu, 10 Jun 2021 21:54:31 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Yasunari.Takiguchi@...y.com, mchehab@...nel.org,
        narmstrong@...libre.com, sean@...s.org
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH v2] media: cxd2880-spi: Fix an error handling path

If an error occurs after a successful 'regulator_enable()' call,
'regulator_disable()' must be called.

Fix the error handling path of the probe accordingly.

Fixes: cb496cd472af ("media: cxd2880-spi: Add optional vcc regulator")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
v2: In case of error 'dvb_spi->vcc_supply' is set to NULL
    So test for NULL instead of IS_ERR as spotted by Sean Young

v1 was part of a small serie. Patch 2/2 has been applied, so this update
is now sent as a single patch
---
 drivers/media/spi/cxd2880-spi.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/media/spi/cxd2880-spi.c b/drivers/media/spi/cxd2880-spi.c
index 931ec0727cd3..df1335e7061c 100644
--- a/drivers/media/spi/cxd2880-spi.c
+++ b/drivers/media/spi/cxd2880-spi.c
@@ -524,13 +524,13 @@ cxd2880_spi_probe(struct spi_device *spi)
 	if (IS_ERR(dvb_spi->vcc_supply)) {
 		if (PTR_ERR(dvb_spi->vcc_supply) == -EPROBE_DEFER) {
 			ret = -EPROBE_DEFER;
-			goto fail_adapter;
+			goto fail_regulator;
 		}
 		dvb_spi->vcc_supply = NULL;
 	} else {
 		ret = regulator_enable(dvb_spi->vcc_supply);
 		if (ret)
-			goto fail_adapter;
+			goto fail_regulator;
 	}
 
 	dvb_spi->spi = spi;
@@ -618,6 +618,9 @@ cxd2880_spi_probe(struct spi_device *spi)
 fail_attach:
 	dvb_unregister_adapter(&dvb_spi->adapter);
 fail_adapter:
+	if (!dvb_spi->vcc_supply)
+		regulator_disable(dvb_spi->vcc_supply);
+fail_regulator:
 	kfree(dvb_spi);
 	return ret;
 }
-- 
2.30.2