linux-kernel - [PATCH v4 4/7] regulator: axp20x: reset probe data before each probe

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Message-Id: <1402990723-28138-5-git-send-email-boris.brezillon@free-electrons.com>
Date:	Tue, 17 Jun 2014 09:38:40 +0200
From:	Boris BREZILLON <boris.brezillon@...e-electrons.com>
To:	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>
Cc:	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Carlo Caione <carlo@...one.org>,
	Shuge <shuge@...winnertech.com>, kevin@...winnertech.com,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	dev@...ux-sunxi.org,
	Boris BREZILLON <boris.brezillon@...e-electrons.com>
Subject: [PATCH v4 4/7] regulator: axp20x: reset probe data before each probe

The init_data and of_node fields of the axp2xx_matches tables are filled
at each device probe by the axp20x_regulator_parse_dt function (which then
calls the of_regulator_match function).
This means we can probe a new device and consider data initialized during
the probe of another device as valid.

Reset init_data and of_node field to NULL before each probe in order to
avoid this kind of issue.

Signed-off-by: Boris BREZILLON <boris.brezillon@...e-electrons.com>
---
 drivers/regulator/axp20x-regulator.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/regulator/axp20x-regulator.c b/drivers/regulator/axp20x-regulator.c
index 7a30f49..d42bf6d 100644
--- a/drivers/regulator/axp20x-regulator.c
+++ b/drivers/regulator/axp20x-regulator.c
@@ -324,6 +324,15 @@ static int axp20x_regulator_probe(struct platform_device *pdev)
 		nregulators = AXP20X_REG_ID_MAX;
 	}
 
+	/*
+	 * Reset matches table (this table might have been modified by a
+	 * previous AXP2xx device probe).
+	 */
+	for (i = 0; i < nmatches; i++) {
+		matches[i].init_data = NULL;
+		matches[i].of_node = NULL;
+	}
+
 	ret = axp20x_regulator_parse_dt(pdev, matches, nmatches);
 	if (ret)
 		return ret;
-- 
1.8.3.2

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