linux-kernel - Applied "regulator: tps65917/palmas: Handle possible memory allocation failure" to the regulator tree

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Message-Id: <E1ayjOx-0006sO-GE@debutante>
Date:	Fri, 06 May 2016 18:18:55 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Nishanth Menon <nm@...com>
Cc:	Mark Brown <broonie@...nel.org>, Tony Lindgren <tony@...mide.com>,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	Mark Brown <broonie@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Keerthy <j-keerthy@...com>, Stephen Warren <swarren@...dia.com>,
	Laxman Dewangan <ldewangan@...dia.com>
Subject: Applied "regulator: tps65917/palmas: Handle possible memory allocation failure" to the regulator tree

The patch

   regulator: tps65917/palmas: Handle possible memory allocation failure

has been applied to the regulator tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 7f091e53c9efc52b2b3a03a8a1d479a47956fecd Mon Sep 17 00:00:00 2001
From: Nishanth Menon <nm@...com>
Date: Thu, 5 May 2016 19:29:51 -0500
Subject: [PATCH] regulator: tps65917/palmas: Handle possible memory allocation
 failure

Stop the palmas regulator driver from imagining that the allocations
will always succeed. Since regulator dt nodes are optional in nature and
can be described in downstream drivers via platform data, continue to
maintain code flow as prior when of node is not found.

Signed-off-by: Nishanth Menon <nm@...com>
Signed-off-by: Mark Brown <broonie@...nel.org>
---
 drivers/regulator/palmas-regulator.c | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/drivers/regulator/palmas-regulator.c b/drivers/regulator/palmas-regulator.c
index 3b9206224cd1..faa389be7ca3 100644
--- a/drivers/regulator/palmas-regulator.c
+++ b/drivers/regulator/palmas-regulator.c
@@ -1467,10 +1467,10 @@ static struct palmas_pmic_driver_data tps65917_ddata = {
 	.ldo_register = tps65917_ldo_registration,
 };
 
-static void palmas_dt_to_pdata(struct device *dev,
-			       struct device_node *node,
-			       struct palmas_pmic_platform_data *pdata,
-			       struct palmas_pmic_driver_data *ddata)
+static int palmas_dt_to_pdata(struct device *dev,
+			      struct device_node *node,
+			      struct palmas_pmic_platform_data *pdata,
+			      struct palmas_pmic_driver_data *ddata)
 {
 	struct device_node *regulators;
 	u32 prop;
@@ -1479,7 +1479,7 @@ static void palmas_dt_to_pdata(struct device *dev,
 	regulators = of_get_child_by_name(node, "regulators");
 	if (!regulators) {
 		dev_info(dev, "regulator node not found\n");
-		return;
+		return 0;
 	}
 
 	ret = of_regulator_match(dev, regulators, ddata->palmas_matches,
@@ -1487,7 +1487,7 @@ static void palmas_dt_to_pdata(struct device *dev,
 	of_node_put(regulators);
 	if (ret < 0) {
 		dev_err(dev, "Error parsing regulator init data: %d\n", ret);
-		return;
+		return 0;
 	}
 
 	for (idx = 0; idx < ddata->max_reg; idx++) {
@@ -1500,6 +1500,9 @@ static void palmas_dt_to_pdata(struct device *dev,
 			continue;
 
 		rinit = devm_kzalloc(dev, sizeof(*rinit), GFP_KERNEL);
+		if (!rinit)
+			return -ENOMEM;
+
 		pdata->reg_data[idx] = match->init_data;
 		pdata->reg_init[idx] = rinit;
 
@@ -1552,6 +1555,8 @@ static void palmas_dt_to_pdata(struct device *dev,
 	}
 
 	pdata->ldo6_vibrator = of_property_read_bool(node, "ti,ldo6-vibrator");
+
+	return 0;
 }
 
 static const struct of_device_id of_palmas_match_tbl[] = {
@@ -1633,7 +1638,9 @@ static int palmas_regulators_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, pmic);
 	pmic->palmas->pmic_ddata = driver_data;
 
-	palmas_dt_to_pdata(&pdev->dev, node, pdata, driver_data);
+	ret = palmas_dt_to_pdata(&pdev->dev, node, pdata, driver_data);
+	if (ret)
+		return ret;
 
 	ret = palmas_smps_read(palmas, PALMAS_SMPS_CTRL, &reg);
 	if (ret)
-- 
2.8.1