linux-kernel - [PATCHv4 03/10] mfd: ti-lmu: use managed resource for everything

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20180330172414.26575-4-sebastian.reichel@collabora.co.uk>
Date:   Fri, 30 Mar 2018 19:24:07 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.co.uk>
To:     Sebastian Reichel <sre@...nel.org>, Milo Kim <Milo.Kim@...com>,
        Lee Jones <lee.jones@...aro.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Tony Lindgren <tony@...mide.com>
Cc:     Jingoo Han <jingoohan1@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        linux-kernel@...r.kernel.org, linux-fbdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-omap@...r.kernel.org,
        Sebastian Reichel <sebastian.reichel@...labora.co.uk>
Subject: [PATCHv4 03/10] mfd: ti-lmu: use managed resource for everything

This replaces all remaining unmanaged resources with device
managed ones, so that the remove function is no longer needed.
This makes the code slightly shorter and fixes two problems:

1. The hardware is disabled after the child devices have
   been removed. Previously there was a potential race
   condition.
2. The hardware is disabled when mfd_add_devices fails
   during probe.

Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.co.uk>
---
 drivers/mfd/ti-lmu.c | 21 ++++++++-------------
 1 file changed, 8 insertions(+), 13 deletions(-)

diff --git a/drivers/mfd/ti-lmu.c b/drivers/mfd/ti-lmu.c
index e14cb9f41b44..2ee09d099832 100644
--- a/drivers/mfd/ti-lmu.c
+++ b/drivers/mfd/ti-lmu.c
@@ -47,8 +47,9 @@ static int ti_lmu_enable_hw(struct ti_lmu *lmu, enum ti_lmu_id id)
 	return 0;
 }
 
-static void ti_lmu_disable_hw(struct ti_lmu *lmu)
+static void ti_lmu_disable_hw(void *data)
 {
+	struct ti_lmu *lmu = data;
 	if (lmu->en_gpio)
 		gpiod_set_value(lmu->en_gpio, 0);
 }
@@ -205,6 +206,10 @@ static int ti_lmu_probe(struct i2c_client *cl, const struct i2c_device_id *id)
 	if (ret)
 		return ret;
 
+	ret = devm_add_action_or_reset(dev, ti_lmu_disable_hw, lmu);
+	if (ret)
+		return ret;
+
 	/*
 	 * Fault circuit(open/short) can be detected by ti-lmu-fault-monitor.
 	 * After fault detection is done, some devices should re-initialize
@@ -214,17 +219,8 @@ static int ti_lmu_probe(struct i2c_client *cl, const struct i2c_device_id *id)
 
 	i2c_set_clientdata(cl, lmu);
 
-	return mfd_add_devices(lmu->dev, 0, data->cells,
-			       data->num_cells, NULL, 0, NULL);
-}
-
-static int ti_lmu_remove(struct i2c_client *cl)
-{
-	struct ti_lmu *lmu = i2c_get_clientdata(cl);
-
-	ti_lmu_disable_hw(lmu);
-	mfd_remove_devices(lmu->dev);
-	return 0;
+	return devm_mfd_add_devices(lmu->dev, 0, data->cells,
+				    data->num_cells, NULL, 0, NULL);
 }
 
 static const struct i2c_device_id ti_lmu_ids[] = {
@@ -240,7 +236,6 @@ MODULE_DEVICE_TABLE(i2c, ti_lmu_ids);
 
 static struct i2c_driver ti_lmu_driver = {
 	.probe = ti_lmu_probe,
-	.remove = ti_lmu_remove,
 	.driver = {
 		.name = "ti-lmu",
 		.of_match_table = ti_lmu_of_match,
-- 
2.16.2