linux-kernel - [PATCH AUTOSEL 3.18 16/16] i2c: scmi: Fix probe error on devices with an empty SMB0001 ACPI device node

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: <20181213043343.76896-16-sashal@kernel.org>
Date:   Wed, 12 Dec 2018 23:33:43 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Hans de Goede <hdegoede@...hat.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        Sasha Levin <sashal@...nel.org>, linux-i2c@...r.kernel.org
Subject: [PATCH AUTOSEL 3.18 16/16] i2c: scmi: Fix probe error on devices with an empty SMB0001 ACPI device node

From: Hans de Goede <hdegoede@...hat.com>

[ Upstream commit 0544ee4b1ad574aec3b6379af5f5cdee42840971 ]

Some AMD based HP laptops have a SMB0001 ACPI device node which does not
define any methods.

This leads to the following error in dmesg:

[    5.222731] cmi: probe of SMB0001:00 failed with error -5

This commit makes acpi_smbus_cmi_add() return -ENODEV instead in this case
silencing the error. In case of a failure of the i2c_add_adapter() call
this commit now propagates the error from that call instead of -EIO.

Signed-off-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Wolfram Sang <wsa@...-dreams.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/i2c/busses/i2c-scmi.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/i2c/busses/i2c-scmi.c b/drivers/i2c/busses/i2c-scmi.c
index efefcfa24a4c..d2178f701b41 100644
--- a/drivers/i2c/busses/i2c-scmi.c
+++ b/drivers/i2c/busses/i2c-scmi.c
@@ -364,6 +364,7 @@ static int acpi_smbus_cmi_add(struct acpi_device *device)
 {
 	struct acpi_smbus_cmi *smbus_cmi;
 	const struct acpi_device_id *id;
+	int ret;
 
 	smbus_cmi = kzalloc(sizeof(struct acpi_smbus_cmi), GFP_KERNEL);
 	if (!smbus_cmi)
@@ -385,8 +386,10 @@ static int acpi_smbus_cmi_add(struct acpi_device *device)
 	acpi_walk_namespace(ACPI_TYPE_METHOD, smbus_cmi->handle, 1,
 			    acpi_smbus_cmi_query_methods, NULL, smbus_cmi, NULL);
 
-	if (smbus_cmi->cap_info == 0)
+	if (smbus_cmi->cap_info == 0) {
+		ret = -ENODEV;
 		goto err;
+	}
 
 	snprintf(smbus_cmi->adapter.name, sizeof(smbus_cmi->adapter.name),
 		"SMBus CMI adapter %s",
@@ -397,7 +400,8 @@ static int acpi_smbus_cmi_add(struct acpi_device *device)
 	smbus_cmi->adapter.class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
 	smbus_cmi->adapter.dev.parent = &device->dev;
 
-	if (i2c_add_adapter(&smbus_cmi->adapter)) {
+	ret = i2c_add_adapter(&smbus_cmi->adapter);
+	if (ret) {
 		dev_err(&device->dev, "Couldn't register adapter!\n");
 		goto err;
 	}
@@ -407,7 +411,7 @@ static int acpi_smbus_cmi_add(struct acpi_device *device)
 err:
 	kfree(smbus_cmi);
 	device->driver_data = NULL;
-	return -EIO;
+	return ret;
 }
 
 static int acpi_smbus_cmi_remove(struct acpi_device *device)
-- 
2.19.1