linux-kernel - [PATCH 2/2] platform/x86: silead_dmi - abort early if DMI does not match

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Date:   Mon,  3 Apr 2017 20:25:14 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] platform/x86: silead_dmi - abort early if DMI does not match

There is no point in registering I2C bus notifier if DMI data does not
match.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
---
 drivers/platform/x86/silead_dmi.c | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/drivers/platform/x86/silead_dmi.c b/drivers/platform/x86/silead_dmi.c
index 7f1049951d1c..0eeb49e51c43 100644
--- a/drivers/platform/x86/silead_dmi.c
+++ b/drivers/platform/x86/silead_dmi.c
@@ -75,21 +75,16 @@ static const struct dmi_system_id silead_ts_dmi_table[] = {
 	{ },
 };
 
+static const struct silead_ts_dmi_data *silead_ts_data;
+
 static void silead_ts_dmi_add_props(struct i2c_client *client)
 {
-	const struct dmi_system_id *dmi_id;
-	const struct silead_ts_dmi_data *ts_data;
 	int error;
 
-	dmi_id = dmi_first_match(silead_ts_dmi_table);
-	if (!dmi_id)
-		return;
-
-	ts_data = dmi_id->driver_data;
 	if (has_acpi_companion(&client->dev) &&
-	    !strncmp(ts_data->acpi_name, client->name, I2C_NAME_SIZE)) {
+	    !strncmp(silead_ts_data->acpi_name, client->name, I2C_NAME_SIZE)) {
 		error = device_add_properties(&client->dev,
-					      ts_data->properties);
+					      silead_ts_data->properties);
 		if (error)
 			dev_err(&client->dev,
 				"failed to add properties: %d\n", error);
@@ -122,8 +117,15 @@ static struct notifier_block silead_ts_dmi_notifier = {
 
 static int __init silead_ts_dmi_init(void)
 {
+	const struct dmi_system_id *dmi_id;
 	int error;
 
+	dmi_id = dmi_first_match(silead_ts_dmi_table);
+	if (!dmi_id)
+		return 0; /* Not an error */
+
+	silead_ts_data = dmi_id->driver_data;
+
 	error = bus_register_notifier(&i2c_bus_type, &silead_ts_dmi_notifier);
 	if (error)
 		pr_err("%s: failed to register i2c bus notifier: %d\n",
-- 
2.12.2.715.g7642488e1d-goog