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@gmail.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
[andy: updated due to previous patch changed]
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

diff --git a/drivers/platform/x86/silead_dmi.c b/drivers/platform/x86/silead_dmi.c
index 7564cc6..3ff70ae 100644 (file)
--- a/drivers/platform/x86/silead_dmi.c
+++ b/drivers/platform/x86/silead_dmi.c
@@ -96,21 +96,16 @@ 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)
 {
        struct device *dev = &client->dev;
-       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(dev) &&
-           !strncmp(ts_data->acpi_name, client->name, I2C_NAME_SIZE)) {
-               error = device_add_properties(dev, ts_data->properties);
+           !strncmp(silead_ts_data->acpi_name, client->name, I2C_NAME_SIZE)) {
+               error = device_add_properties(dev, silead_ts_data->properties);
                if (error)
                        dev_err(dev, "failed to add properties: %d\n", error);
        }
@@ -142,8 +137,15 @@ 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",