hwmon: (w83627ehf) read fan_div values during probe
This patch forces the driver to read the fan divider values during early init. Otherwise, a call to store_fan_min() could access uninitialized variables. Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com> Signed-off-by: Jean Delvare <khali@linux-fr.org>
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393cdad626
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@ -421,6 +421,31 @@ static void w83627ehf_write_fan_div(struct w83627ehf_data *data, int nr)
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}
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}
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static void w83627ehf_update_fan_div(struct w83627ehf_data *data)
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{
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int i;
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i = w83627ehf_read_value(data, W83627EHF_REG_FANDIV1);
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data->fan_div[0] = (i >> 4) & 0x03;
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data->fan_div[1] = (i >> 6) & 0x03;
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i = w83627ehf_read_value(data, W83627EHF_REG_FANDIV2);
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data->fan_div[2] = (i >> 6) & 0x03;
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i = w83627ehf_read_value(data, W83627EHF_REG_VBAT);
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data->fan_div[0] |= (i >> 3) & 0x04;
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data->fan_div[1] |= (i >> 4) & 0x04;
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data->fan_div[2] |= (i >> 5) & 0x04;
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if (data->has_fan & ((1 << 3) | (1 << 4))) {
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i = w83627ehf_read_value(data, W83627EHF_REG_DIODE);
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data->fan_div[3] = i & 0x03;
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data->fan_div[4] = ((i >> 2) & 0x03)
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| ((i >> 5) & 0x04);
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}
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if (data->has_fan & (1 << 3)) {
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i = w83627ehf_read_value(data, W83627EHF_REG_SMI_OVT);
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data->fan_div[3] |= (i >> 5) & 0x04;
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}
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}
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static struct w83627ehf_data *w83627ehf_update_device(struct device *dev)
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{
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struct w83627ehf_data *data = dev_get_drvdata(dev);
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@ -432,25 +457,7 @@ static struct w83627ehf_data *w83627ehf_update_device(struct device *dev)
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if (time_after(jiffies, data->last_updated + HZ + HZ/2)
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|| !data->valid) {
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/* Fan clock dividers */
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i = w83627ehf_read_value(data, W83627EHF_REG_FANDIV1);
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data->fan_div[0] = (i >> 4) & 0x03;
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data->fan_div[1] = (i >> 6) & 0x03;
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i = w83627ehf_read_value(data, W83627EHF_REG_FANDIV2);
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data->fan_div[2] = (i >> 6) & 0x03;
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i = w83627ehf_read_value(data, W83627EHF_REG_VBAT);
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data->fan_div[0] |= (i >> 3) & 0x04;
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data->fan_div[1] |= (i >> 4) & 0x04;
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data->fan_div[2] |= (i >> 5) & 0x04;
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if (data->has_fan & ((1 << 3) | (1 << 4))) {
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i = w83627ehf_read_value(data, W83627EHF_REG_DIODE);
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data->fan_div[3] = i & 0x03;
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data->fan_div[4] = ((i >> 2) & 0x03)
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| ((i >> 5) & 0x04);
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}
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if (data->has_fan & (1 << 3)) {
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i = w83627ehf_read_value(data, W83627EHF_REG_SMI_OVT);
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data->fan_div[3] |= (i >> 5) & 0x04;
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}
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w83627ehf_update_fan_div(data);
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/* Measured voltages and limits */
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for (i = 0; i < data->in_num; i++) {
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@ -1312,6 +1319,9 @@ static int __devinit w83627ehf_probe(struct platform_device *pdev)
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if (!(i & (1 << 1)) && (!fan5pin))
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data->has_fan |= (1 << 4);
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/* Read fan clock dividers immediately */
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w83627ehf_update_fan_div(data);
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/* Register sysfs hooks */
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for (i = 0; i < ARRAY_SIZE(sda_sf3_arrays); i++)
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if ((err = device_create_file(dev,
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