[PATCH] w83792d: Add missing data access locks

Add missing data lock in w83792d driver to avoid unexpected
data change.

Signed-off-by: Yuan Mu <ymu@winbond.com.tw>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 25 insertions, 5 deletions

diff --git a/drivers/hwmon/w83792d.c b/drivers/hwmon/w83792d.c
index 6cdef18b1b27..4ef884c216e2 100644
--- a/drivers/hwmon/w83792d.c
+++ b/drivers/hwmon/w83792d.c
@@ -372,8 +372,10 @@ static ssize_t store_in_##reg (struct device *dev, \
         u32 val; \
          \
         val = simple_strtoul(buf, NULL, 10); \
+        mutex_lock(&data->update_lock); \
         data->in_##reg[nr] = SENSORS_LIMIT(IN_TO_REG(nr, val)/4, 0, 255); \
         w83792d_write_value(client, W83792D_REG_IN_##REG[nr], data->in_##reg[nr]); \
+        mutex_unlock(&data->update_lock); \
          \
         return count; \
 }
@@ -440,9 +442,11 @@ store_fan_min(struct device *dev, struct device_attribute *attr,
         u32 val;
 
         val = simple_strtoul(buf, NULL, 10);
+        mutex_lock(&data->update_lock);
         data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
         w83792d_write_value(client, W83792D_REG_FAN_MIN[nr],
                                 data->fan_min[nr]);
+        mutex_unlock(&data->update_lock);
 
         return count;
 }
@@ -475,6 +479,7 @@ store_fan_div(struct device *dev, struct device_attribute *attr,
         u8 tmp_fan_div;
 
         /* Save fan_min */
+        mutex_lock(&data->update_lock);
         min = FAN_FROM_REG(data->fan_min[nr],
                            DIV_FROM_REG(data->fan_div[nr]));
 
@@ -490,6 +495,7 @@ store_fan_div(struct device *dev, struct device_attribute *attr,
         /* Restore fan_min */
         data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
         w83792d_write_value(client, W83792D_REG_FAN_MIN[nr], data->fan_min[nr]);
+        mutex_unlock(&data->update_lock);
 
         return count;
 }
@@ -544,10 +550,11 @@ static ssize_t store_temp1(struct device *dev, struct device_attribute *attr,
         s32 val;
 
         val = simple_strtol(buf, NULL, 10);
-
+        mutex_lock(&data->update_lock);
         data->temp1[nr] = TEMP1_TO_REG(val);
         w83792d_write_value(client, W83792D_REG_TEMP1[nr],
                 data->temp1[nr]);
+        mutex_unlock(&data->update_lock);
 
         return count;
 }
@@ -577,13 +584,14 @@ static ssize_t store_temp23(struct device *dev, struct device_attribute *attr,
         s32 val;
 
         val = simple_strtol(buf, NULL, 10);
-
+        mutex_lock(&data->update_lock);
         data->temp_add[nr][index] = TEMP_ADD_TO_REG_HIGH(val);
         data->temp_add[nr][index+1] = TEMP_ADD_TO_REG_LOW(val);
         w83792d_write_value(client, W83792D_REG_TEMP_ADD[nr][index],
                 data->temp_add[nr][index]);
         w83792d_write_value(client, W83792D_REG_TEMP_ADD[nr][index+1],
                 data->temp_add[nr][index+1]);
+        mutex_unlock(&data->update_lock);
 
         return count;
 }
@@ -682,6 +690,10 @@ store_pwmenable(struct device *dev, struct device_attribute *attr,
         u8 fan_cfg_tmp, cfg1_tmp, cfg2_tmp, cfg3_tmp, cfg4_tmp;
 
         val = simple_strtoul(buf, NULL, 10);
+        if (val < 1 || val > 3)
+                return -EINVAL;
+
+        mutex_lock(&data->update_lock);
         switch (val) {
         case 1:
                 data->pwmenable[nr] = 0; /* manual mode */
@@ -692,8 +704,6 @@ store_pwmenable(struct device *dev, struct device_attribute *attr,
         case 3:
                 data->pwmenable[nr] = 1; /* thermal cruise/Smart Fan I */
                 break;
-        default:
-                return -EINVAL;
         }
         cfg1_tmp = data->pwmenable[0];
         cfg2_tmp = (data->pwmenable[1]) << 2;
@@ -701,6 +711,7 @@ store_pwmenable(struct device *dev, struct device_attribute *attr,
         cfg4_tmp = w83792d_read_value(client,W83792D_REG_FAN_CFG) & 0xc0;
         fan_cfg_tmp = ((cfg4_tmp | cfg3_tmp) | cfg2_tmp) | cfg1_tmp;
         w83792d_write_value(client, W83792D_REG_FAN_CFG, fan_cfg_tmp);
+        mutex_unlock(&data->update_lock);
 
         return count;
 }
@@ -794,12 +805,13 @@ store_chassis_clear(struct device *dev, struct device_attribute *attr,
         u8 temp1 = 0, temp2 = 0;
 
         val = simple_strtoul(buf, NULL, 10);
-
+        mutex_lock(&data->update_lock);
         data->chassis_clear = SENSORS_LIMIT(val, 0 ,1);
         temp1 = ((data->chassis_clear) << 7) & 0x80;
         temp2 = w83792d_read_value(client,
                 W83792D_REG_CHASSIS_CLR) & 0x7f;
         w83792d_write_value(client, W83792D_REG_CHASSIS_CLR, temp1 | temp2);
+        mutex_unlock(&data->update_lock);
 
         return count;
 }
@@ -832,10 +844,12 @@ store_thermal_cruise(struct device *dev, struct device_attribute *attr,
         val = simple_strtoul(buf, NULL, 10);
         target_tmp = val;
         target_tmp = target_tmp & 0x7f;
+        mutex_lock(&data->update_lock);
         target_mask = w83792d_read_value(client, W83792D_REG_THERMAL[nr]) & 0x80;
         data->thermal_cruise[nr] = SENSORS_LIMIT(target_tmp, 0, 255);
         w83792d_write_value(client, W83792D_REG_THERMAL[nr],
                 (data->thermal_cruise[nr]) | target_mask);
+        mutex_unlock(&data->update_lock);
 
         return count;
 }
@@ -872,6 +886,7 @@ store_tolerance(struct device *dev, struct device_attribute *attr,
         u8 tol_tmp, tol_mask;
 
         val = simple_strtoul(buf, NULL, 10);
+        mutex_lock(&data->update_lock);
         tol_mask = w83792d_read_value(client,
                 W83792D_REG_TOLERANCE[nr]) & ((nr == 1) ? 0x0f : 0xf0);
         tol_tmp = SENSORS_LIMIT(val, 0, 15);
@@ -882,6 +897,7 @@ store_tolerance(struct device *dev, struct device_attribute *attr,
         }
         w83792d_write_value(client, W83792D_REG_TOLERANCE[nr],
                 tol_mask | tol_tmp);
+        mutex_unlock(&data->update_lock);
 
         return count;
 }
@@ -920,11 +936,13 @@ store_sf2_point(struct device *dev, struct device_attribute *attr,
         u8 mask_tmp = 0;
 
         val = simple_strtoul(buf, NULL, 10);
+        mutex_lock(&data->update_lock);
         data->sf2_points[index][nr] = SENSORS_LIMIT(val, 0, 127);
         mask_tmp = w83792d_read_value(client,
                                         W83792D_REG_POINTS[index][nr]) & 0x80;
         w83792d_write_value(client, W83792D_REG_POINTS[index][nr],
                 mask_tmp|data->sf2_points[index][nr]);
+        mutex_unlock(&data->update_lock);
 
         return count;
 }
@@ -984,6 +1002,7 @@ store_sf2_level(struct device *dev, struct device_attribute *attr,
         u8 mask_tmp=0, level_tmp=0;
 
         val = simple_strtoul(buf, NULL, 10);
+        mutex_lock(&data->update_lock);
         data->sf2_levels[index][nr] = SENSORS_LIMIT((val * 15) / 100, 0, 15);
         mask_tmp = w83792d_read_value(client, W83792D_REG_LEVELS[index][nr])
                 & ((nr==3) ? 0xf0 : 0x0f);
@@ -993,6 +1012,7 @@ store_sf2_level(struct device *dev, struct device_attribute *attr,
                 level_tmp = data->sf2_levels[index][nr] << 4;
         }
         w83792d_write_value(client, W83792D_REG_LEVELS[index][nr], level_tmp | mask_tmp);
+        mutex_unlock(&data->update_lock);
 
         return count;
 }