mfd: ab8500-debug: Convert to kstrtoul_from_user

Use kstrtoul_from_user for getting an unsigned long from userspace
which is less error prone.

Signed-off-by: srinidhi kasagar <srinidhi.kasagar@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Reviewed-by: Jonas ABERG <jonas.aberg@stericsson.com>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 30 insertions, 70 deletions

diff --git a/drivers/mfd/ab8500-debugfs.c b/drivers/mfd/ab8500-debugfs.c
index 810ac6faabba..e33c1628c65b 100644
--- a/drivers/mfd/ab8500-debugfs.c
+++ b/drivers/mfd/ab8500-debugfs.c
@@ -1479,7 +1479,6 @@ static ssize_t ab8500_bank_write(struct file *file,
         unsigned long user_bank;
         int err;
 
-        /* Get userspace string and assure termination */
         err = kstrtoul_from_user(user_buf, count, 0, &user_bank);
         if (err)
                 return err;
@@ -1512,7 +1511,6 @@ static ssize_t ab8500_address_write(struct file *file,
         unsigned long user_address;
         int err;
 
-        /* Get userspace string and assure termination */
         err = kstrtoul_from_user(user_buf, count, 0, &user_address);
         if (err)
                 return err;
@@ -1522,6 +1520,7 @@ static ssize_t ab8500_address_write(struct file *file,
                 return -EINVAL;
         }
         debug_address = user_address;
+
         return count;
 }
 
@@ -1556,7 +1555,6 @@ static ssize_t ab8500_val_write(struct file *file,
         unsigned long user_val;
         int err;
 
-        /* Get userspace string and assure termination */
         err = kstrtoul_from_user(user_buf, count, 0, &user_val);
         if (err)
                 return err;
@@ -2418,20 +2416,13 @@ static ssize_t ab8500_gpadc_avg_sample_write(struct file *file,
         size_t count, loff_t *ppos)
 {
         struct device *dev = ((struct seq_file *)(file->private_data))->private;
-        char buf[32];
-        int buf_size;
         unsigned long user_avg_sample;
         int err;
 
-        /* Get userspace string and assure termination */
-        buf_size = min(count, (sizeof(buf) - 1));
-        if (copy_from_user(buf, user_buf, buf_size))
-                return -EFAULT;
-        buf[buf_size] = 0;
-
-        err = strict_strtoul(buf, 0, &user_avg_sample);
+        err = kstrtoul_from_user(user_buf, count, 0, &user_avg_sample);
         if (err)
-                return -EINVAL;
+                return err;
+
         if ((user_avg_sample == SAMPLE_1) || (user_avg_sample == SAMPLE_4)
                         || (user_avg_sample == SAMPLE_8)
                         || (user_avg_sample == SAMPLE_16)) {
@@ -2441,7 +2432,8 @@ static ssize_t ab8500_gpadc_avg_sample_write(struct file *file,
                         "should be egal to 1, 4, 8 or 16\n");
                 return -EINVAL;
         }
-        return buf_size;
+
+        return count;
 }
 
 static const struct file_operations ab8500_gpadc_avg_sample_fops = {
@@ -2469,20 +2461,13 @@ static ssize_t ab8500_gpadc_trig_edge_write(struct file *file,
         size_t count, loff_t *ppos)
 {
         struct device *dev = ((struct seq_file *)(file->private_data))->private;
-        char buf[32];
-        int buf_size;
         unsigned long user_trig_edge;
         int err;
 
-        /* Get userspace string and assure termination */
-        buf_size = min(count, (sizeof(buf) - 1));
-        if (copy_from_user(buf, user_buf, buf_size))
-                return -EFAULT;
-        buf[buf_size] = 0;
-
-        err = strict_strtoul(buf, 0, &user_trig_edge);
+        err = kstrtoul_from_user(user_buf, count, 0, &user_trig_edge);
         if (err)
-                return -EINVAL;
+                return err;
+
         if ((user_trig_edge == RISING_EDGE)
                         || (user_trig_edge == FALLING_EDGE)) {
                 trig_edge = (u8) user_trig_edge;
@@ -2492,7 +2477,8 @@ static ssize_t ab8500_gpadc_trig_edge_write(struct file *file,
                         "Enter 1. Falling edge\n");
                 return -EINVAL;
         }
-        return buf_size;
+
+        return count;
 }
 
 static const struct file_operations ab8500_gpadc_trig_edge_fops = {
@@ -2520,20 +2506,13 @@ static ssize_t ab8500_gpadc_trig_timer_write(struct file *file,
         size_t count, loff_t *ppos)
 {
         struct device *dev = ((struct seq_file *)(file->private_data))->private;
-        char buf[32];
-        int buf_size;
         unsigned long user_trig_timer;
         int err;
 
-        /* Get userspace string and assure termination */
-        buf_size = min(count, (sizeof(buf) - 1));
-        if (copy_from_user(buf, user_buf, buf_size))
-                return -EFAULT;
-        buf[buf_size] = 0;
-
-        err = strict_strtoul(buf, 0, &user_trig_timer);
+        err = kstrtoul_from_user(user_buf, count, 0, &user_trig_timer);
         if (err)
-                return -EINVAL;
+                return err;
+
         if ((user_trig_timer >= 0) && (user_trig_timer <= 255)) {
                 trig_timer = (u8) user_trig_timer;
         } else {
@@ -2541,7 +2520,8 @@ static ssize_t ab8500_gpadc_trig_timer_write(struct file *file,
                         "should be beetween 0 to 255\n");
                 return -EINVAL;
         }
-        return buf_size;
+
+        return count;
 }
 
 static const struct file_operations ab8500_gpadc_trig_timer_fops = {
@@ -2569,20 +2549,13 @@ static ssize_t ab8500_gpadc_conv_type_write(struct file *file,
         size_t count, loff_t *ppos)
 {
         struct device *dev = ((struct seq_file *)(file->private_data))->private;
-        char buf[32];
-        int buf_size;
         unsigned long user_conv_type;
         int err;
 
-        /* Get userspace string and assure termination */
-        buf_size = min(count, (sizeof(buf) - 1));
-        if (copy_from_user(buf, user_buf, buf_size))
-                return -EFAULT;
-        buf[buf_size] = 0;
-
-        err = strict_strtoul(buf, 0, &user_conv_type);
+        err = kstrtoul_from_user(user_buf, count, 0, &user_conv_type);
         if (err)
-                return -EINVAL;
+                return err;
+
         if ((user_conv_type == ADC_SW)
                         || (user_conv_type == ADC_HW)) {
                 conv_type = (u8) user_conv_type;
@@ -2592,7 +2565,8 @@ static ssize_t ab8500_gpadc_conv_type_write(struct file *file,
                         "Enter 1. ADC HW conversion\n");
                 return -EINVAL;
         }
-        return buf_size;
+
+        return count;
 }
 
 static const struct file_operations ab8500_gpadc_conv_type_fops = {
@@ -2809,21 +2783,14 @@ static ssize_t ab8500_subscribe_write(struct file *file,
                                       size_t count, loff_t *ppos)
 {
         struct device *dev = ((struct seq_file *)(file->private_data))->private;
-        char buf[32];
-        int buf_size;
         unsigned long user_val;
         int err;
         unsigned int irq_index;
 
-        /* Get userspace string and assure termination */
-        buf_size = min(count, (sizeof(buf)-1));
-        if (copy_from_user(buf, user_buf, buf_size))
-                return -EFAULT;
-        buf[buf_size] = 0;
-
-        err = strict_strtoul(buf, 0, &user_val);
+        err = kstrtoul_from_user(user_buf, count, 0, &user_val);
         if (err)
-                return -EINVAL;
+                return err;
+
         if (user_val < irq_first) {
                 dev_err(dev, "debugfs error input < %d\n", irq_first);
                 return -EINVAL;
@@ -2843,7 +2810,7 @@ static ssize_t ab8500_subscribe_write(struct file *file,
          */
         dev_attr[irq_index] = kmalloc(sizeof(struct device_attribute),
                 GFP_KERNEL);
-        event_name[irq_index] = kmalloc(buf_size, GFP_KERNEL);
+        event_name[irq_index] = kmalloc(count, GFP_KERNEL);
         sprintf(event_name[irq_index], "%lu", user_val);
         dev_attr[irq_index]->show = show_irq;
         dev_attr[irq_index]->store = NULL;
@@ -2865,7 +2832,7 @@ static ssize_t ab8500_subscribe_write(struct file *file,
                 return err;
         }
 
-        return buf_size;
+        return count;
 }
 
 static ssize_t ab8500_unsubscribe_write(struct file *file,
@@ -2873,21 +2840,14 @@ static ssize_t ab8500_unsubscribe_write(struct file *file,
                                         size_t count, loff_t *ppos)
 {
         struct device *dev = ((struct seq_file *)(file->private_data))->private;
-        char buf[32];
-        int buf_size;
         unsigned long user_val;
         int err;
         unsigned int irq_index;
 
-        /* Get userspace string and assure termination */
-        buf_size = min(count, (sizeof(buf)-1));
-        if (copy_from_user(buf, user_buf, buf_size))
-                return -EFAULT;
-        buf[buf_size] = 0;
-
-        err = strict_strtoul(buf, 0, &user_val);
+        err = kstrtoul_from_user(user_buf, count, 0, &user_val);
         if (err)
-                return -EINVAL;
+                return err;
+
         if (user_val < irq_first) {
                 dev_err(dev, "debugfs error input < %d\n", irq_first);
                 return -EINVAL;
@@ -2912,7 +2872,7 @@ static ssize_t ab8500_unsubscribe_write(struct file *file,
         kfree(event_name[irq_index]);
         kfree(dev_attr[irq_index]);
 
-        return buf_size;
+        return count;
 }
 
 /*