debugfs: Re-use kstrtobool_from_user()

Re-use kstrtobool_from_user() instead of open coded variant.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 2 insertions, 8 deletions

diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
index 1f99678ff5d3..4fce1da7db23 100644
--- a/fs/debugfs/file.c
+++ b/fs/debugfs/file.c
@@ -796,19 +796,13 @@ EXPORT_SYMBOL_GPL(debugfs_read_file_bool);
 ssize_t debugfs_write_file_bool(struct file *file, const char __user *user_buf,
                                 size_t count, loff_t *ppos)
 {
-        char buf[32];
-        size_t buf_size;
         bool bv;
         int r;
         bool *val = file->private_data;
         struct dentry *dentry = F_DENTRY(file);
 
-        buf_size = min(count, (sizeof(buf)-1));
-        if (copy_from_user(buf, user_buf, buf_size))
-                return -EFAULT;
-
-        buf[buf_size] = '\0';
-        if (strtobool(buf, &bv) == 0) {
+        r = kstrtobool_from_user(user_buf, count, &bv);
+        if (!r) {
                 r = debugfs_file_get(dentry);
                 if (unlikely(r))
                         return r;