regmap: debugfs: Check return value of regmap_write()

Signed-off-by: NDimitris Papastamos <dp@opensource.wolfsonmicro.com>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

drivers/base/regmap/regmap-debugfs.c

@@ -265,6 +265,7 @@ static ssize_t regmap_map_write_file(struct file *file,
 	char *start = buf;
 	unsigned long reg, value;
 	struct regmap *map = file->private_data;
+	int ret;
 
 	buf_size = min(count, (sizeof(buf)-1));
 	if (copy_from_user(buf, user_buf, buf_size))
@@ -282,7 +283,9 @@ static ssize_t regmap_map_write_file(struct file *file,
 	/* Userspace has been fiddling around behind the kernel's back */
 	add_taint(TAINT_USER, LOCKDEP_NOW_UNRELIABLE);
 
-	regmap_write(map, reg, value);
+	ret = regmap_write(map, reg, value);
+	if (ret < 0)
+		return ret;
 	return buf_size;
 }
 #else