Changed the documentation to allow sprintf() for small single values and explicitly say snprintf() must never be used in a show function to format data to be returned to user space. Change based on a discussion about the patch st: convert DRIVER_ATTR macros to DRIVER_ATTR_RO Suggested-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Shane Seymour <shane.seymour@xxxxxx> --- --- a/Documentation/filesystems/sysfs.txt 2015-06-22 14:18:40.278620871 -0500 +++ b/Documentation/filesystems/sysfs.txt 2015-06-24 13:42:21.344446532 -0500 @@ -212,7 +212,9 @@ Other notes: - show() methods should return the number of bytes printed into the buffer. This is the return value of scnprintf(). -- show() should always use scnprintf(). +- show() must not use snprintf() when formatting a value to be + returned to user space. For small single values you can use + sprintf() otherwise you must use scnprintf(). - store() should return the number of bytes used from the buffer. If the entire buffer has been used, just return the count argument. -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
