This code was originally under a Samsung proprietary license
exfat_version.h:/* — 2012.04.02: P1: Change Module License to Samsung Proprietary */
this is version p2. I could've technically stripped those comments and changed the version number to /* — 2012.02.10: Release Version 1.1.0 */ But I didn't. Originally, it was either public domain or GPL.
/* — 2013.07.22: 1.1.4: Change Module License to Samsung Proprietary */
...So it appears the «Samsung Proprietary code» contains GPLv2 copied straight from Linux kernel.