serial: sh-sci: Fix TX DMA buffer flushing and workqueue races [Linux 4.4.187]

This Linux kernel change "serial: sh-sci: Fix TX DMA buffer flushing and workqueue races" is included in the Linux 4.4.187 release. This change is authored by Geert Uytterhoeven <geert+renesas [at] glider.be> on Mon Jun 24 14:35:39 2019 +0200. The commit for this change in Linux stable tree is f833783 (patch) which is from upstream commit […]