Bug#822559: efidisk: respect buffer alignment

[Leif Lindholm]

Package: grub2
Version: 2.02~beta2-36

GRUB's efidisk support does not respect the buffer alignment specified
by the UEFI block io protocol. This causes complete disk i/o failure
on platforms where this actually matters - such as with the built in
SATA controller on the ARM Juno development platform, but effectively
works only by accident anywhere else.

Upstream commit 51f375d688529b7c1819ba40188ee52b9333887c resolves this
issue. Could it be cherry-picked?

http://git.savannah.gnu.org/cgit/grub.git/commit/grub-core/disk/efi/efidisk.c?id=51f375d688529b7c1819ba40188ee52b9333887c

Regards,

Leif