This reverts commit 32cf1a12ca.
The 'exisitng buffer' in this case is the firmware provided table, and
we should not modify that in place. This fixes a crash on arm64 with
initrd table overrides, in which case the DSDT is not mapped with
read/write permissions.
Reported-by: Shawn Guo <[email protected]>
Signed-off-by: Ard Biesheuvel <[email protected]>
Tested-by: Shawn Guo <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>