Patrick Georgi has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/37044 )
Change subject: drivers/spi/boot_device_rw_nommap.c: Drop CAR_GLOBAL_MIGRATION support ......................................................................
Patch Set 7:
(1 comment)
https://review.coreboot.org/c/coreboot/+/37044/7/src/drivers/spi/boot_device... File src/drivers/spi/boot_device_rw_nommap.c:
https://review.coreboot.org/c/coreboot/+/37044/7/src/drivers/spi/boot_device... PS7, Line 28: if (sf == NULL)
To me it appeared sfg_init_done acts as the guard.
Ack