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flashrom: initialize restore func count in correct place

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Set `flash->chip_restore_fn_count` to zero before calling the chip's
unlock funciton in `prepare_flash_access()`.

Previously `flash->chip_restore_fn_count` was uninitialized before
calling `chip->unlock()` and subsequently reset after the dispatch by
initializing it. This caused the restore handler that is registered
within `spi_disable_blockprotect_generic()` to be lost.

BUG=b:228945411
BRANCH=none
TEST=enable wp; flashrom -w; check wp still enabled.

Change-Id: I4c7df424bd2ae2b5fb2a2ab6b47a3c9ff3233acf
Signed-off-by: Nikolai Artemiev <nartemiev@google.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/63881
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
This commit is contained in:
Nikolai Artemiev 2022-04-27 10:24:10 +10:00 committed by Edward O'Callaghan
parent 6f781bdaea
commit b86ae179ad
1 changed files with 3 additions and 1 deletions
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4
flashrom.c
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@ -1825,6 +1825,9 @@ int prepare_flash_access(struct flashctx *const flash,
if (map_flash(flash) != 0)
return 1;
/* Initialize chip_restore_fn_count before chip unlock calls. */
flash->chip_restore_fn_count = 0;
/* Given the existence of read locks, we want to unlock for read,
erase and write. */
if (flash->chip->unlock)
@ -1832,7 +1835,6 @@ int prepare_flash_access(struct flashctx *const flash,
flash->address_high_byte = -1;
flash->in_4ba_mode = false;
flash->chip_restore_fn_count = 0;
/* Be careful about 4BA chips and broken masters */
if (flash->chip->total_size > 16 * 1024 && spi_master_no_4ba_modes(flash)) {