[M] Change in flashrom[master]: flashrom: only perform WP unlock for write/erase operations

[Nikolai Artemiev (Code Review)]

Attention is currently required from: Brian Norris, Nikolai Artemiev.

Hello Brian Norris, Edward O'Callaghan, build bot (Jenkins),

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/flashrom/+/75991?usp=email

to look at the new patch set (#3).

Change subject: flashrom: only perform WP unlock for write/erase operations
......................................................................

flashrom: only perform WP unlock for write/erase operations

Don't unlock using WP for read/verify operations because WP will only
disable write locks. Most chips don't have read locks anyway, but some
do, so we still call the chip's unlock function for read/verify
operations.

Unconditionally unlocking using WP slows down flashrom significantly
with some programmers, particularly linux_mtd due to inefficiency in the
current kernel MTD interface.

BUG=b:283779258
BRANCH=none
TEST=`ninja test`
TEST=`flashrom -{r,w,E,v}` on strongbad
TEST=`flashrom --wp-enable; flashrom -{w,E}` on strongbad

Change-Id: I5dc66474a0b7969b51b86ac9f5daa2c95ae968f1
Signed-off-by: Nikolai Artemiev 
---
M flashrom.c
1 file changed, 42 insertions(+), 11 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/91/75991/3