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| author | Brian Norris <briannorris@chromium.org> | 2018-01-19 12:24:21 -0800 |
|---|---|---|
| committer | chrome-bot <chrome-bot@chromium.org> | 2018-01-19 20:35:48 -0800 |
| commit | b00bf851cdaada874b7c66c6913d0cef0798fcbf (patch) | |
| tree | 4c53942876900dbef862085ed6b2ad537b82f31c /firmware/lib/ec_sync.c | |
| parent | e0b3841863281a3fc3b188bfbab55d401fabdc73 (diff) | |
| download | vboot-b00bf851cdaada874b7c66c6913d0cef0798fcbf.tar.gz | |
ec_sync: Commit NVRAM updates before battery cutoff
Battery cutoff may cause the entire system to lose power, which means
that any uncommitted nvram updates will be lost. This can leave us in a
battery cutoff loop, where we never completely clear the
BATTERY_CUTOFF_REQUEST flag before actually cutting off power.
The only way to escape this potential cutoff loop is if we manage to
cleanly exit to vb2_kernel_cleanup(), where we perform a similar commit.
But this requires us to retain power for some time after
VbExEcBatteryCutOff().
BRANCH=none
BUG=b:70176744
TEST=`crossystem battery_cutoff_request=1` on scarlet, then reboot;
see battery cutoff; plug in AC and observe whether we reliably boot
on first attach
Change-Id: I1acf3aaeaf76f97f7603f79dbfef7a24a96f36dc
Signed-off-by: Brian Norris <briannorris@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/876783
Reviewed-by: Philip Chen <philipchen@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Diffstat (limited to 'firmware/lib/ec_sync.c')
| -rw-r--r-- | firmware/lib/ec_sync.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/firmware/lib/ec_sync.c b/firmware/lib/ec_sync.c index d63ce4b7..83ad8025 100644 --- a/firmware/lib/ec_sync.c +++ b/firmware/lib/ec_sync.c @@ -473,6 +473,8 @@ VbError_t ec_sync_phase3(struct vb2_context *ctx) if (vb2_nv_get(ctx, VB2_NV_BATTERY_CUTOFF_REQUEST)) { VB2_DEBUG("Request to cut-off battery\n"); vb2_nv_set(ctx, VB2_NV_BATTERY_CUTOFF_REQUEST, 0); + /* May lose power immediately, so commit our update now. */ + vb2_nv_commit(ctx); VbExEcBatteryCutOff(); return VBERROR_SHUTDOWN_REQUESTED; } |