[PATCH] drivers/cros_ec: Emergency sync filesystem on EC panic

[Rob Barnes <robbarnes@google.com>]

Perform an emergency filesystem sync when an EC panic is reported. An
emergency sync actually performs two syncs internally in case some
inodes or pages are temporarily locked.

hw_protection_shutdown is replaced for a few reasons. It is unnecessary
because the EC will force reset either way. hw_protection_shutdown does
not reliably sync filesystem before shutting down. emergency_sync is not
synchronous so hw_protection_shutdown may interrupt emergency_sync.

Signed-off-by: Rob Barnes <robbarnes@google.com>
---

 drivers/platform/chrome/cros_ec_lpc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec_lpc.c b/drivers/platform/chrome/cros_ec_lpc.c
index 500a61b093e47..9652fc073c2a4 100644
--- a/drivers/platform/chrome/cros_ec_lpc.c
+++ b/drivers/platform/chrome/cros_ec_lpc.c
@@ -327,8 +327,8 @@ static void cros_ec_lpc_acpi_notify(acpi_handle device, u32 value, void *data)
 		dev_emerg(ec_dev->dev, "CrOS EC Panic Reported. Shutdown is imminent!");
 		blocking_notifier_call_chain(&ec_dev->panic_notifier, 0, ec_dev);
 		kobject_uevent_env(&ec_dev->dev->kobj, KOBJ_CHANGE, (char **)env);
-		/* Begin orderly shutdown. Force shutdown after 1 second. */
-		hw_protection_shutdown("CrOS EC Panic", 1000);
+		/* Force sync the filesystem before EC resets */
+		emergency_sync();
 		/* Do not query for other events after a panic is reported */
 		return;
 	}
-- 
2.41.0.255.g8b1d071c50-goog