[PATCH] CHROMIUM: ec: register shutdown function to clear delayed works

From: Daniel Hung-yu Wu
Date: Mon Oct 24 2016 - 03:53:15 EST


This patch applies on top of "mfd: cros_ec: Add EC console read structures
definitions" (https://patchwork.kernel.org/patch/9294887/).

This patch is currently against a linux 3.18 kernel.

Reboot or shutdown during delayed works could corrupt communication with EC,
and certain I2C controller may not be able to recover from the error state.
A shutdown function is registered to clear delayed works or wait for them to
finish.

Signed-off-by: Daniel Hung-yu Wu <hywu@xxxxxxxxxxxx>
---
drivers/mfd/cros_ec_dev.c | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
index 8618a7c..3e548f1 100644
--- a/drivers/mfd/cros_ec_dev.c
+++ b/drivers/mfd/cros_ec_dev.c
@@ -613,6 +613,14 @@ static int ec_device_remove(struct platform_device *pdev)
return 0;
}

+static void ec_device_shutdown(struct platform_device *pdev)
+{
+ struct cros_ec_dev *ec = dev_get_drvdata(&pdev->dev);
+
+ /* Be sure to clear up debugfs delayed works */
+ cros_ec_debugfs_remove(ec);
+}
+
static int ec_device_suspend(struct device *dev)
{
struct cros_ec_dev *ec = dev_get_drvdata(dev);
@@ -656,6 +664,7 @@ static struct platform_driver cros_ec_dev_driver = {
},
.probe = ec_device_probe,
.remove = ec_device_remove,
+ .shutdown = ec_device_shutdown,
};

static int __init cros_ec_dev_init(void)
--
2.8.0.rc3.226.g39d4020