mfd: cros_ec_dev: Register shutdown function for debugfs

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.

This patch registers a shutdown callback used to cancel the debugfs log
worker thread.

Signed-off-by: Daniel Hung-yu Wu <hywu@chromium.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
index a393b3c11aa068c3612a7801b41b27f265bcbed3..1f889523885d4a873a509b126f0ef30aa7fb700f 100644 (file)
--- a/drivers/mfd/cros_ec_dev.c
+++ b/drivers/mfd/cros_ec_dev.c
@@ -472,6 +472,14 @@ 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 const struct platform_device_id cros_ec_id[] = {
        { DRV_NAME, 0 },
        { /* sentinel */ },
@@ -514,6 +522,7 @@ 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)