From: Tomas Winkler Date: Sun, 7 Feb 2016 20:46:50 +0000 (+0200) Subject: watchdog: mei_wdt: re-register device on event X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=3a20a5c339cce042e53557be067e121e4e984adf;p=linux-beck.git watchdog: mei_wdt: re-register device on event For Intel SKL platform the ME device can inform the host via asynchronous notification that the watchdog feature was activated on the device. The activation doesn't require reboot. In that case the driver registers the watchdog device with the kernel. Reviewed-by: Guenter Roeck Signed-off-by: Tomas Winkler Signed-off-by: Alexander Usyskin Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/watchdog/mei_wdt.c b/drivers/watchdog/mei_wdt.c index b93474ec34a1..630bd189f167 100644 --- a/drivers/watchdog/mei_wdt.c +++ b/drivers/watchdog/mei_wdt.c @@ -481,6 +481,21 @@ out: complete(&wdt->response); } +/* + * mei_wdt_notify_event - callback for event notification + * + * @cldev: bus device + */ +static void mei_wdt_notify_event(struct mei_cl_device *cldev) +{ + struct mei_wdt *wdt = mei_cldev_get_drvdata(cldev); + + if (wdt->state != MEI_WDT_NOT_REQUIRED) + return; + + mei_wdt_register(wdt); +} + /** * mei_wdt_event - callback for event receive * @@ -493,6 +508,9 @@ static void mei_wdt_event(struct mei_cl_device *cldev, { if (events & BIT(MEI_CL_EVENT_RX)) mei_wdt_event_rx(cldev); + + if (events & BIT(MEI_CL_EVENT_NOTIF)) + mei_wdt_notify_event(cldev); } #if IS_ENABLED(CONFIG_DEBUG_FS) @@ -605,9 +623,15 @@ static int mei_wdt_probe(struct mei_cl_device *cldev, goto err_out; } - ret = mei_cldev_register_event_cb(wdt->cldev, BIT(MEI_CL_EVENT_RX), + ret = mei_cldev_register_event_cb(wdt->cldev, + BIT(MEI_CL_EVENT_RX) | + BIT(MEI_CL_EVENT_NOTIF), mei_wdt_event, NULL); - if (ret) { + + /* on legacy devices notification is not supported + * this doesn't fail the registration for RX event + */ + if (ret && ret != -EOPNOTSUPP) { dev_err(&cldev->dev, "Could not register event ret=%d\n", ret); goto err_disable; }