From: Tomas Winkler <tomas.winkler@intel.com>
Date: Thu, 23 Jul 2015 12:08:38 +0000 (+0300)
Subject: mei: bus: report if event registration failed
X-Git-Tag: v4.14-rc1~4841^2~107
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=48168f4561f479403dbd38379dc8793488a22a6a;p=platform%2Fkernel%2Flinux-rpi.git

mei: bus: report if event registration failed

If event registeration has failed, the caller should know
about it.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c
index 257e200b5..aba7688 100644
--- a/drivers/misc/mei/bus.c
+++ b/drivers/misc/mei/bus.c
@@ -256,6 +256,8 @@ void mei_cl_bus_rx_event(struct mei_cl *cl)
 int mei_cl_register_event_cb(struct mei_cl_device *cldev,
 			  mei_cl_event_cb_t event_cb, void *context)
 {
+	int ret;
+
 	if (cldev->event_cb)
 		return -EALREADY;
 
@@ -264,7 +266,9 @@ int mei_cl_register_event_cb(struct mei_cl_device *cldev,
 	cldev->event_context = context;
 	INIT_WORK(&cldev->event_work, mei_bus_event_work);
 
-	mei_cl_read_start(cldev->cl, 0, NULL);
+	ret = mei_cl_read_start(cldev->cl, 0, NULL);
+	if (ret && ret != -EBUSY)
+		return ret;
 
 	return 0;
 }