device: protect device event broadcast against simultaneous deletions of multiple receivers in the callback (can happen with aliases)

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/device.h b/device.h
index 8cedfba..1f852ab 100644
--- a/device.h
+++ b/device.h
@@ -75,6 +75,8 @@ enum device_event {
 
 	DEV_EVENT_LINK_UP,
 	DEV_EVENT_LINK_DOWN,
+
+	__DEV_EVENT_MAX
 };
 
 /*
@@ -87,6 +89,8 @@ struct device_user {
 	bool hotplug;
 	bool alias;
 
+	uint8_t ev_idx[__DEV_EVENT_MAX];
+
 	struct device *dev;
 	void (*cb)(struct device_user *, enum device_event);
 };