Do not allocate and send new skb if there are no listeners.
cn_netlink_send() can return -ESRCH in this case.
Signed-off-by: Evgeniy Polyakov <[EMAIL PROTECTED]>
diff --git a/Documentation/connector/connector.txt
b/Documentation/connector/connector.txt
index 57a314b..ad6e0ba 100644
--- a/Documentation/connector/connector.txt
+++ b/Documentation/connector/connector.txt
@@ -69,10 +69,11 @@ Unregisters new callback with connector
struct cb_id *id - unique connector's user identifier.
-void cn_netlink_send(struct cn_msg *msg, u32 __groups, int gfp_mask);
+int cn_netlink_send(struct cn_msg *msg, u32 __groups, int gfp_mask);
Sends message to the specified groups. It can be safely called from
-any context, but may silently fail under strong memory pressure.
+softirq context, but may silently fail under strong memory pressure.
+If there are no listeners for given group -ESRCH can be returned.
struct cn_msg * - message header(with attached data).
u32 __group - destination group.
diff --git a/drivers/connector/connector.c b/drivers/connector/connector.c
index 505677f..a693cc8 100644
--- a/drivers/connector/connector.c
+++ b/drivers/connector/connector.c
@@ -97,6 +97,9 @@ int cn_netlink_send(struct cn_msg *msg,
group = __group;
}
+ if (!netlink_has_listeners(dev->nls, group)
+ return -ESRCH;
+
size = NLMSG_SPACE(sizeof(*msg) + msg->len);
skb = alloc_skb(size, gfp_mask);
--
Evgeniy Polyakov
-
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