linux-kernel - [PATCH] kdbus: do not append the same connection to the queue twice

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Date:	Mon, 13 Apr 2015 16:14:06 +0200
From:	Lukasz Skalski <l.skalski@...sung.com>
To:	gregkh@...uxfoundation.org, daniel@...que.org,
	dh.herrmann@...il.com, tixxdz@...ndz.org
Cc:	linux-kernel@...r.kernel.org,
	Lukasz Skalski <l.skalski@...sung.com>
Subject: [PATCH] kdbus: do not append the same connection to the queue twice

As it was discussed on systemd ML [1], the same connection should be
queued up only once for a given well-known name.

[1] http://lists.freedesktop.org/archives/systemd-devel/2015-April/030494.html

Signed-off-by: Lukasz Skalski <l.skalski@...sung.com>

diff --git a/ipc/kdbus/names.c b/ipc/kdbus/names.c
index 657008e..a546a84 100644
--- a/ipc/kdbus/names.c
+++ b/ipc/kdbus/names.c
@@ -353,10 +353,23 @@ int kdbus_name_acquire(struct kdbus_name_registry *reg,
 	} else if (flags & KDBUS_NAME_QUEUE) {
 		/* add to waiting-queue of the name */
 
-		ret = kdbus_name_pending_new(e, conn, flags);
-		if (ret >= 0)
-			/* tell the caller that we queued it */
-			rflags |= KDBUS_NAME_IN_QUEUE;
+		struct kdbus_name_pending *p;
+		bool in_queue = false;
+
+		list_for_each_entry(p, &e->queue, name_entry) {
+			if (p->conn == conn) {
+				/* connection is already queued */
+				rflags |= KDBUS_NAME_IN_QUEUE;
+				in_queue = true;
+			}
+		}
+
+		if (!in_queue) {
+			ret = kdbus_name_pending_new(e, conn, flags);
+			if (ret >= 0)
+				/* tell the caller that we queued it */
+				rflags |= KDBUS_NAME_IN_QUEUE;
+		}
 	} else {
 		/* the name is busy, return a failure */
 		ret = -EEXIST;
-- 
1.9.3

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