From: K. Y. Srinivasan <kys@microsoft.com>
Date: Sat, 27 Aug 2011 18:31:32 +0000 (-0700)
Subject: Staging: hv: vmbus: Check before invoking the channel callback
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=76c39d429d606d8f9b354ee2b1973b76c8331b1f;p=deliverable%2Flinux.git

Staging: hv: vmbus: Check before invoking the channel callback

When we close a channel, we set the corresponding callback function to NULL.
Check before invoking the channel callback.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/staging/hv/connection.c b/drivers/staging/hv/connection.c
index a88ad7072566..7a3ec75bab18 100644
--- a/drivers/staging/hv/connection.c
+++ b/drivers/staging/hv/connection.c
@@ -222,7 +222,7 @@ static void process_chn_event(u32 relid)
 	 */
 	channel = relid2channel(relid);
 
-	if (channel) {
+	if (channel && (channel->onchannel_callback != NULL)) {
 		channel->onchannel_callback(channel->channel_callback_context);
 	} else {
 		pr_err("channel not found for relid - %u\n", relid);