Imported linux-2.6.27.39 suse/xen patches.

[people/pmueller/ipfire-2.x.git] / src / patches / suse-2.6.27.31 / patches.arch / s390-13-01-af_iucv-fix-race-msgpending.patch

diff --git a/src/patches/suse-2.6.27.31/patches.arch/s390-13-01-af_iucv-fix-race-msgpending.patch b/src/patches/suse-2.6.27.31/patches.arch/s390-13-01-af_iucv-fix-race-msgpending.patch
deleted file mode 100644 (file)
index 75d0dc9..0000000
--- a/src/patches/suse-2.6.27.31/patches.arch/s390-13-01-af_iucv-fix-race-msgpending.patch
+++ /dev/null
@@ -1,58 +0,0 @@
-From: Gerald Schaefer <geraldsc@de.ibm.com>
-Subject: af_iucv: Fix race when queuing incoming iucv messages
-References: bnc#499845,LTC#53033
-
-Symptom:     A socket application does not receive any new data even
-             if incoming IUCV messages are received and queued.
-Problem:     AF_IUCV runs into a race when queueing incoming iucv
-             messages and receiving the resulting backlog.
-             If the Linux system is under pressure (high load or
-             steal time), the message queue grows up, but messages
-             are not received and queued onto the backlog queue.
-             In that case, applications do not receive any data with
-             recvmsg() even if AF_IUCV puts incoming messages onto
-             the message queue.
-Solution:    The race can be avoided if the message queue
-             spinlock in the message_pending callback is
-             spreaded across the entire callback function.
-
-Acked-by: John Jolly <jjolly@suse.de>
----
- net/iucv/af_iucv.c |   10 +++++-----
- 1 file changed, 5 insertions(+), 5 deletions(-)
-
---- a/net/iucv/af_iucv.c
-+++ b/net/iucv/af_iucv.c
-@@ -1089,6 +1089,8 @@ static void iucv_callback_rx(struct iucv
-       if (sk->sk_shutdown & RCV_SHUTDOWN)
-               return;
- 
-+      spin_lock(&iucv->message_q.lock);
-+
-       if (!list_empty(&iucv->message_q.list) ||
-           !skb_queue_empty(&iucv->backlog_skb_q))
-               goto save_message;
-@@ -1102,11 +1104,8 @@ static void iucv_callback_rx(struct iucv
-       if (!skb)
-               goto save_message;
- 
--      spin_lock(&iucv->message_q.lock);
-       iucv_process_message(sk, skb, path, msg);
--      spin_unlock(&iucv->message_q.lock);
--
--      return;
-+      goto out_unlock;
- 
- save_message:
-       save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
-@@ -1115,8 +1114,9 @@ save_message:
-       save_msg->path = path;
-       save_msg->msg = *msg;
- 
--      spin_lock(&iucv->message_q.lock);
-       list_add_tail(&save_msg->list, &iucv->message_q.list);
-+
-+out_unlock:
-       spin_unlock(&iucv->message_q.lock);
- }
-