Patch "um: ubd: Fix for processes stuck in D state forever" has been added to the 3.14-stable tree

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This is a note to let you know that I've just added the patch titled

    um: ubd: Fix for processes stuck in D state forever

to the 3.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     um-ubd-fix-for-processes-stuck-in-d-state-forever.patch
and it can be found in the queue-3.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 2a2361228c5e6d8c1733f00653481de918598e50 Mon Sep 17 00:00:00 2001
From: Thorsten Knabe <linux@xxxxxxxxxxxxxxxxx>
Date: Sat, 23 Aug 2014 15:47:38 +0200
Subject: um: ubd: Fix for processes stuck in D state forever

From: Thorsten Knabe <linux@xxxxxxxxxxxxxxxxx>

commit 2a2361228c5e6d8c1733f00653481de918598e50 upstream.

Starting with Linux 3.12 processes get stuck in D state forever in
UserModeLinux under sync heavy workloads. This bug was introduced by
commit 805f11a0d5 (um: ubd: Add REQ_FLUSH suppport).
Fix bug by adding a check if FLUSH request was successfully submitted to
the I/O thread and keeping the FLUSH request on the request queue on
submission failures.

Fixes: 805f11a0d5 (um: ubd: Add REQ_FLUSH suppport)
Signed-off-by: Thorsten Knabe <linux@xxxxxxxxxxxxxxxxx>
Signed-off-by: Richard Weinberger <richard@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 arch/um/drivers/ubd_kern.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -1277,7 +1277,7 @@ static void do_ubd_request(struct reques
 
 	while(1){
 		struct ubd *dev = q->queuedata;
-		if(dev->end_sg == 0){
+		if(dev->request == NULL){
 			struct request *req = blk_fetch_request(q);
 			if(req == NULL)
 				return;
@@ -1299,7 +1299,8 @@ static void do_ubd_request(struct reques
 				return;
 			}
 			prepare_flush_request(req, io_req);
-			submit_request(io_req, dev);
+			if (submit_request(io_req, dev) == false)
+				return;
 		}
 
 		while(dev->start_sg < dev->end_sg){


Patches currently in stable-queue which might be from linux@xxxxxxxxxxxxxxxxx are

queue-3.14/um-ubd-fix-for-processes-stuck-in-d-state-forever.patch
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