Patch "IB/core: Protect against self-requeue of a cq work item" has been added to the 4.9-stable tree

[<gregkh@linuxfoundation.org>]

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

    IB/core: Protect against self-requeue of a cq work item

to the 4.9-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:
     ib-core-protect-against-self-requeue-of-a-cq-work-item.patch
and it can be found in the queue-4.9 subdirectory.

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


>From foo@baz Thu Dec 21 09:02:40 CET 2017
From: Sagi Grimberg <sagi@grimberg.me>
Date: Wed, 8 Mar 2017 22:00:52 +0200
Subject: IB/core: Protect against self-requeue of a cq work item

From: Sagi Grimberg <sagi@grimberg.me>


[ Upstream commit 86f46aba8d1ac3ed0904542158a9b9cb9c7a143c ]

We need to make sure that the cq work item does not
run when we are destroying the cq. Unlike flush_work,
cancel_work_sync protects against self-requeue of the
work item (which we can do in ib_cq_poll_work).

Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>--
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/infiniband/core/cq.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/infiniband/core/cq.c
+++ b/drivers/infiniband/core/cq.c
@@ -196,7 +196,7 @@ void ib_free_cq(struct ib_cq *cq)
 		irq_poll_disable(&cq->iop);
 		break;
 	case IB_POLL_WORKQUEUE:
-		flush_work(&cq->work);
+		cancel_work_sync(&cq->work);
 		break;
 	default:
 		WARN_ON_ONCE(1);


Patches currently in stable-queue which might be from sagi@grimberg.me are

queue-4.9/nvme-loop-handle-cpu-unplug-when-re-establishing-the-controller.patch
queue-4.9/ib-core-protect-against-self-requeue-of-a-cq-work-item.patch
queue-4.9/rdma-iser-fix-possible-mr-leak-on-device-removal-event.patch