Patch "iser-target: Fix possible deadlock in RDMA_CM connection error" has been added to the 3.10-stable tree

[<gregkh@linuxfoundation.org>]

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

    iser-target: Fix possible deadlock in RDMA_CM connection error

to the 3.10-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:
     iser-target-fix-possible-deadlock-in-rdma_cm-connection-error.patch
and it can be found in the queue-3.10 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 4a579da2586bd3b79b025947ea24ede2bbfede62 Mon Sep 17 00:00:00 2001
From: Sagi Grimberg <sagig@mellanox.com>
Date: Sun, 29 Mar 2015 15:52:04 +0300
Subject: iser-target: Fix possible deadlock in RDMA_CM connection error

From: Sagi Grimberg <sagig@mellanox.com>

commit 4a579da2586bd3b79b025947ea24ede2bbfede62 upstream.

Before we reach to connection established we may get an
error event. In this case the core won't teardown this
connection (never established it), so we take care of freeing
it ourselves.

Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>


---
 drivers/infiniband/ulp/isert/ib_isert.c |   14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

--- a/drivers/infiniband/ulp/isert/ib_isert.c
+++ b/drivers/infiniband/ulp/isert/ib_isert.c
@@ -202,7 +202,7 @@ fail:
 static void
 isert_free_rx_descriptors(struct isert_conn *isert_conn)
 {
-	struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+	struct ib_device *ib_dev = isert_conn->conn_device->ib_device;
 	struct iser_rx_desc *rx_desc;
 	int i;
 
@@ -527,14 +527,15 @@ out:
 static void
 isert_connect_release(struct isert_conn *isert_conn)
 {
-	struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
 	struct isert_device *device = isert_conn->conn_device;
 	int cq_index;
+	struct ib_device *ib_dev = device->ib_device;
 
 	pr_debug("Entering isert_connect_release(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
 
 	isert_free_rx_descriptors(isert_conn);
-	rdma_destroy_id(isert_conn->conn_cm_id);
+	if (isert_conn->conn_cm_id)
+		rdma_destroy_id(isert_conn->conn_cm_id);
 
 	if (isert_conn->conn_qp) {
 		cq_index = ((struct isert_cq_desc *)
@@ -689,12 +690,15 @@ isert_disconnected_handler(struct rdma_c
 	return 0;
 }
 
-static void
+static int
 isert_connect_error(struct rdma_cm_id *cma_id)
 {
 	struct isert_conn *isert_conn = cma_id->qp->qp_context;
 
+	isert_conn->conn_cm_id = NULL;
 	isert_put_conn(isert_conn);
+
+	return -1;
 }
 
 static int
@@ -724,7 +728,7 @@ isert_cma_handler(struct rdma_cm_id *cma
 	case RDMA_CM_EVENT_REJECTED:       /* FALLTHRU */
 	case RDMA_CM_EVENT_UNREACHABLE:    /* FALLTHRU */
 	case RDMA_CM_EVENT_CONNECT_ERROR:
-		isert_connect_error(cma_id);
+		ret = isert_connect_error(cma_id);
 		break;
 	default:
 		pr_err("Unhandled RDMA CMA event: %d\n", event->event);


Patches currently in stable-queue which might be from sagig@mellanox.com are

queue-3.10/iser-target-fix-possible-deadlock-in-rdma_cm-connection-error.patch
queue-3.10/iser-target-release-stale-iser-connections.patch
queue-3.10/iscsi-target-convert-iscsi_thread_set-usage-to-kthread.h.patch