Patch "RDMA/iser: Fix possible mr leak on device removal event" has been added to the 4.9-stable tree

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

RDMA/iser: Fix possible mr leak on device removal event

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:
rdma-iser-fix-possible-mr-leak-on-device-removal-event.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 <[email protected]> know about it.

From: Sagi Grimberg <[email protected]>
Date: Mon, 27 Feb 2017 20:16:33 +0200
Subject: RDMA/iser: Fix possible mr leak on device removal event

From: Sagi Grimberg <[email protected]>

[ Upstream commit ea174c9573b0e0c8bc1a7a90fe9360ccb7aa9cbb ]

When the rdma device is removed, we must cleanup all the rdma resources within the DEVICE_REMOVAL event handler to let the device teardown gracefully. When this happens with live I/O, some memory regions are occupied. Thus, track them too and dereg all the mr's.

We are safe with mr access by iscsi_iser_cleanup_task.

---
 drivers/infiniband/ulp/iser/iscsi_iser.h |    2 ++
 drivers/infiniband/ulp/iser/iser_verbs.c |    8 +++++---
 2 files changed, 7 insertions(+), 3 deletions(-)

@@ -430,6 +430,7 @@ struct iser_fr_desc {
 	struct list_head		  list;
 	struct iser_reg_resources	  rsc;
 	struct iser_pi_context		 *pi_ctx;
+	struct list_head                  all_list;
 };
 
 /**

@@ -443,6 +444,7 @@ struct iser_fr_pool {
 	struct list_head        list;
 	spinlock_t              lock;
 	int                     size;
+	struct list_head        all_list;
 };
 
 /**

@@ -362,6 +362,7 @@ int iser_alloc_fastreg_pool(struct ib_co
 	int i, ret;
 
 	INIT_LIST_HEAD(&fr_pool->list);
+	INIT_LIST_HEAD(&fr_pool->all_list);
 	spin_lock_init(&fr_pool->lock);
 	fr_pool->size = 0;
 	for (i = 0; i < cmds_max; i++) {

@@ -373,6 +374,7 @@ int iser_alloc_fastreg_pool(struct ib_co
 		}
 
 		list_add_tail(&desc->list, &fr_pool->list);
+		list_add_tail(&desc->all_list, &fr_pool->all_list);
 		fr_pool->size++;
 	}
 

@@ -392,13 +394,13 @@ void iser_free_fastreg_pool(struct ib_co
 	struct iser_fr_desc *desc, *tmp;
 	int i = 0;
 
-	if (list_empty(&fr_pool->list))
+	if (list_empty(&fr_pool->all_list))
 		return;
 
 	iser_info("freeing conn %p fr pool\n", ib_conn);
 
-	list_for_each_entry_safe(desc, tmp, &fr_pool->list, list) {
-		list_del(&desc->list);
+	list_for_each_entry_safe(desc, tmp, &fr_pool->all_list, all_list) {
+		list_del(&desc->all_list);
 		iser_free_reg_res(&desc->rsc);
 		if (desc->pi_ctx)
 			iser_free_pi_ctx(desc->pi_ctx);

Patches currently in stable-queue which might be from [email protected] 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