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

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.

Reported-by: Raju Rangoju <rajur@chelsio.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Sagi Grimberg 2017-02-27 20:16:33 +02:00 committed by Doug Ledford
parent b7363e67b2
commit ea174c9573
2 changed files with 7 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/infiniband/ulp/iser/iscsi_iser.h
View File

@ -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;
};
/**

8
drivers/infiniband/ulp/iser/iser_verbs.c
View File

@ -362,6 +362,7 @@ int iser_alloc_fastreg_pool(struct ib_conn *ib_conn,
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_conn *ib_conn,
}
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_conn *ib_conn)
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);