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IB/iser: Protect tasks cleanup in case IB device was already released

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Bailout in case a task cleanup (iscsi_iser_cleanup_task) is called
after the IB device was removed (DEVICE_REMOVAL CM event).  We also
call iscsi_conn_stop with a lock taken to prevent DEVICE_REMOVAL and
tasks cleanup from racing.

Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Ariel Nahum <arieln@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Sagi Grimberg 2014-10-01 14:02:04 +03:00 committed by Roland Dreier
parent ec370e2b63
commit 3a940daf6f
1 changed files with 7 additions and 1 deletions
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8
drivers/infiniband/ulp/iser/iscsi_iser.c
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@ -293,6 +293,10 @@ static void iscsi_iser_cleanup_task(struct iscsi_task *task)
struct iser_conn *iser_conn = task->conn->dd_data;
struct iser_device *device = iser_conn->ib_conn.device;
/* DEVICE_REMOVAL event might have already released the device */
if (!device)
return;
ib_dma_unmap_single(device->ib_device,
tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);
@ -407,7 +411,6 @@ iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
struct iser_conn *iser_conn = conn->dd_data;
iser_dbg("stopping iscsi_conn: %p, iser_conn: %p\n", conn, iser_conn);
iscsi_conn_stop(cls_conn, flag);
/*
* Userspace may have goofed up and not bound the connection or
@ -415,6 +418,7 @@ iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
*/
if (iser_conn) {
mutex_lock(&iser_conn->state_mutex);
iscsi_conn_stop(cls_conn, flag);
iser_conn_terminate(iser_conn);
/* unbind */
@ -423,6 +427,8 @@ iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
complete(&iser_conn->stop_completion);
mutex_unlock(&iser_conn->state_mutex);
} else {
iscsi_conn_stop(cls_conn, flag);
}
}