iser_initialize_task_headers() uses in_interrupt() to find out if it is
safe to acquire a mutex.
in_interrupt() is deprecated as it is ill defined and does not provide
what it suggests. Aside of that it covers only parts of the contexts in
which a mutex may not be acquired.
The following callchains exist:
iscsi_queuecommand() *locks* iscsi_session::frwd_lock
-> iscsi_prep_scsi_cmd_pdu()
-> session->tt->init_task() (iscsi_iser_task_init())
-> iser_initialize_task_headers()
-> iscsi_iser_task_xmit() (iscsi_transport::xmit_task)
-> iscsi_iser_task_xmit_unsol_data()
-> iser_send_data_out()
-> iser_initialize_task_headers()
iscsi_data_xmit() *locks* iscsi_session::frwd_lock
-> iscsi_prep_mgmt_task()
-> session->tt->init_task() (iscsi_iser_task_init())
-> iser_initialize_task_headers()
-> iscsi_prep_scsi_cmd_pdu()
-> session->tt->init_task() (iscsi_iser_task_init())
-> iser_initialize_task_headers()
__iscsi_conn_send_pdu() caller has iscsi_session::frwd_lock
-> iscsi_prep_mgmt_task()
-> session->tt->init_task() (iscsi_iser_task_init())
-> iser_initialize_task_headers()
-> session->tt->xmit_task() (
The only callchain that is close to be invoked in preemptible context:
iscsi_xmitworker() worker
-> iscsi_data_xmit()
-> iscsi_xmit_task()
-> conn->session->tt->xmit_task() (iscsi_iser_task_xmit()
In iscsi_iser_task_xmit() there is this check:
if (!task->sc)
return iscsi_iser_mtask_xmit(conn, task);
so it does end up in iser_initialize_task_headers() and
iser_initialize_task_headers() relies on iscsi_task::sc == NULL.
Remove conditional locking of iser_conn::state_mutex because there is no
call chain to do so. Remove the goto label and return early now that there
is no clean up needed.
Link: https://lore.kernel.org/r/20201204174256.62xfcvudndt7oufl@linutronix.de
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Sagi Grimberg <sagi@grimberg.me>
Cc: Max Gurtovoy <maxg@nvidia.com>
Cc: Doug Ledford <dledford@redhat.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: linux-rdma@vger.kernel.org
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
struct iser_device *device = iser_conn->ib_conn.device;
struct iscsi_iser_task *iser_task = task->dd_data;
u64 dma_addr;
- const bool mgmt_task = !task->sc && !in_interrupt();
- int ret = 0;
- if (unlikely(mgmt_task))
- mutex_lock(&iser_conn->state_mutex);
-
- if (unlikely(iser_conn->state != ISER_CONN_UP)) {
- ret = -ENODEV;
- goto out;
- }
+ if (unlikely(iser_conn->state != ISER_CONN_UP))
+ return -ENODEV;
dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc,
ISER_HEADERS_LEN, DMA_TO_DEVICE);
- if (ib_dma_mapping_error(device->ib_device, dma_addr)) {
- ret = -ENOMEM;
- goto out;
- }
+ if (ib_dma_mapping_error(device->ib_device, dma_addr))
+ return -ENOMEM;
tx_desc->inv_wr.next = NULL;
tx_desc->reg_wr.wr.next = NULL;
tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
iser_task->iser_conn = iser_conn;
-out:
- if (unlikely(mgmt_task))
- mutex_unlock(&iser_conn->state_mutex);
- return ret;
+ return 0;
}
/**