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fcf2959da6
linux/drivers/infiniband
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Jack Wang fcf2959da6 RDMA/rtrs-clt: Avoid run destroy_con_cq_qp/create_con_cq_qp in parallel 
It could happen two kworkers race with each other:

        CPU0                             CPU1
    addr_resolver kworker           reconnect kworker
    rtrs_clt_rdma_cm_handler
    rtrs_rdma_addr_resolved
    create_con_cq_qp: s.dev_ref++
    "s.dev_ref is 1"
                                    wait in create_cm fails with TIMEOUT
                                    destroy_con_cq_qp: --s.dev_ref
                                    "s.dev_ref is 0"
                                    destroy_con_cq_qp: sess->s.dev = NULL
     rtrs_cq_qp_create -> create_qp(con, sess->dev->ib_pd...)
    sess->dev is NULL, panic.

To fix the problem using mutex to serialize create_con_cq_qp and
destroy_con_cq_qp.

Fixes: 6a98d71dae ("RDMA/rtrs: client: main functionality")
Link: https://lore.kernel.org/r/20201023074353.21946-4-jinpu.wang@cloud.ionos.com
Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com>
Reviewed-by: Gioh Kim <gi-oh.kim@cloud.ionos.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
2020-10-28 13:17:39 -03:00
..
core RDMA/core: Fix error return in _ib_modify_qp() 2020-10-28 10:32:22 -03:00
hw RDMA/hns: Support owner mode doorbell 2020-10-28 13:13:41 -03:00
sw RDMA/rxe: Compute PSN windows correctly 2020-10-28 10:34:20 -03:00
ulp RDMA/rtrs-clt: Avoid run destroy_con_cq_qp/create_con_cq_qp in parallel 2020-10-28 13:17:39 -03:00
Kconfig IB/core: Improve ODP to use hmm_range_fault() 2020-10-01 16:39:54 -03:00
Makefile treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00