• Sagi Grimberg's avatar
    nvme-rdma: serialize controller teardown sequences · 5110f402
    Sagi Grimberg authored
    In the timeout handler we may need to complete a request because the
    request that timed out may be an I/O that is a part of a serial sequence
    of controller teardown or initialization. In order to complete the
    request, we need to fence any other context that may compete with us
    and complete the request that is timing out.
    
    In this case, we could have a potential double completion in case
    a hard-irq or a different competing context triggered error recovery
    and is running inflight request cancellation concurrently with the
    timeout handler.
    
    Protect using a ctrl teardown_lock to serialize contexts that may
    complete a cancelled request due to error recovery or a reset.
    Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
    Reviewed-by: default avatarJames Smart <james.smart@broadcom.com>
    Signed-off-by: default avatarSagi Grimberg <sagi@grimberg.me>
    5110f402
rdma.c 63.7 KB