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    IB/srp: Avoid endless SCSI error handling loop · c7c4e7ff
    Bart Van Assche 提交于
    If a SCSI command times out it is passed to the SCSI error
    handler. The SCSI error handler will try to abort the commands that
    timed out.  If aborting fails, a device reset will be attempted.  If
    the device reset also fails a host reset will be attempted.  If the
    host reset also fails the whole procedure will be repeated.
    
    srp_abort() and srp_reset_device() fail for a QP in the error state.
    srp_reset_host() fails after host removal has started.  Hence if the
    SCSI error handler gets invoked after host removal has started and
    with the QP in the error state an endless loop will be triggered.
    
    Modify the SCSI error handling functions in ib_srp as follows:
    - Abort SCSI commands properly even if the QP is in the error state.
    - Make srp_reset_host() reset SCSI requests even after host removal
      has already started or if reconnecting fails.
    Signed-off-by: NBart Van Assche <bvanassche@acm.org>
    Acked-by: NDavid Dillow <dave@thedillows.org>
    Cc: <stable@vger.kernel.org> # 3.8
    Signed-off-by: NRoland Dreier <roland@purestorage.com>
    c7c4e7ff
ib_srp.c 67.3 KB