• Michael Loehr's avatar
    [SCSI] zfcp: IO stall after deleting and path checker changes after reenabling zfcp devices · 9f28745a
    Michael Loehr authored
    IO stall after deleting and path checker changes after reenabling zfcp device
    
    Setting one zfcp device offline using chccwdev in a multipath
    environment and waiting will lead to IO stall on all paths.
    After setting the zfcp device back online using chccwdev,
    the devices with io stall will have a different path checker.
    Devices corresponding to the deleted units are never freed.
    This has the effect that 'slave_destroy' is never called and zfcp
    still thinks that this unit is registered
    (ZFCP_STATUS_UNIT_REGISTERED is still set). Hence the erp
    routine is not called correctly and the unit is not enabled properly.
    
    Do not delete rport and the sdev. Just set the host to block on
    'offline'. Setting host online again will then remove the blocked status
    and everything is fine again.
    Signed-off-by: default avatarMichael Loehr <mloehr2@linux.vnet.ibm.com>
    Signed-off-by: default avatarSwen Schillig <swen@vnet.ibm.com>
    Signed-off-by: default avatarJames Bottomley <James.Bottomley@SteelEye.com>
    9f28745a
zfcp_scsi.c 24.6 KB