• Sebastian Ott's avatar
    [S390] cio: introduce cio_update_schib · cdb912a4
    Sebastian Ott authored
    
    
    There is the chance that we get condition code 0 for a stsch but
    the resulting schib is not vaild. In the current code there are
    2 cases:
    * we do a check for validity of the schib after stsch, but at this
      time we have already stored the invaild schib in the subchannel
      structure. This may lead to problems.
    * we don't do a check for validity, which is not that good either.
    
    The patch addresses both issues by introducing the stsch wrapper
    cio_update_schib which performs stsch on a local schib. This schib
    is only written back to the subchannel if it's valid.
    
    side note: For some functions (chp_events) the return codes are
    different now (-ENXIO vs -ENODEV) but this shouldn't do harm
    since the caller doesn't check for _specific_ errors.
    Signed-off-by: default avatarSebastian Ott <sebott@linux.vnet.ibm.com>
    Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
    cdb912a4
device.c 49.6 KB