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    ide: revert "ide: fix drive side 80c cable check, take 2" for now · f68d9320
    Bartlomiej Zolnierkiewicz 提交于
    "ide: fix drive side 80c cable check, take 2" patch from Tejun Heo (commit
    fab59375) fixed 80c bit test (bit13 of word93)
    but we also need to fix master/slave IDENTIFY order (slave device should be
    probed first in order to make it release PDIAG- signal) and we should also
    check for pre-ATA3 slave devices (which may not release PDIAG- signal).
    
    [ Unfortunately the fact that IDE driver doesn't reset devices itself helps
      only a bit as it seems that some BIOS-es reset ATA devices after programming
      the chipset, some BIOS-es can be set to not probe/configure selected devices,
      there may be no BIOS in case of add-on cards etc. ]
    
    Since we are quite late in the release cycle and the required changes will
    affect a lot of systems just revert the fix for now.
    
    [ Please also see libata commit f31f0cc2. ]
    
    Thanks goes out to Fernando Mitio Yamada for reporting the problem
    and patiently testing patches.
    Acked-by: NTejun Heo <htejun@gmail.com>
    Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
    Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>
    f68d9320
ide-iops.c 33.9 KB