cvs commit: src/sys/dev/esp ncr53c9x.c

[Scott Long]

scottl      2005-04-25 22:11:43 UTC

  FreeBSD src repository

  Modified files:
    sys/dev/esp          ncr53c9x.c 
  Log:
  Apply a torniquet to the problem of the drive unexpectedly disconnecting
  during a data phase.  Before, we would try to recover the autosense, but
  the DMA engine would still be active with interrupted transfer, and we'd
  quickly spiral out of control and cause massive data corruption.  For now,
  just reset the chip and cancel everything.  The better solution is to
  cancel the DMA operation, but there is no clear way to do that right now.
  The data corruption problem is severe enough to warrant this fix in the
  interim.  Thanks to Kris Kenneway to sacrificing countless filesystems to
  this bug.
  
  MFC After: 3 days
  
  Revision  Changes    Path
  1.11      +9 -1      src/sys/dev/esp/ncr53c9x.c