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From: Alexander Motin <mav@FreeBSD.org>
Date: Fri, 29 Jul 2011 20:35:23 +0000 (UTC)
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Subject: cvs commit: src/sys/dev/ahci ahci.c ahci.h
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mav         2011-07-29 20:35:23 UTC

  FreeBSD src repository

  Modified files:
    sys/dev/ahci         ahci.c ahci.h 
  Log:
  SVN rev 224498 on 2011-07-29 20:35:23Z by mav
  
  In some cases, at least on Marvell 88SE912x controllers, Current Command
  Slot field of the PxCMD register may point to an empty command slot.
  That breaks command timeout detection logic, making impossible to find
  what command actually caused timeout, and leading to infinite wait.
  Workaround that by checking whether pointed command slot is really used
  and can timeout in its time. And if not, fallback to the dumb algorithm
  used with FBS -- let all commands to time out and then fail all of them.
  
  Approved by:    re (kib)
  MFC after:      1 week
  
  Revision  Changes    Path
  1.72      +14 -6     src/sys/dev/ahci/ahci.c
  1.19      +1 -0      src/sys/dev/ahci/ahci.h