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From: Alexander Motin <mav@FreeBSD.org>
Date: Wed, 9 Dec 2009 17:20:10 +0000 (UTC)
To: cvs-src-old@freebsd.org
X-FreeBSD-CVS-Branch: RELENG_8
Subject: cvs commit: src/sys/dev/ata ata-pci.c
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mav         2009-12-09 17:20:10 UTC

  FreeBSD src repository

  Modified files:        (Branch: RELENG_8)
    sys/dev/ata          ata-pci.c 
  Log:
  SVN rev 200297 on 2009-12-09 17:20:10Z by mav
  
  MFC r200121:
  Do not ignore device interrupt if bus mastering is still active. It is
  normal in case of media read error and some ATAPI cases, when transfer size
  is unknown beforehand. PCI ATA BM specification tells that in case of such
  underrun driver should just manually stop DMA engine. DMA engine should
  same time guarantie that all bus mastering transfers completed at the moment
  of driver reads interrupt flag asserted.
  This change fixes interrupt storms and command timeouts in many cases.
  
  PR:             kern/103602, sparc64/121539, kern/133122, kern/139654
  
  Revision   Changes    Path
  1.144.2.4  +1 -2      src/sys/dev/ata/ata-pci.c