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From: John Baldwin <jhb@FreeBSD.org>
Date: Mon, 17 Jul 2006 19:45:47 +0000 (UTC)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org
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Cc: 
Subject: cvs commit: src/sys/dev/amr amr.c
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jhb         2006-07-17 19:45:47 UTC

  FreeBSD src repository

  Modified files:
    sys/dev/amr          amr.c 
  Log:
  Chain the bus_dmamap_load() calls when mapping a command with a data CCB
  instead of doing the first load with the BUS_DMA_NOWAIT flag.  On 4.x with
  PAE and > 4gb of RAM this proved disastrous if there weren't enough bounce
  pages as amr_mapcmd() would return failure but the callback would later
  fire once enough bounce pages were available and would then overwrite
  another command's S/G list.
  
  MFC after:      3 days
  Submitted by:   scottl (4.x version)
  Reviewed by:    scottl (port from 4.x to HEAD)
  
  Revision  Changes    Path
  1.79      +42 -24    src/sys/dev/amr/amr.c