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From: Tai-hwa Liang <avatar@FreeBSD.org>
Date: Thu, 17 Mar 2005 13:59:30 +0000 (UTC)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org,
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Subject: cvs commit: src/sys/dev/bfe if_bfe.c
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avatar      2005-03-17 13:59:30 UTC

  FreeBSD src repository

  Modified files:
    sys/dev/bfe          if_bfe.c 
  Log:
  Releasing TX/RX descriptor dmamaps during device detachment instead of
  doing that in bfe_stop().
  
  This should fix a panic recently reported on -current occuring when taking
  device down then up.  In the original implementation, an "ifconfig bfe0 down"
  triggers bfe_stop(), which also destroys all TX/RX descriptor dmamaps. Hence
  the subsequent "ifconfig bfe0 up" would force the device to use those
  already-released dmamap and thus panic the kernel.
  
  PR:             kern/77804
  Submitted by:   Frank Mayhar <frank at exit dot com>
  Reviewed by:    dmlb, sam (mentor)
  Tested by:      Phil <pcasidy at casidy dot com>, myself
  MFC after:      1 week
  
  Revision  Changes    Path
  1.22      +4 -5      src/sys/dev/bfe/if_bfe.c