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From: Don Lewis <truckman@FreeBSD.org>
Date: Sat, 28 Feb 2004 11:42:49 -0800 (PST)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org,
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X-FreeBSD-CVS-Branch: HEAD
Subject: cvs commit: src/sys/dev/sound/pcm dsp.c
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truckman    2004/02/28 11:42:49 PST

  FreeBSD src repository

  Modified files:
    sys/dev/sound/pcm    dsp.c 
  Log:
  Lock channels only as necessary in dsp_ioctl(), and only lock one
  channel at a time unless it is actually necessary to lock both.
  This avoids problems with lock order reversal and malloc() calls
  with a mutex held when lower level code unlocks a channel, calls malloc(),
  and relocks the channel.  This also avoids the cost of some  unnecessary
  locking and unlocking.
  
  Tested by:      matk
  
  Revision  Changes    Path
  1.74      +173 -65   src/sys/dev/sound/pcm/dsp.c