cvs commit: src/sys/dev/usb if_zyd.c

[Weongyo Jeong]

weongyo     2008-09-19 07:40:30 UTC

  FreeBSD src repository

  Modified files:
    sys/dev/usb          if_zyd.c 
  Log:
  SVN rev 183176 on 2008-09-19 07:40:30Z by weongyo
  
  fix a another driver bug related with tsleep() during detaching that
  this also can be happened if we pull the USN stick out forcibly.
  
  Currently the ZyDAS driver uses tsleep() when it try to query a read
  command to the device and it'd make a timeout if the device doesn't
  response within about 1 sec.
  
  In a case of that the USB stick is gone by hand and the driver's
  scanning with changing the channel numbers, the thread which is sleeping
  until a command requested is responded can be waked up after all
  detaching routines finished that means the zyd softc already freed.
  Tring to touch the softc freed by the wakeup thread makes a panic.
  
  So make sure that all sleeping threads should be waken up before the
  detach is completed and any other new requests to the device should be
  prevented.
  
  Revision  Changes    Path
  1.22      +18 -6     src/sys/dev/usb/if_zyd.c