cvs commit: src/sys/kern subr_bus.c

[John Baldwin]

jhb         2006-01-20 21:59:13 UTC

  FreeBSD src repository

  Modified files:
    sys/kern             subr_bus.c 
  Log:
  When loading a driver that is a subclass of another driver don't set the
  devclass's parent pointer if the two drivers share the same devclass.  This
  can happen if the drivers use the same new-bus name.  For example, we
  currently have 3 drivers that use the name "pci": the generic PCI bus
  driver, the ACPI PCI bus driver, and the OpenFirmware PCI bus driver.  If
  the ACPI PCI bus driver was defined as a subclass of the generic PCI bus
  driver, then without this check the "pci" devclass would point to itself
  as its parent and device_probe_child() would spin forever when it
  encountered the first PCI device that did have a matching driver.
  
  Reviewed by:    dfr, imp, new-bus@
  
  Revision  Changes    Path
  1.189     +11 -1     src/sys/kern/subr_bus.c