git: kernel - Add mandatory config hooks delay

Matthew Dillon dillon at
Wed Apr 9 17:03:59 PDT 2014

commit 71ed69eec97cfbadb43d16fcf5aabb827026415d
Author: Matthew Dillon <dillon at>
Date:   Wed Apr 9 16:49:12 2014 -0700

    kernel - Add mandatory config hooks delay
    * Add a mandatory 5-second minimum delay for config hooks.
      This fixes an issue with U4B's very late port probing.  Essentially the
      other disk devices (aka AHCI) can completely finish probing and attaching
      devices before USB even knows there's a stick in a port.  The result is
      that the run_interrupt_driven_config_hooks() routine thinks that all
      disk devices have attached and does not wait at all.
      In addition, usb devices tend to probe near dead last, making the problem
      worse.  The kernel tries to mount the root device the instant after
      the usb pci probe.
    * This is a hack, but to really fix it requires a great deal of surgery in
      the U4B USB stack.

Summary of changes:
 sys/kern/subr_autoconf.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

DragonFly BSD source repository

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