ATA: driver bug: Unable to set devclass

Since one of the recent updates (not sure which revision though) I started to get
"Unable to set devclass" messages in boot dmesg.  I'd say that I see the message
every other boot, i.e. not always.

I added some more debug code there and here's a tack trace:

driver bug: Unable to set devclass (child = 0xffffff00070d0100, devname: (null))
#0 0xffffffff803ae127 at device_probe_child+0x127
#1 0xffffffff803ae40c at device_probe+0x7c
#2 0xffffffff803ae4a1 at device_probe_and_attach+0x11
#3 0xffffffff803ae56a at bus_generic_attach+0x1a
#4 0xffffffff801df93c at ata_identify+0x2ec
#5 0xffffffff801dfcdb at ata_boot_attach+0x6b
#6 0xffffffff803a8577 at run_interrupt_driven_config_hooks+0xf7
#7 0xffffffff803a8993 at boot_run_interrupt_driven_config_hooks+0x23
#8 0xffffffff8032f227 at mi_startup+0xc7
#9 0xffffffff801719cc at btext+0x2c

>From kgdb:
(kgdb) p *(device_t)0xffffff00070d0100
$1 = {ops = 0xffffff0001b07000, link = {tqe_next = 0xffffff0001a65100, tqe_prev =
0xffffff0006eb0130}, devlink = {tqe_next = 0xffffff0001a65100, tqe_prev =
0xffffff000706e318},
  parent = 0xffffff0006eb0100, children = {tqh_first = 0xffffff0001a5b200,
tqh_last = 0xffffff0001a5b208}, driver = 0xffffffff8079bc80, devclass =
0xffffff0001add080, unit = 0,
  nameunit = 0xffffff00070931a0 "ad0", desc = 0xffffff000711e7c0
"ST3320620A/3.AAF", busy = 0, state = DS_ATTACHED, devflags = 0, flags = 89, order
= 0, ivars = 0xffffff000711e5e0,
  softc = 0xffffff000706a400, sysctl_ctx = {tqh_first = 0xffffff000711e600,
tqh_last = 0xffffff000711e708}, sysctl_tree = 0xffffff00070f9500}


Apparently sometimes something happens too soon? :-)

-- 
Andriy Gapon