git: bus: Allow subclass to have the same name as the parent cla
commit f4440850c0534454cce73def122ae587c15c9006
Author: Sepherosa Ziehau <sephe@dragonflybsd.org>
Date: Thu Apr 7 18:06:03 2011 +0800
bus: Allow subclass to have the same name as the parent class.
Obtained-from: FreeBSD (Revision 154598 by jhb@freebsd.org)
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.
Summary of changes:
sys/kern/subr_bus.c | 12 +++++++++++-
1 files changed, 11 insertions(+), 1 deletions(-)
http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/f4440850c0534454cce73def122ae587c15c9006
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