diff options
Diffstat (limited to 'sys/kern/bus_if.m')
| -rw-r--r-- | sys/kern/bus_if.m | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/sys/kern/bus_if.m b/sys/kern/bus_if.m index c5350beaf9c9..7b8a13501e9b 100644 --- a/sys/kern/bus_if.m +++ b/sys/kern/bus_if.m @@ -247,6 +247,13 @@ METHOD struct resource_list * get_resource_list { # # Is the hardware described by _child still attached to the system? # +# This method should return 0 if the device is not present. It should +# return -1 if it is present. Any errors in determining should be +# returned as a normal errno value. Client drivers are to assume that +# the device is present, even if there is an error determining if it is +# there. Busses are to try to avoid returning errors, but newcard will return +# an error if the device fails to implement this method. +# METHOD int child_present { device_t _dev; device_t _child; |