Module Name: src
Committed By: riastradh
Date: Sat Jun 12 12:14:03 UTC 2021
Modified Files:
src/sys/kern: kern_drvctl.c
Log Message:
drvctl(4): Hold a deviter while issuing config_detach.
Otherwise another concurrent detach -- e.g., from concurrent drvctl
or from USB port disconnection -- can pull the device_t out from
under us.
XXX Need to do this for _every_ operation config_* operation on a
device_t; device_find_by_xname is just fundamentally broken because a
concurrent detach can pull the device_t rug out from under you.
We really need another mechanism for holding a weak reference to a
device, and temporarily getting a strong reference to it; abusing
deviter is a bit of a kludge, and doesn't work very well because it
doesn't properly trigger garbage collection of devices detached while
other concurrent deviters are pending.
To generate a diff of this commit:
cvs rdiff -u -r1.47 -r1.48 src/sys/kern/kern_drvctl.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
