git: drm: reject unload while core teardown is incomplete

[Aaron LI]

commit 2f5596630cfecd3fc10028ada23719da9ac6bf92
Author: David Bidner <david at crap.solutions>
Date:   Fri Oct 2 13:21:52 2026 +0200

    drm: reject unload while core teardown is incomplete
    
    Unloading drm.ko reaches ttm_exit(), which waits for device_released.
    The callback which sets that flag is compiled out and device unregister
    is a stub, so kldunload sleeps indefinitely while holding the linker
    lock. The module event handler has already cleared the Linux task and
    process cleanup callbacks by then.
    
    DRM also retains worker threads and undrained RCU callouts, so removing
    the TTM wait alone would not make unloading safe. Return EBUSY from
    MOD_UNLOAD before changing callbacks or entering SYSUNINIT. Keep the
    module usable until complete teardown is implemented.
    
    Bug: https://bugs.dragonflybsd.org/issues/3443

Summary of changes:
 sys/dev/drm/drm_drv.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/2f5596630cfecd3fc10028ada23719da9ac6bf92


-- 
DragonFly BSD source repository