tree 87f4562db2d38f58c197a974dbd4f493a45e19f3
parent d934fe02ba176b5e88d8b67d603cd94fc930f3ce
author Daniel Vetter <daniel.vetter@ffwll.ch> 1482068145 +0100
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1497674513 +0200

drm: prevent double-(un)registration for connectors


[ Upstream commit e73ab00e9a0f1731f34d0620a9c55f5c30c4ad4e ]

If we're unlucky then the registration from a hotplugged connector
might race with the final registration step on driver load. And since
MST topology discover is asynchronous that's even somewhat likely.

v2: Also update the kerneldoc for @registered!

v3: Review from Chris:
- Improve kerneldoc for late_register/early_unregister callbacks.
- Use mutex_destroy.

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Reported-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161218133545.2106-1-daniel.vetter@ffwll.ch
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>