[Nouveau] [Bug 92307] G98/GM206: WARNING: ... at include/drm/drm_crtc.h:1577 drm_helper_choose_encoder_dpms+0x8a/0x90 [drm_kms_helper]()

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92307

--- Comment #13 from poma <pomidorabelisima at gmail.com> ---
Created attachment 119664
  --> https://bugs.freedesktop.org/attachment.cgi?id=119664&action=edit
dmesg 4.4.0-0.rc0.git9.1.fc24.x86_64 connector_hotplug nvif_notify


- nouveau.ko built of:
http://cgit.freedesktop.org/~darktama/nouveau
git://people.freedesktop.org/~darktama/nouveau

- ending with:
$ git log -1
commit ad38b5e72b3acb40b820954f04293a0161e33845
Author: Ben Skeggs <bskeggs at redhat.com>
Date:   Wed Nov 11 13:06:10 2015 +1000

    WIPce/gk104: attempt at better handling of LAUNCHERR

    Very rough, no idea how correct it is at this point, but it prevents
    getteximage-depth from piglit from hanging the GPU.

    Signed-off-by: Ben Skeggs <bskeggs at redhat.com>

- patched with:
$ git diff
diff --git a/drm/nouveau/nouveau_connector.c b/drm/nouveau/nouveau_connector.c
index 36ec8f3..d6afbb0 100644
--- a/drm/nouveau/nouveau_connector.c
+++ b/drm/nouveau/nouveau_connector.c
@@ -1274,6 +1274,7 @@ nouveau_connector_create(struct drm_device *dev, int
index)
                break;
        }

+       drm_modeset_lock_all(dev);
        ret = nvif_notify_init(&disp->disp, nouveau_connector_hotplug, true,
                               NV04_DISP_NTFY_CONN,
                               &(struct nvif_notify_conn_req_v0) {
@@ -1283,6 +1284,7 @@ nouveau_connector_create(struct drm_device *dev, int
index)
                               sizeof(struct nvif_notify_conn_req_v0),
                               sizeof(struct nvif_notify_conn_rep_v0),
                               &nv_connector->hpd);
+       drm_modeset_unlock_all(dev);
        if (ret)
                connector->polled = DRM_CONNECTOR_POLL_CONNECT;
        else

Ref.
"drm/radeon: Sprinkle drm_modeset_lock_all to appease locking checks"
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/drivers/gpu/drm/radeon/radeon_device.c?id=6adaed5

Conclusion:
In this regard, it does not change anything - with or without ~darktama/nouveau
update, with or without patch.

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