drm/nouveau: drop drm_global_mutex before sleeping in submission path

If we keep hold of the mutex here, the process which currently holds the
buffer object will never be able to release it, causing a deadlock.

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

parent e3461a2b

drivers/gpu/drm/nouveau/nouveau_gem.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -337,7 +337,9 @@ validate_init(struct nouveau_channel chan, struct drm_file file_priv,
		return -EINVAL;
		}

		mutex_unlock(&drm_global_mutex);
		ret = ttm_bo_wait_cpu(&nvbo->bo, false);
		mutex_lock(&drm_global_mutex);
		if (ret) {
		NV_ERROR(dev, "fail wait_cpu\n");
		return ret;