On Wed, Nov 19, 2014 at 06:38:08PM +0100, Daniel Vetter wrote:
[...]
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
[...]
> @@ -304,6 +306,21 @@ drm_atomic_get_connector_state(struct drm_atomic_state
> *state,
>
> index = drm_connector_index(connector);
>
> + /*
> + * Construction of atomic state updates can race with a connector
> + * hot-add which might overflow. In this case flip the table and just
> + * restart the entire ioctl - no one is fast enough to livelock a cpu
> + * with physical hotplug events anyway.
> + *
> + * Note that we only grab the indexes once we have the right lock to
> + * prevent hotplug/unplugging of connectors. So removal is no problem,
> + * at most the array is a bit too large.
> + */
> + if (index >= state->num_connector) {
> + DRM_DEBUG_KMS("Hot-added connector would overflow state array,
> restarting\n");
> + return -EAGAIN;
This function returns a pointer, so this needs to be ERR_PTR(-EAGAIN).
Thierry
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