On Wed, Dec 14, 2016 at 12:08:09AM +0100, Daniel Vetter wrote:
> 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!
>
> Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Reported-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
> ---
> drivers/gpu/drm/drm_connector.c | 18 +++++++++++++-----
> include/drm/drm_connector.h | 12 +++++++++++-
> 2 files changed, 24 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
> index b33334e09b00..0d4728704099 100644
> --- a/drivers/gpu/drm/drm_connector.c
> +++ b/drivers/gpu/drm/drm_connector.c
> @@ -223,6 +223,7 @@ int drm_connector_init(struct drm_device *dev,
>
> INIT_LIST_HEAD(&connector->probed_modes);
> INIT_LIST_HEAD(&connector->modes);
> + mutex_init(&connector->mutex);
There's a mutex_destroy() for drm_connector_free() for that extra bit of
debug icing.
> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> index 0e41a2e184a9..a24559ef8bb7 100644
> --- a/include/drm/drm_connector.h
> +++ b/include/drm/drm_connector.h
> @@ -559,7 +559,6 @@ struct drm_cmdline_mode {
> * @interlace_allowed: can this connector handle interlaced modes?
> * @doublescan_allowed: can this connector handle doublescan?
> * @stereo_allowed: can this connector handle stereo modes?
> - * @registered: is this connector exposed (registered) with userspace?
> * @modes: modes available on this connector (from fill_modes() + user)
> * @status: one of the drm_connector_status enums (connected, not, or unknown)
> * @probed_modes: list of modes derived directly from the display
> @@ -608,6 +607,13 @@ struct drm_connector {
> char *name;
>
> /**
> + * @mutex: Lock for general connector state, but currently only protects
> + * @registered. Most of the connector state is still protected by the
> + * mutex in &drm_mode_config.
> + */
> + struct mutex mutex;
> +
> + /**
> * @index: Compacted connector index, which matches the position inside
> * the mode_config.list for drivers not supporting hot-add/removing. Can
> * be used as an array index. It is invariant over the lifetime of the
> @@ -620,6 +626,10 @@ struct drm_connector {
> bool interlace_allowed;
> bool doublescan_allowed;
> bool stereo_allowed;
> + /**
> + * @registered: Is this connector exposed (registered) with userspace?
> + * Protected by @mutex.
early_unregister, late_register should also be documented as being
called under connector->mutex.
With those minor improvements,
Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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