On Thu, Apr 6, 2017 at 2:55 PM, Daniel Vetter <daniel.vetter@xxxxxxxx> wrote:
> Legacy drivers insist that we really take all the locks in this path,
> and the harm in doing so is minimal.
>
> Fixes: 2ceb585a956c ("drm: Add explicit acquire ctx handling around ->set_config")
> Cc: Harry Wentland <harry.wentland@xxxxxxx>
> Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
> Cc: Daniel Vetter <daniel.vetter@xxxxxxxxx>
> Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
> Cc: Sean Paul <seanpaul@xxxxxxxxxxxx>
> Cc: David Airlie <airlied@xxxxxxxx>
> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> Cc: Alex Deucher <alexdeucher@xxxxxxxxx>
> Reported-by: Alex Deucher <alexdeucher@xxxxxxxxx>
> Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
Acked-and-tested-by: Alex Deucher <alexander.deucher@xxxxxxx>
> ---
> drivers/gpu/drm/drm_crtc.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
> index d69e180fc563..42257f373c59 100644
> --- a/drivers/gpu/drm/drm_crtc.c
> +++ b/drivers/gpu/drm/drm_crtc.c
> @@ -576,6 +576,7 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data,
> }
> DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);
>
> + mutex_lock(crtc->dev->mode.config.mutex);
> drm_modeset_acquire_init(&ctx, 0);
> retry:
> ret = drm_modeset_lock_all_ctx(crtc->dev, &ctx);
> @@ -721,6 +722,7 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data,
> }
> drm_modeset_drop_locks(&ctx);
> drm_modeset_acquire_fini(&ctx);
> + mutex_unlock(crtc->dev->mode.config.mutex);
>
> return ret;
> }
> --
> 2.11.0
>
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