[PATCH v2 18/24] drm/msm: dpu: Remove crtc_lock from setup_mixers

Sean Paul
2018-11-16T18:42:28Z

I think the intention here was to protect the enc->crtc access, but
that's insufficient to avoid enc->crtc changing. Fortunately we're
already holding the modeset lock when this is called (from
atomic_check), so remove the crtc_lock and add a modeset lock check.

While we're at it, use the encoder mask from crtc state instead of
legacy pointer.

Changes in v2:
- None

Signed-off-by: Sean Paul <seanpaul@chromium.org>
---
drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 12 +++---------
1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index c49aaf412b6e..141ed1b0e90a 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -474,19 +474,13 @@ static void _dpu_crtc_setup_mixer_for_encoder(

static void _dpu_crtc_setup_mixers(struct drm_crtc *crtc)
{
- struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
struct drm_encoder *enc;

- mutex_lock(&dpu_crtc->crtc_lock);
- /* Check for mixers on all encoders attached to this crtc */
- list_for_each_entry(enc, &crtc->dev->mode_config.encoder_list, head) {
- if (enc->crtc != crtc)
- continue;
+ WARN_ON(!drm_modeset_is_locked(&crtc->mutex));

+ /* Check for mixers on all encoders attached to this crtc */
+ drm_for_each_encoder_mask(enc, crtc->dev, crtc->state->encoder_mask)
_dpu_crtc_setup_mixer_for_encoder(crtc, enc);
- }
-
- mutex_unlock(&dpu_crtc->crtc_lock);
}

static void _dpu_crtc_setup_lm_bounds(struct drm_crtc *crtc,