[PATCH 1/1] drm/amd/display: handle nulled pipe context in DCE110's set_drr()

[tjakobi]

From: Tobias Jakobi <tjak...@math.uni-bielefeld.de>

As set_drr() is called from IRQ context, it can happen that the
pipe context has been nulled by dc_state_destruct().

Apply the same protection here that is already present for
dcn35_set_drr() and dcn10_set_drr(). I.e. fetch the tg pointer
first (to avoid a race with dc_state_destruct()), and then
check the local copy before using it.

Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/3142
Fixes: 06ad7e164256 ("drm/amd/display: Destroy DC context while keeping DML and 
DML2")
Signed-off-by: Tobias Jakobi <tjak...@math.uni-bielefeld.de>
---
 .../amd/display/dc/hwss/dce110/dce110_hwseq.c | 21 ++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/hwss/dce110/dce110_hwseq.c 
b/drivers/gpu/drm/amd/display/dc/hwss/dce110/dce110_hwseq.c
index 0d3ea291eeee..666dfc6d192e 100644
--- a/drivers/gpu/drm/amd/display/dc/hwss/dce110/dce110_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/hwss/dce110/dce110_hwseq.c
@@ -1970,13 +1970,20 @@ static void set_drr(struct pipe_ctx **pipe_ctx,
         * as well.
         */
        for (i = 0; i < num_pipes; i++) {
-               pipe_ctx[i]->stream_res.tg->funcs->set_drr(
-                       pipe_ctx[i]->stream_res.tg, &params);
-
-               if (adjust.v_total_max != 0 && adjust.v_total_min != 0)
-                       
pipe_ctx[i]->stream_res.tg->funcs->set_static_screen_control(
-                                       pipe_ctx[i]->stream_res.tg,
-                                       event_triggers, num_frames);
+               /* dc_state_destruct() might null the stream resources, so 
fetch tg
+                * here first to avoid a race condition. The lifetime of the 
pointee
+                * itself (the timing_generator object) is not a problem here.
+                */
+               struct timing_generator *tg = pipe_ctx[i]->stream_res.tg;
+
+               if ((tg != NULL) && tg->funcs) {
+                       if (tg->funcs->set_drr)
+                               tg->funcs->set_drr(tg, &params);
+                       if (adjust.v_total_max != 0 && adjust.v_total_min != 0)
+                               if (tg->funcs->set_static_screen_control)
+                                       tg->funcs->set_static_screen_control(
+                                               tg, event_triggers, num_frames);
+               }
        }
 }
 
-- 
2.44.2