[PATCH] drm/msm/dpu: check dpu_plane_atomic_print_state() for valid sspp

[Abhinav Kumar]

Similar to the r_pipe sspp protect, add a check to protect
the pipe state prints to avoid NULL ptr dereference for cases when
the state is dumped without a corresponding atomic_check() where the
pipe->sspp is assigned.

Fixes: 31f7148fd370 ("drm/msm/dpu: move pstate->pipe initialization to 
dpu_plane_atomic_check")
Closes: https://gitlab.freedesktop.org/drm/msm/-/issues/67
Signed-off-by: Abhinav Kumar <quic_abhin...@quicinc.com>
---
To: Rob Clark <robdcl...@gmail.com>
To: Dmitry Baryshkov <dmitry.barysh...@linaro.org>
To: Sean Paul <s...@poorly.run>
To: Marijn Suijten <marijn.suij...@somainline.org>
To: David Airlie <airl...@gmail.com>
To: Simona Vetter <sim...@ffwll.ch>
Cc: linux-arm-...@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: freedr...@lists.freedesktop.org
Cc: linux-ker...@vger.kernel.org
Cc: Stephen Boyd <swb...@chromium.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c 
b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
index 
3ffac24333a2a5b01135d4ece418432d4a74dc04..fe3fd9587ec61f241ccb8c28925c7902b92bcdcd
 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
@@ -1333,14 +1333,17 @@ static void dpu_plane_atomic_print_state(struct 
drm_printer *p,
        const struct dpu_sw_pipe *r_pipe = &pstate->r_pipe;
        const struct dpu_sw_pipe_cfg *r_pipe_cfg = &pstate->r_pipe_cfg;
 
-       drm_printf(p, "\tstage=%d\n", pstate->stage);
-
-       drm_printf(p, "\tsspp[0]=%s\n", pipe->sspp->cap->name);
-       drm_printf(p, "\tmultirect_mode[0]=%s\n", 
dpu_get_multirect_mode(pipe->multirect_mode));
-       drm_printf(p, "\tmultirect_index[0]=%s\n",
-                  dpu_get_multirect_index(pipe->multirect_index));
-       drm_printf(p, "\tsrc[0]=" DRM_RECT_FMT "\n", 
DRM_RECT_ARG(&pipe_cfg->src_rect));
-       drm_printf(p, "\tdst[0]=" DRM_RECT_FMT "\n", 
DRM_RECT_ARG(&pipe_cfg->dst_rect));
+       if (pipe->sspp) {
+               drm_printf(p, "\tstage=%d\n", pstate->stage);
+
+               drm_printf(p, "\tsspp[0]=%s\n", pipe->sspp->cap->name);
+               drm_printf(p, "\tmultirect_mode[0]=%s\n",
+                          dpu_get_multirect_mode(pipe->multirect_mode));
+               drm_printf(p, "\tmultirect_index[0]=%s\n",
+                          dpu_get_multirect_index(pipe->multirect_index));
+               drm_printf(p, "\tsrc[0]=" DRM_RECT_FMT "\n", 
DRM_RECT_ARG(&pipe_cfg->src_rect));
+               drm_printf(p, "\tdst[0]=" DRM_RECT_FMT "\n", 
DRM_RECT_ARG(&pipe_cfg->dst_rect));
+       }
 
        if (r_pipe->sspp) {
                drm_printf(p, "\tsspp[1]=%s\n", r_pipe->sspp->cap->name);

---
base-commit: 9d6a414ad31e8eb296cd6f2c1834b2c6994960a0
change-id: 20241209-check-state-before-dump-2a015ace5f49

Best regards,
-- 
Abhinav Kumar <quic_abhin...@quicinc.com>