[bug report] drm/amd/display: Move FPU Guards From DML To DC - Part 1

[Dan Carpenter <error27@gmail.com>]

Hello Rafal Ostrowski,

Commit 3539437f354b ("drm/amd/display: Move FPU Guards From DML To DC
- Part 1") from Feb 24, 2026 (linux-next), leads to the following
Smatch static checker warning:

	drivers/gpu/drm/amd/amdgpu/../display/dc/dml2_0/dml2_wrapper_fpu.c:558 dml2_destroy()
	warn: sleeping in atomic context

drivers/gpu/drm/amd/amdgpu/../display/dc/dml2_0/dml2_wrapper_fpu.c
    551 void dml2_destroy(struct dml2_context *dml2)
    552 {
    553         if (!dml2)
    554                 return;
    555 
    556         if (dml2->architecture == dml2_architecture_21)
    557                 dml21_destroy(dml2);
--> 558         vfree(dml2);

vfree() is a sleeping function (unless we're in an interrupt).

    559 }

drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_state.c   380  static void dc_state_free(struct kref *kref)
   381  {
   382          struct dc_state *state = container_of(kref, struct dc_state, refcount);
   383  
   384          dc_state_destruct(state);
   385  
   386  #ifdef CONFIG_DRM_AMD_DC_FP
   387          DC_FP_START();
                ^^^^^^^^^^^^^
The patch adds this, which disables preemption

   388          dml2_destroy(state->bw_ctx.dml2);
   389          state->bw_ctx.dml2 = 0;
   390  
   391          dml2_destroy(state->bw_ctx.dml2_dc_power_source);
   392          state->bw_ctx.dml2_dc_power_source = 0;
   393          DC_FP_END();
   394  #endif
   395  
   396          kvfree(state);
   397  }


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regards,
dan carpenter