Commit e771aae0 authored by Corbin McElhanney's avatar Corbin McElhanney Committed by Alex Deucher
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drm/amd/display: Add comment explaining context free 



This comment explains a previous change that adds some complexity
to the context free in dc:

commit 9ad58779a895 ("drm/amd/display: Fix accessing freed memory")

Signed-off-by: default avatarCorbin McElhanney <corbin.mcelhanney@amd.com>
Reviewed-by: default avatarTony Cheng <Tony.Cheng@amd.com>
Acked-by: default avatarHarry Wentland <Harry.Wentland@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 77a4ea53

drivers/gpu/drm/amd/display/dc/core/dc.c

+9 −0
Original line number Diff line number Diff line
@@ -1740,6 +1740,15 @@ void dc_update_planes_and_stream(struct dc *dc, 
	}



	if (core_dc->current_context != context) {



		/* Since memory free requires elevated IRQL, an interrupt

		 * request is generated by mem free. If this happens

		 * between freeing and reassigning the context, our vsync

		 * interrupt will call into dc and cause a memory

		 * corruption BSOD. Hence, we first reassign the context,

		 * then free the old context.

		 */



		struct validate_context *old = core_dc->current_context;



		core_dc->current_context = context;